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>> Home > Tags > run time

run time
maritime museum
bountiful b 377
run time
Denatured Alcohol by Dave M Fleet Admiral!   Posted: 18 hours ago
Hi Chris Always happy to share my experiences. Epoxy is basically a glue and whilst the aero boys like to use it with glass cloth to cover their wings because it bonds well to the wood and remains slightly flexible, my experience is it is dear, adds significantly to the weight, is difficult to apply evenly and has a nasty habit of running after application. We used on the large liners, having also seen the hype on U-Tube, and really struggled with the application. If I was using this as a sealing coat with or without cloth then I prefer Polyester lay up resin which is cheaper, thin and easy to apply, has controllable setting time and produces a much harder finish. Good luck with the registration, not sure I would want to get that close to HM Customs & Excise! Happy building Dave

Jet Sprint Boat by Rod Commander   Posted: 6 days ago
Hi Wayne Can't have that lol Fitted engine and currently wiring up all the controls Has taken a bit longer than I thought because of my other projects like finishing Sovereign of the Seas and preparing RC Beaver for flight oh and trying to get a bit of oil painting finished off Who says retirement is boring lol I just keep running out of time not enough hours in the day We have a national model boat show on over labour weekend in October so I hope to have the jet finished by then but have to do some R and M on the Corvette and Amara tug steam engines before then as well Have posted latest pictures Cheers

As of Summer 2017... by Jerry Todd Commander   Posted: 18 days ago
After the sail, I added some hardware to the spars, namely jackstays. I also ordered some aircraft plywood and used it to make new winch drums. These are sized to my current plan of only bracing the tops'l yards. Hopefully, this is the last set I'll have to make. Seeing into the dark interior of the hull can be a pain, more so the brighter it is outside. Mark got some red LEDs to light up the dash of his old pick-up (ute for my Assie friends) and gave me a left-over section. It requires a 12 volt supply (I'm running 6) and red doesn't really help in daylight, but I like the idea. If I can find a white LED strip that'll run on 6 volts, this will definitely get put in. The stern also had folding bulwarks like the bow, but that wrapped all the way around. On the real ship these were replace with a fixed bulwark except for a couple of panels that allowed access to the stern boat. By the time the ship came to Baltimore in 1955, these too were gone, with all their hardware. Again, I'm not making them functional, and decided to built these on the model rather than as separate pieces like on the bow. The hinges are represented inboard by card stock and brass eyes. The barrel portion of the hinges outboard at the bottom of each panel will be a little section of 1/16" wood dowel. The forward bulwarks were epoxied in place and the support rods were installed all around. The tops are raw because they all get a bright cap rail (varnished natural wood) and I'll put that on when it won't get messed up with paint or glue. A friend sent me a box of stuff, among which was a nive little cat face perfect for my catheads. Only having one, I was going to cast a pair in resin. But I'm out of casting resin and epoxy glue didn't set up in a way I liked, so we'll come back to that. The tops'l yards on the ship are hinged iron bands, line with wood staves. I wanted to replicate that functionality not only because that's what the ship has, but because it would allow me to take them off the mast without unrigging half the ship. I cut some heavy copper I use for everything and bent it into two half circles; soldiered brass tubing to the ends, and sawed out the notches with a jewelers saw. If only it had been that easy. Soldiering here tended to un-soldier there, cold soldier joints wouldn't hold. I gave up in frustration. I changed the gun carriages based on some research I did, but I'll post separate entries dealing with them and the ship's boats. I went looking for information on soldiering little things, and took another whack at the parrels. This time it worked out much better. I reused the copper band and brass tubing for the main and made the fore the same way. I still have to make the mizzen tops'l yard parrel, but my soldiering has gotten much much better. Last May ('17) I took the boat to the Baltimore Port Expo for National Maritime Day again, surrounded by members of our newly formed White Rocks Model Boat Club. I didn't manage to get her controls set-up in time, so she didn't go in the pool, but sat on her cart and looked pretty. I put her courses and trys'ls on her for this. The trys'ls won't be used when she sails, but can be set for static displays. The courses will get used, but I'll be able to buntl them up as shown to reduce sail. Also to reduce sail, the t'gallants and royals will be easily removable, or replaceable, as the case may be, depending on what wind there is. That pretty much brings us up to date as of July 2017. I'll post something about the boats and guns in a bit, as well as any other progress that's made. There's far more detail, images, and notes at my website on this, and the other models I'm working on at: There's a few items I skimmed, or skipped over, like her signal flags, that are covered in detail there; like the day she was almost dismasted by the garage door.

