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Model Forum / Radio Controlled / Water Models / October 2008Fast Electrics - Newcomer questions!
Hi All, Im almost new to fast RC boats, but I'm exprenced in constructional techniques as I've built RC aircraft in the past. My questions are... I have a fibreglass hull, around 820mm long and intend to build something into it.. as I say I'm capable but quetions remain! 1) It weighs around 1.5kg without any running gear, battery or radio or decking fitted, so my all up weight icuding a 12V pack, servo, ESC, 2 x motors.. is going over 3kg. Is that now too heavy? 2) I can build one from scratch from some plans downloaded from here, but whats the finishing technique, build from Balsa/ply etc then glass fibre the hull? 3) Where should the centre of gravity be? Any input much appreciated! Stobby  Signaturestobby256 That seems extremely heavy. Is it a fiberglass hull or wood? Is it racing or scale (tugboat, etc)? For a mono hull or catamaran racing boat I always start with the CG at approx. 30-33% of the length of the hull from the stern. On a hydro, I try to balance just at the rear edge of the sponsons. > Hi All, > Im almost new to fast RC boats, but I'm exprenced in constructional [quoted text clipped - 18 lines] > > Stobby Details as follows :- - Fibreglass hull - 34" Length - 12" Beam - 1.2kg weight (empty, no R/C, motors props etc) :confused: - Racing Mono Hull Its great to think I'm not alone - thanks for any help! :) Signaturestobby256 my mean machine(29"/737mm) racing cat weighs in 3.75kg(approx) ready to rock! rex > Details as follows :- > [quoted text clipped - 5 lines] > > Its great to think I'm not alone - thanks for any help! :) just my two centsbump-------------------------------------------------------------*'wow power leveling' (http://www.powerleveling-wow.com/siteMap.asp)..'wow power leveling' (http://www.wowgoldweb.com/)..'Cheap WoW Gold' (http://www.gamelee.com/)..'WoW Gold' (http://www.gogoer.com/)..'World Of Warcraft gold' (http://www.gogoer.com/),* SignatureLihualee 'WoW Power Leveling' (http://www.igsstar.com) Yes 30-33% is close. I believe 29% is the magic #. I build my own wooden boats, monos mainly, i lift the boat empty till it is level and mark. I lay all my equipment in boat around the the mark except rx and rudder servo. Each are placed close to opposite rear corners. Now with lipos, i have to move motor towards the bow just alittle due to weight difference of lipos compared to nimh cells. The difference is about 5 oz. in favor of lipos. I have found that i do not need trim tabs. When i build a mono, i put on full lenght strakes with the last portion of strakes looking like steps which raises transom and gives a good ride attitude. I experimented with a No Step 1 and ran strakes to and including transom and works great. I did this also with a wooden El Lobo II plus ran strut down 1 degree negative and ended up with a very low roostertail and no trim tabs and small turn fins without much drag. Lipos are in saddle pack formation for easy cg purposes. Good luck and have fun. I would go BL systems that are waterproof. Now this may not be the route you want to take, but i did and thought it might help in some degree. SignatureDLM Great answers...! A picture would be good :) ANd whats a BL system.... Told you I was a newcomer! Steve Signaturestobby256 |
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