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>> Home > Tags > run time

run time
maritime museum
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run time
Tarpon hardware help by RNinMunich Fleet Admiral!   Posted: 2 days ago
Hi Gordon, "the boat is to be a present for my son. He works abroad for long periods and I reckon a lead acid would go flat beyond recovery." In that case an SLA (especially the types produced to power alarm and emergency lighting systems) would be your best bet. They can be left on trickle charge indefinitely. Two 6V in series might be better than one 12V to help with trimming out the boat. I use a pair of 6V 3Ah (about 600gm each) in my 135cm destroyer and 107cm submarine. They run for hours if I don't keep the pedal to the metal all the time. 😉 Back home I stick 'em on the trickle charger and leave 'em until the next outing. They've lasted my several years so far. Much longer than my NiMhs. An NiMh looses approx 1% of it's charge per day. So, assuming it starts fully charged, in 3 months or less it would be in Deep Discharge and have joined the Dodos😭 Cheers, Doug 😎

All hooked up, nowt happens... by RNinMunich Fleet Admiral!   Posted: 3 days ago
Sounds good to me Selwyn 👍 That board is a sensible (essential) idea in that setup. Stops a stronger battery trying to charge the weaker one.👍 I have several Action Electronics modules as well (duplicated some 😁) They're good, well made stuff. Anyway, your brushless ESCs will 'see' 12V so setting them up as running on NiMh should do the trick. If you set them up as 'LiPo' they might think it is a 3S 11.1V battery and try to let the volts go down to 9V before cutting off!! Not good for the SLAs 😡 IF they assume it is a 4S 14.8V Lipo they will cut off at 4x3.0 i.e. 12V which will drastically shorten your run time; you'd have to keep the SLAs near fully charged (13.6V) all the time. Bon chance mon ami, let us know how it goes. All the best, Doug 😎

A return to the hobby! by Colin H. Fleet Admiral!   Posted: 8 days ago
I also tend to use Sla batteries a model this size should easily be able to take a 12v 7ah battery, some of my models I have to use 2 batteries, 1for ballast or in parallel to give longer running time. The 660 motor should be fine, what size prop are you going to use. Cheers Colin.

BRAVE BORDERER - BRUSHLESS SUMMARY by jbkiwi Sub-Lieutenant   Posted: 15 days ago
I used this pump from E Bay which pumps well, and with the rubber mounts is quiet. 6-12v (I use a 2 cell LiPo which seems perfect) and am cooling 2 2000kv 28mm in-runners. Have tried a few different pumps and these have been the best so far. You have to be careful that you don't over pressurize your plumbing system, as if the hoses come off while running you can fill your boat up in no time. It's safest to adjust your pump voltage or piping to a 'neutral' pressure rather than risk hosing down your electrics. I used twin pick-ups behind the props and separate feeds, one for the pump and one direct in case the pump stopped or blocked.

Brushless motors (again) by steve-d Lieutenant   Posted: 23 days ago
Again, as not wanting to nick someone else's thread. Huntsman 31 currently has a geared (belt) brushed motor which was probably quite a good spec. many years ago. I don't remember how quick it was but having watched brushless boats running this morning in Southsea I have decided now is the time for change before I start painting. I've been reading various threads and gleaned some info but it is still a minefield. Whilst this boat (original) is twin screw I am not yet ready to go that far so will stay single screw. A thread suggested 3639 -1100KV which is fine as a spec. but there are a zillion different makes and models for that spec. Cornwall models seem to offer 6 or 8 so I am looking for more specific advise for make and model of each piece of the power system...motor, ESC, battery, charger. I'm not going to say 'money no object' just that I don't 'need' to buy bottom spec. I suspect there will be as many different suggestions as 'Cornwall' have motor makes but something good will come out of it. Many thanks Steve

Spraying Again....... by RNinMunich Fleet Admiral!   Posted: 24 days ago
Mornin' Neville, ."How wet is wet"? Hold the paper under a running tap, warm water, until it goes dark all over. Remove excess water with kitchen roll. You don't have to flood the hull but keep the paper well wetted. For convenience I use the Tamiya sanding sponges. They mould themselves to any shape they are used on which is great for compound curves. Keep a bowl of warm water handy to re-wet the paper or sponge from time to time and to clean of the residue that builds up on the paper. Also regularly wipe off the slurry that builds up on the object you are sanding with kitchen roll or a damp flat dense kitchen sponge. When you are finished wash off the hull (or whatever) with the the flat sponge and clean water. Dry off carefully with kitchen roll or non-linting cloth. DON'T do a bath test with just primer on the hull as the primer is porous! It consists mostly of finely ground chalk dust or similar in a solvent suspension. Wait until you have at least the first top coat on to seal it. You only have to look at a car with a primed wing, that has then been driven around in typical British weather for a few weeks, to see why!! Don't forget the 'secret ingredient' 😉 All the best, Doug 😎 PS Nearly forgot 😲 Start using a few drops of liquid soap on the w&d from the final preparation of the primer coat through til the end.