Working radar by Dave M Fleet Admiral!   Posted: 24 days ago
Hi chugalone100 It would appear you have already worked out that some sort of pulley may be an option. Angled small gears may also work but there may not be the space available and you would probably need to make your own. I did buy from some very small (6mm) planetary geared motors that run on 3volts and are certainly suitable for your purpose via a pulley system. Using 1.5 volts gave a very realistic speed. Using one of these motors should allow you to use two small pulleys on the mast, where I suspect space will be limited. I would make sure you will always have access to the pulleys and belts as they will almost certainly need servicing over time. Hope this helps and please post details of the setup. Dave

No power by Dave M Fleet Admiral!   Posted: 25 days ago
Hi Nick Your ESC needs setting to the TX/RX. It is very important that before you switch on the Tx all the sticks and trims are at neutral and set for normal as against reverse. Switch on the Tx plug the Esc with battery connected into the Rx ESC socket. Switch on the ESC, both leds flash red green. Whilst they are flashing push the small button on the ESC. The green light should illuminate, push the relevant TX stick fully up, the red led should illuminate, pull the stick fully down and then return it to neutral. Both red and green LEDs should be lit whilst the stick is in the neutral position. Pushing the stick up fully will light the green LED (forward) fully the other way the red LED will light (reverse). The motor will run if connected. Your ESC is now set up to work with this Tx/Rx combination and will retain the setting each time you switch on. Always centre your sticks before switching on to avoid the motor starting due to a non central position. Different Tx/Rx combinations may require you to repeat the procedure. The same procedure should work for all Mtronic ESCs with a button including your two. Dave

Building a deck by Jerry Todd Commander   Posted: 26 days ago
I began laying the deck on April 5th. It had snowed as recently as the week before, but it finally warmed up enough to use glue. The strips were cut to 6-5/8" length, about 20' in 1:36 scale. I used a black marker on two opposite sides to represent the pitch in the seams. The deck was laid in a 5-plank pattern to mix up the butt-joints as much as I could. My research on her decking found she's had various styles and plank widths over her life. The earliest photo showing her deck that I could find, showed it straight planked with 7 or 8" wide boards based on the number of planks between her waterway and the main hatch coaming. Her waterway logs seem to be placed ON the decking, as there's no margin planks or joggling - even today. The planking was set with gel CA. Gorilla sells it in a nice bottle with a metal pin in the cap to keep the spout open. It would up taking 3 of these bottles to complete the deck. The planks are cut at a 45 on the ends along the fore and aft access hatches, to try and hide this seam as much as possible. Once the deck was down, I scraped it. The glue is more resistant than the basswood is, so sanding would have scalloped the wood between seams. Scraping makes everything level. Some lite sanding, more to polish than remove anything, was done last. I had planned to stain the deck a very light grayish tint, but an active naval vessel gets holy-stoned regularly and wouldn't be gray as the ships that sit at a dock today are. In all it took 455 pieces to complete the deck and there wasn't any scrap longer than 1 inch left over. In all I have 3/4" deck beams, 1/4" plywood, a layer of 4oz cloth and resin, and a 3/16" basswood deck - I don't recall why I designed it so heavy, but it certainly doesn't hurt the model at all, and I think the 3/16" square strip will prove to have been easier to set than the 1/16" x 1/4" planks Pride and Macedonian will get. The deck go a coat of water-based satin poly, and I stared working on hatch coamings, cap log, and waterways. The cabin skylight and two hatched forward of it, including the capstan, and all combined into one hatch where the battery is accessed, and which hides the aft ballast rod and main power switch. The cap logs Are 1/2" wide x 1/4" tall basswood that was tren'led, glued, and copper nailed, onto the deck, flush with the outside of the hull covering this seam completely. The the angled wood waterways were installed around the inside of the cap log, and the deck got a coat of oil-based satin poly. This actually leeched in and made the marker seams bleed a little. In hind sight, I think I'll go with paint over marker for seams in the future. The coamings got painted black. I'm not sure why the Navy painted deck fittings black. It was even common to paint to top surfaces of tops black. I wonder how many injuries and losses this cost the navy that white paint would have prevented. Anyway... Constellation didn't have "solid" bulwarks, but rather she had hammock irons bolted to her cap log. These were removed when Baltimore tried to pass her off as a frigate and tossed in the bilge. When the ship was restored as a sloop of war, they found all but one. These irons are designed to have wooden rails at their tops, inboard and out, and have holes so several lines can be run through them. The Navy in it's wisdom though, decided to wainscot them to appear as solid bulwarks, despite the additional splinter hazard that would be in battle. I wasn't making all those metal stanchions just to hide them under wood and tarps, so I made wood blocks sheathed in sheet bass, scribed to look like vertical wainscotting. It was the end of April by now, and the Baltimore Port Expo was in two weeks. I wanted to have hammocks in the bulwarks, as she appears in the portrait, but there was no time to figure this out, so I layered on some balsa and shaped it so it looked like tarps were laid over the hammocks. When I figure out how I'll represent the stowed hammocks, I can pull the balsa off easily enough. The bulwarks on, I made some fittings for the spencer masts; installed the eye bolts at the base of the masts; made some bollards (or whatever name they gave those posts), made and installed the catheads, which are laminated 1/16" basswood. I then started setting up a jury rig and her controls so she could sail at the Port Expo. I set her t'gallants and all three heads'ls this time around. By the night before the Expo, she was ready to go.

