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>> Home > Tags > weight

weight
weight
Damen Stan 4207 by RHBaker Admiral   Posted: 7 days ago
Decided to advance LI-PO plans and try a 4S 4000mAh pack. This weight of this pack reduced overall model weight by 8 oz, so it is now 9.6 lbs, close to the original target. Was also to slide the pack further sternwards until it touched the inner face of the RIB slipway, about 2.5” from the stern. The effect on the waterline was limited; the model now sits slightly higher with the waterline remaining level. Slowly increased the speed of the motors to assess the LI-PO performance. There was a significant improvement. There is no need to use “ full” power as it probably exceeds max scale speed. As the model accelerates the bow lifts exposing an area of the red bottom paint. The wake streams down the side of the vessel and curls off the spray rails. She looks very realistic. The attached picture is at part speed. The model is totally controllable, the influence of the centre fins is noticeable as the heeling is not pronounced unless extreme manoeuvring is tried. After 90 minutes of use decided all original objectives for the model are now accomplished. She looks and performs well. The next task is to tidy up the temporary wiring and fit the LI-PO properly. Will also have to re-route more accessories through the voltage reducer fitted for the bow thruster so the LED lights are not overpowered. Have also bought a small r/c controlled child’s jet ski toy with the intention is using the drive and control system in the RIB. It will require much mutilation of both the jet ski and the RIB to work them in together, but think it can be achieved. My next blog will tell.

what fittings for a plane prop by canabus Lieutenant   Posted: 7 days ago
Hi All Have a look on the Hobbyking site, the motors generally have prop size, thrust, battery and hairy plane weight.

what fittings for a plane prop by Dave M Fleet Admiral!   Posted: 7 days ago
Hi Sonar If you are buying a motor and prop together chances are all the fittings will be provided. You mention an ad so are you buying a model plane? If so a suitable motor and prop should be suggested. As an ex flyer this can be difficult to get right and the overall weight plays a big part in your choice. If it's too heavy it will fly like a brick so motor prop and battery need to be chosen to suit the type of plane. Just like boats some are fast and others slow and the prop needs to be right for the plane. If you have decided on a particular model it would help to know what it is, please? Dave

SG&K 1920 Gentlemans Runabout Mk2 by canabus Lieutenant   Posted: 7 days ago
Hi All I have started my redesigned runabout by increasing the length to 860mm. The motor and ESC will move to under the removal dash for better weight balance. Increase the engine hatch to get the Lipo battery, receiver and servo into. This will be hidden by the deck planking and the original hatch size will get it back to scale look. Brushless motor 3639-1100kv,3S battery, 60A car ESC and 37mm 3 blade prop.

Constellation by Jerry Todd Lieutenant   Posted: 8 days ago
This model was started in February of 1999, and has been worked on, at best, in fits and starts. While progress has been made, and it's capable of sailing, it's far from finished. It began as plywood paneling pulled from the walls of my first house and cut into frames. It was to be planked with white pine strips, also scraps from remodeling, but I was distracted by a book. Nasty things books, put all sorts of ideas in your head. I got the idea of making a plug for a mold so I could turn out THREE hulls! One for me, one for sale, and one to be donated to the real ship. To that end, and with the inspiration of the book, instead of planking, I battened the hull and sheathed it with brown paper wet-n-stick packing tape. Let's just say, that wasn't a good idea and leave it at that. A lot of life changes happened; moved to a farm; got unmarried, sold the farm, got an apartment, got a house with a workshop, and 10 years later, recommenced work on the model. I continued on with the original plan for about a day when I shifted gears and decided to glass the "plug" and make it a hull. I proceeded to prep it to that end, but looking back, what I should have done was strip it down the the forms and start again, planking it properly. Instead, I covered the outside with 4oz cloth, filled between the battens with poly resin and glass matting. The images show the model from it's start to it's glassing, though the site won't allow me to dictate the order in which they're presented - sorry for that. The model is of the American sloop of war Constellation launched in 1855, and as she appeared in Naples in 1856 based on a painting of her by Thomas deSimone. She is 1:36 scale; 1 inch = 3 feet. Beam: 13-5/8" (34.6 cm) Length on deck: 61" (154.9 cm) Length between perpendiculars (American): 59-1/8" (150.2 cm) Draft, without ballast keel: 7" (17.8 cm) With 3-1/2" ballast keel: 10-1/2" (26.7 cm) Weight, with ballast: Approx. 100 pounds (45.36 kg) Length over the rig: 95" (241.3 cm) Width over the rig: 30.5" (77.5 cm) ~ Main yard w/o stuns'l booms. Height bottom of keel to main truck, without ballast keel: 65" (165.1 cm) With ballast keel: 69" (175.3 cm) Total Sail Area: 2,807.01 square inches in 17 sails (19.5 sf, 18,110 scm, 1.8 sqm) Working Sail Area: 1,836.1square inches in 13 sails (12.75 sf, 11,845 scm, 1.2 sqm)