RC....mixers? And other unknowns.. by BW3 Chief Petty Officer   Posted: 1 month ago
Ok... Currently trying to build a Itaieri Schnellboot, ...but am questioning if what little I think I know to be correct/ workable... I have amassed the following : 3- Hobbyking ST3007 1100KV brushless motors each direct drive to 32mm plastic props.... (2 right hand drive and 1 left hand drive props... swapped over leads on on motor to get it to run as yet untested the left hand prop) 3- Turnigy nano tech 3s 3000mh 25-50C Lipo ( Have got a balance charger and board , flame proof charge bag , battery voltage check/ alarm units, and will check and charge them await the only local help I have in RC / lips battery a helicopter flyer who has no experience with RC boats ) I just read the post on WTail mixer and wonder if I need that or if my current unkowning idea to just connect all 3 ESC ‘s together to one channel on the radio , again was give Eflite Blade SR HP6DSM 2.4GHz to try out ,Will this unit work or do I need something else , currently will/ can use all 6 channels but would / could use more if I had them ... last time I had anything to do with RC was a a kid/ teen and back then you had ground radios and flight radios and the two should not be mixed .. Ok please advise , how far off am I or am I still within range of keeping it simple ? Thanks All Bill

Old outboard motor... by RNinMunich Fleet Admiral!   Posted: 1 month ago
Believe that was the dog's dilemma as well! 😁 Since my little inflatable is only about 10 to 12", and was originally a free running toy, it's not worth that much for an outboard. I'll just see if I can soup up the original motor a little. It has has a blow up valve, like beach balls huff huff huff - collapse, so I was thinking of filling it with something like building foam, as used for cavity filling etc, and putting an alu plate in the floor for stiffening and to carry the necessaries, disguised under driver's console and equipment boxes & benches. Pics of your dinghy? Time to test the new camera? Cheers, Doug 😎

Rudders and Propellers by teejay Commander   Posted: 1 month ago
Hi all for the second blog report on the schnellboot I am going to go over the rudder a propeller shaft assembly in more detail. The first stage was to make the rudders which were made of brass ,and having taken note of what has been said about the increase in size needed for the kit by other members I have increased the size of the rudders by 50% so that they have more effect and hopefully the boat will be more agile .I fitted 3mm treaded rod on to the rudder and in a 4mm flanged tube to reinforce the brass rod. The second stage was to make and fit 5mm flanged tube in the location for the rudders in the boat, these were made to be above the water line and will be sealed in place to reduce the possibility of leaks. These were fitted to a rudder platform inside the boat which was fitted to the kit moulding for the rubbing strip that runs the length on the boat and secured by making resin blocks which were fitted with computer extension nuts. which were then superglue in place to secure the rudder platform. The rudders were then fitted in place and held in position with the tiller collars which were made from 8mm rod and fitted the tiller arms and locked in place with 3mm computer screws and ni-lock nuts, a connecting plate was then fitted to connect the three tillers together, I also fitted rubberised washers to seal the rudder tubes. The third stage was to make the propeller supports. The centre support was a direct copy of the kit part made of brass and fitted to the kit with a plate and screws (this plate and the rudder plate were made from galvanised steel) and will sealed with resin after the I test the boat for leaks. The port and starboard supports were made by taking the kit parts and cutting them in have along the joint line or mould seam this gave me a template ,which I used to make cross-section segments but I did alter the template by increasing the boss diameter to 10mm and extending the support legs so that the finished support could be fitted through the hull (the picture of these show the mk1 version where I forgot to allow for the 4mm prop shaft which has a 6mm tube) any way the boss of these segments were drilled out with a 7mm drill and a length of 7mm brass tube fitted through the boss to assemble the segments, all of which were coated in soldering flux at this stage of the assembly which were riveted at both ends to hold it all together during soldering, after soldering the supports were then filed to the size and shape to resemble the kit parts as close as possible and fitted to the hull using a superglue and talcum powder mix and then I cast resin around the extensions to secure the prop supports in place. The fourth stage is the propeller shaft housing for the centre propeller housing I place a brass rod in a plastic straw and place in position in hull and using resin I sealed the hull with the rod in place this gave me a pilot hole for the centre prop shaft after I removed the brass rod. For the port and starboard shafts I used the kit parts which had hole place when assembled, this when I reinforced the housings ,the centre housing I glue 2mm of plasticard on each side and for the port and starboard I made a brass tube shroud which covered the housings which left gaps between the kit part and the brass which was filled by casting resin in the gap this increased the diameter to 10 mm so that there were little chance of breaking throw with the drill and finished these off by fill-in the outside with body filler and sanded to shape and finish . I then drilled through the pilot hole in the housings using very long extended drills and a wheel brace ( if I had use a power drill the heat would have melted the plastic of the kit and may have caused problems) I drill the shaft housings out 6mm them filed them out with 6mm file so that I could insert a length of 6mm brass tube. After all this was done I fitted a flanged bush made from 7mm tube and 2mm brass plate turned to 11mm to the ends or the propeller shaft housings. And now it is time I must ask for some help could anyone advise me on the length of propeller shafts, I know I can use a 300mm shaft for the centre shaft, but port and starboard will have to be longer. and I also need advice on selecting the motors, I want to use 4mm prop shaft with 35mm propellers. Any opinions welcome.