Soldering practice ahead of making railings ! by Dave M Fleet Admiral!   Posted: 30 days ago
You should get good results with that iron. Not sure what type of solder you used but the resin cored works well. My local pound shop sells a paste flux in a small tub and this will help the solder run into and around the joint. If you are making adjacent joints with that iron you may need to use damp cloths to stop the heat breaking the already soldered joints. I sometimes use a big piece of copper that I clamp over the parts needing protection. You clearly have mastered the process right from the start and are to be congratulated Dave

Fairy Huntsman by Dave M Fleet Admiral!   Posted: 1 month ago
As this is a refurbishment chances are it was fitted with an IC engine in which case you need to remove all the gunge and heavy mounting blocks from inside the hull as well as checking the propshaft and bearings. If you can get the weight reduced then I would expect a speed 600 motor with a 30 to 40 mm prop should suffice. A 20/25 watt ESC powered by a NiMh would also be suitable and keep the weight down. If you use racing props the current will be greater than if you use brass 3 blade props, and the bigger the prop the greater the current. As a general rule the prop should have a diameter of no greater than that of the motor. The voltage of the NiMh must not exceed the max voltage the ESC can handle. A higher voltage will reduce the current draw so a 9.6v may be better than a 7.2v and give a longer run time. If you already have batteries for other models I would use those but SLA's are heavy and may hinder planing. If you already use LiPos then make sure your ESC can stand the voltage and has a built in cut off to protect the battery.

Jet Sprint Boat by Rod Commander   Posted: 1 month ago
Hi Wayne This boat is being made for going up river rapids through boulders etc so it will be getting somewhat knocked around so I would be happy if it only receives a few scratches lol I take you point though but I havn't purchased the running gear yet Can't quite make my mind up on battery power or petrol engine I've got a bit of time yet to make a decision Cheers Rod

Sea Hornet by RNinMunich Fleet Admiral!   Posted: 1 month ago
That's exactly how my HMS Hotspur destroyer started! 👍 Free running with two rattly Mabuchis and a flat 4.5V dry cell battery! Granny and Grandad took pity and bought me a 6V 'Lantern' battery! Progress 😊 The Sea Scout my Dad built (which I'm now renovating) was very modern .. Taycol Target and 6V wet accumulator! And yes, that kit cost 35 bob, substantial chunk of a week's wages! Oh happy days .. Or ... !? Both had to wait another 20 years until I could afford RC, an Irvine / Sanwa Conquest FM6, sitting on my desk now (wonder where the antenna went?), it still works! 35Mhz!! Well what did I know?? 🤔 Anyway, my excuse is I originally bought it for the little Wren biplane I had built for my daughter, a German kit called Zaunkönig in German - literally 'Fence King'. Still have the plane, thinking of converting it from glow-plug to brushless. Micro servos and LiPos already purchased 😉 DHL just promised me that tomorrow the rest of the bits for the Sea Scout refit will arrive, including Royal Blue paint. 😊 So much to do - so little time 🤔 Happy building and happier sailing. Cheers Doug 😎

Motor suppression by colinhubbard Fleet Admiral!   Posted: 1 month ago
Hi guys, after reading all your advice including muddy's pm. I've fitted the suppressors and earthed the motor can to shaft tube, then run the motor for 6 hours starting on 1.5 volts And working up by 1.5 volts every 20 minutes, plus running in reverse at each voltage step. Finally up to 12volts. No arcing and no interference. But while doing this I found another problem, the prop shaft was bent, it took about half an hour to true it up, now super quiet. I used Mitchell Marine Grease in the shaft tube. (Available at all good fishing tackle shops). Tomorrow I will try to do a load test in water if my grandsons paddling pool will take it as I want to know the run time on my SLA and gell batteries. Well that's it for tonight I'm pooped. Good night. Colin.