Jet Sprint Boat by Rod Commander   Posted: 12 days ago
Well finally finished the actual boat and now ready for fit out Zenoah 26 cc marine engine arrived this morning and jet unit on its way so busy days ahead Got to make roll bars to scale yet probably use aluminium to save weight The engine develops 3.4 hp at 13000 revs so should give it a bit of punch 1/4 scale crew to order yet and some instruments for dash board Think I will have a wee break from it all for a while and give my mancave/ Messcave a bit of a tidy up lol

Gentlemans Cruiser by muddy Captain   Posted: 13 days ago
Started on the upper-works/cabin. Ring saw came into its own again. Followed up by the small mini drill, similar to a Dremil but with a bigger chuck which is handy, using Dremil 1/2" drum sander to clean up the window inner edges. Used 1.5mm ply for the cabin sides as they are going to be veneered, found a pice of veneer under the bench it nearly had roots, and i think, think, it's Teak. This was all glued up under weight using a PVA glue, probably the one in the pics, but an Alphatic. then when glue well and truly dry, Using a No10 scalpel blade to remove the innards of the window frames, and a quick swish with some fine grade sandpaper, not sure about any window frames as yet. ( to many windows for me ... ! ) Regards Muddy....

Fairy Huntsman by Dave M Fleet Admiral!   Posted: 16 days 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 Dave M Fleet Admiral!   Posted: 17 days ago
Hi Phil No problem I enjoy tasking opportunities to expand my knowledge. Weight distribution can be critical in marine craft and your solution should help control the lifting problem. With the mono you should not experience the problem, but with lots of power and a very aggressive jet of water I would expect the initial 1 to 2 secs to be interesting and you will need to be on your toes to keep it straight!

Jet Sprint Boat by Dave M Fleet Admiral!   Posted: 17 days ago
Hi Phil I have no experience with three point hydro so any suggestions / observations are not based on personal experience. Is it always the same sponson that lifts? With three points of contact any slight misalignment or weight difference could result in one point digging in and raising the other. This would be made worse if the thrust nozzle was slightly misaligned. As Doug has pointed out the full size were difficult to keep in a straight line. You haven't said but I assume you correct the lift by turning the Nozzle. When I used to fly model planes I used to apply slight right rudder to keep the model straight on take-off and I wonder if you could apply a similar principle to your model. This is real cutting edge modelling and I look forward to hearing how you progress. Dave

Fairplay X - Plastic Magic! :-) by saintsalvio Commander   Posted: 19 days ago
I used the stack two motors; the circuits and the esc so as the control radio of the tiny submarine i got for the purpose; the weight was right to float correct by the waterline; you can see it on a video on my little Youtube channel (look at Salvatore Mazzarella ) rescuing a sunseeker predator yacht with many glamour ladies in the bathub. P.S. unfortunately I am still living at work!

Motor suppression by colinhubbard Fleet Admiral!   Posted: 19 days ago
Hi all, have just finished testing the Caroline. Dry weight including battery was 13.2 Kilos. placed in paddling pool and she sits nice and level, I attached a set of fishing scales to the transome and tethered them to bench at end of pool. Slowly increased power and at full throttle gave a reading of 7kgs on the scale, at half throttle still showed 5kgs and water was lifting over poolside. Although pool is only 1ft longer than boat enough power to lift bow, in fact she tried to climb out. So well pleased with results👍. Battery lasted 1.25 hours at half throttle. So looking forward to her maiden voyage on Worcester Model Boat club open day, I feel like a 5 year old looking forward to xmas😊. My son is going to help me on the day as she's such a big lump, should realy have a slipway launch. Hope some of you will be there to watch. Going shopping now, fire boat needs a new battery for fire fighting pump. Best wishes Colin. (photo WITH BLUE BACKGROUND was before refurb)

Fairplay X - Plastic Magic! :-) by RNinMunich Fleet Admiral!   Posted: 19 days ago
Nice one Saintsalvio 👍 I have the Revell Harbour Tug kit - ca 15cm and intend to do the same as you and motorise it. Micro motor, servo and RX already purchased. have to be very very careful with the weight; max 96gm payload!! What battery are you using? Cheers Doug 😎 PS Nice place to live as well 😉

Motor suppression by colinhubbard Fleet Admiral!   Posted: 20 days ago
Hi Doug, the prop looks a bit small, but the boat is 5 foot long, and 1.5 foot beam. Weight? Not sure yet, first sailing in 22 years. As been used for display at vintage shows for last fifteen. So family is excited to see how dads old boat goes, as none of my sisters ever saw it. Fingers crossed. By for now Colin.

Shelduck by muddy Captain   Posted: 22 days ago
Installing the Radio gear. Planking the Deck in 6mm x 2mm and .5mm Mahogany vertically used as "Caulking". A lot of brass pins.. !... Lead Keel, about 10lb; in weight. It was supposed to be "Let into" the keel, but a lot of extra work, decided to screw it to the bottom, hoping this would give it more stability having a deeper keel. Regards Muddy ....