Kingsmere Model Boat Club by BOATSHED Fleet Admiral!   Posted: 1 month ago
I do know there is a large pond in Norwich in Eaton Park and you can run any type of boat on that pond. If I ever win the lottery big time then I will buy somewhere in Norfolk with a couple of acres of land and have an enormous lake built so I can play boats when ever I want. Also have a small boat moored so when it runs out of fuel or for any other reason cuts out then I could recover it easily.

Kingsmere Model Boat Club by Ray Sub-Lieutenant   Posted: 1 month ago
When ever I went to watch the competitions straight running,it never seemed noisy to me ,and the pond was not particularly near to housing,and the large properties around there seem to have large gardens and you can bet a few of them will be merrily motor mowing ,strimming or leaf blowing on a Sunday afternoon.Sadly now the pond is a shadow of what it was a the edges all over grown and it seems to have shrunk in size the last time I looked at it .

Anteo 2 Tug by Colin H. Fleet Admiral!   Posted: 1 month ago
Hi Dick, I have a few tugs and the largest at 49" uses a geared 540 running from a 12v 7ah sla battery giving a good 90mins running time. This model weighs in at 15 kilos ready to sail. I also have a caldercraft model tug Joffre. Which is about 30" long and runs using a 6v monoperm motor and gearbox. 6v 4.5ah sla battery giving about 1 hour run time. Weight is 5kilos ready to sail. Hope this helps. Cheers Colin.

Kingsmere Model Boat Club by Ray Sub-Lieutenant   Posted: 2 months ago
Sorry no photos ,but I remember back in the late 60's early 70's spending some enjoyable Sunday afternoons sitting by the pond with my wife and children watching the straight running events against the Victoria club I believe,so that and seeing a guy with radio control air sea rescue launch got me started building model boats something which I had last done as a nipper.Does the King's mere club still exist,last time I went by the pond a few years back it had shrunk in size and was very overgrown around the edges.

Guestbook Post by RNinMunich Fleet Admiral!   Posted: 2 months ago
Hi All. Many may already recognise the 'nutter from Munich' 😁 but I just wanted to say- I first stumbled across this site and enrolled here in 2014 but was still in harness and trundling around the world working with various navies and shipyards on all sorts of naval ships from small Fast Patrol Boats through subs, Corvettes and Frigates up to LPDs, Heli and Escort Carriers. So I didn't have much time for model building (sounds better than 'Modelling' somehow 😁😲) or contributions to the site, but I did try to keep up to date with advances, as I always did in my profession - Naval COMMS systems - and dipped in and out of this site without getting involved. Since I retired last year I have become an active member and have also dipped into, and registered with some, other Model Boat forums in various countries. But in all of them I have never found such an international, friendly and knowledgable bunch as on this site. Or such a well organised site where it is 'relatively' easy to find the info you need, or to just ask and get informed answers pronto. Sure there is room for improvement in some areas but "Tempus fugit" and things move on - so is it also on this site. I understand that a facelift and changes are afoot😉 whatever the outcome I'm sure you won't find a better web site for informed (bin there done that!) info on model boat / ship building as well as research on the original vessels this side of the asteroid belt! Welcome aboard and Happy Building and Sailing, All the best, cheers, Doug 😎

Hobby Engine Factory Tug Motors by jelley_baby Captain   Posted: 2 months ago
Hi I have just read your post about your tug, I am one of those who modified mine to two new motors:- A. Because the original gear box nylon pinion gears split and there was no way that one could get them to fix securely back on to the motor shaft, plus the fact that when initially refitted they would no longer mesh and if the motors stopped at the wrong point they would not restart they just jammed. B. I wanted to make the tug more manoeuvrable so fitted separate speed controllers to each motor enabling me to run one motor forward and one in reverse this with suitable rudder positioning allows the tug to rotate on its axis with very little forward or reverse motion. C. I was able to use a 6v 4Ah Gel type battery which gives a much greater runtime. As to the old gearbox I think that because the gears were split it was disposed of. Somewhere in my harbour here there should be some photo’s of the conversion. I am now using speed 300 motors with a 2.5:1 reduction position much further forward in the hull an I made extension shafts to the original fitted ones, and it all works. Hope this helps and perhaps explained the need to change the original setup. Graham