Which Cable To Use by RNinMunich Fleet Admiral!   Posted: 1 month ago
OK. Then you mean in parallel to double the capacity and therefore run time. Then you have to always make sure that both batteries are the same type, same age and same charge level! Otherwise the stronger one will always be charging the weaker one until they are both at the same state! I can still only point to my previous advice, have a look at the link to 'Electrical related', cos I don't know how much current you want to stuff through the cables. In the same forum you will also find some guidelines for fuses to protect; cables, motors, ESCs, other expensive equipment! For the record tandem to me means one behind the other like the bike! 😉 I.e. in series! Good luck, Doug 😎

What battery do you choose? by RNinMunich Fleet Admiral!   Posted: 2 months ago
Strangely no one has answered an important part of your original question !? 🤔 How to calculate running time! Simply put; divide the capacity of the battery in amp-hours (AH) by the current in amps (A) drawn by the load. AH/A = H !! Step 1; measure the max current drawn A(max) by the motor under load; i.e. full speed ahead in water - hang on tight!. If not possible then use the max current data of the motor at the voltage you intend to use. Step 2; check the capacity of your battery; usually given in mAH for some peculiar reason! Divide by 1000 to get AH. Divide the capacity in AH by the max current in A =A(max). Result is the theoretical time that the fully charged battery can deliver the current required; i.e. runtime at full speed. Theoretical because in practise the usable capacity will be a bit less than nominal depending on the age and condition of the battery, ambient temperature etc. Also you won't want to completely discharge the battery; it won't like it 😡 Step 3; measure current at a mid-range throttle setting 'cruising' - A(cruise). Again divide capacity AH by A(cruise). result is 'cruising time in hours. If measuring not possible use the motor current data given at maximum efficiency. Should give a reasonable approximation. Example: motor current at full speed = 10A. Battery capacity 7000mAH = 7AH. Max theoretical runtime at full speed = 7/10Hr. Approx 42 minutes. Cruising current; 5A. Cruising time = 7/5Hr = 1.4Hr. Approx. 84 minutes. Use the highest capacity batt. you can get in without upsetting stability etc.! If you need ballast use a bigger battery; then you have 'payload ballast' instead of JUST ballast. Minimise current drain by; ensuring drive train is perfectly inline, well lubricated, prop is as small as possible for the desired performance (trial and error!). Hope this lot helps, not space science but a few basic rules! 😉 Happy sailing and lots o' fun. Cheers Doug 😎

Huge liner model from 1929 by wunwinglo Petty Officer   Posted: 2 months ago
I often visit the British Pathe site, which has an archive of over 60,000 film clips covering an infinite range of subjects, going back to the beginning of the 20th century. I have wasted many hours looking at it. However, if you visit the site and punch in Miniature Mariners, (, you will find an interesting selection from 1929, that includes the still extant Victoria Park Club running a hydroplane with a huge audience. The clips finish with a truly awesome liner model of about 40 feet length and apparently sea-going. The information board ( it was a silent film in 1929) tells us very little: it is French and 40 foot long. I know that it is a long time ago and French but do any other sailors know more about this?

a very noisy fireboat by pmdevlin Fleet Admiral!   Posted: 2 months ago
its early on with this project, I was going to wait until its completed, but not sure when that will be, so Ill give you a sneak peak. I've been using a sound system in one of my model planes, and over time have become friendly with the guy who makes them, helping him with various things. I got thinking about the 4 foot fireboat I have, and how cool it would be to have a sound unit. So, to cut a long story short, I knew he had a plane sound with twin Merlin's for a bomber, and I use a merlin for my P51 Mustang model. After a serious amount of pestering, I got him to modify one of the 5 stock sounds on his Boat sound unit, using the twin Merlin sound from the planes. It took some work, getting rid of the propeller sound on the start up and shut down sequence. I ran it for the first time last night, but forgot to take spare batteries, and a small screwdriver to adjust the settings, so couldnt change the settings, in particular, the volume was set way too loud, losing some of the clarity of sound. This is pretty close to the real engines, which where v8 meteor, this sound is an actual recording of the v12 Merlin, its doubled up, and staggered, so you can hear the two engines running. It has start up and shut down sequence, it isn't clever enough to read reverse unfortunately. Its a speakerless system, using transducers instead of speakers, which are much louder, smaller and lighter. They rely on vibrations, they are epoxied to the hull, and the whole boat becomes the speaker! Its the first time I've done this, and its pretty new on the market for boats, planes have been going for a few years. I've realised that whilst I put them above the waterline, I didn't account for the roll of the hull, when one (there is one on either side) goes below the waterline it muffles the vibrations, and causes a funny sort of gurgling noise, ah well, like I say, its early days! Still a bit of tweaking to do, but you get the idea. Stock sounds are Turbo cat diesel, Johnson outboard, evenrude outboard, mercule v8, steam. They also have aux sounds, such as ships bell, steam whistle, horn, seagulls etc. I think on my system the Johnson is dropped in lieu of the twin merlin sound. Have a look at