builder bob Posted August 18, 2011 Share Posted August 18, 2011 I'm designing my first plane and I knead help getting the dimensions right. Quote Link to comment Share on other sites More sharing options...
Tom Wright 2 Posted August 19, 2011 Share Posted August 19, 2011 What type of model bb ? Quote Link to comment Share on other sites More sharing options...
kevin wild Posted August 19, 2011 Share Posted August 19, 2011 if it looks right then it'll fly right. so they saythere is loads of help on forums so good on ya. have a goKev Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted August 19, 2011 Share Posted August 19, 2011 Before we can decide on dimensions we need to know what power you are using. If it is electric I can't help. If it is any engine I can. May I suggest "Designing Model Aircraft" from Traplet Publications (I don't get royalties) as this will save an awful lot of postings here as it covers everything you need to know.Edited By Peter Miller on 19/08/2011 08:39:36 Quote Link to comment Share on other sites More sharing options...
FlyinBrian Posted August 19, 2011 Share Posted August 19, 2011 Base your first design around the dimensions of a model known to fly well, you can change the fuz profile, wing tips and to a certain extent the wing shape but keep the wing and tail areas in proportion and the distance between them the same and you should be OK Good luck Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted August 19, 2011 Share Posted August 19, 2011 Perhaps a more fundamental question is "What sort of R/C flying and modelling experience do you have with which to embark on this design?" It would help folks a lot to respond to your question Bob if you filled in a few details on your personal profile page. Just go to "My Profile" in the tope left box. Just a brief resume of your modelling experience is what would help - we don't need your life story of your mother's maiden name! BEB Quote Link to comment Share on other sites More sharing options...
builder bob Posted August 21, 2011 Author Share Posted August 21, 2011 thanks for the info, the plane is going to be made of EPP and run on twin pneumatic motors. i can't figure out where the CG should be. anyone know how to get it in the wright spot? i can fly an over powered next step trainer. Quote Link to comment Share on other sites More sharing options...
builder bob Posted August 21, 2011 Author Share Posted August 21, 2011 i put stuff in my profile now Quote Link to comment Share on other sites More sharing options...
BB Posted August 21, 2011 Share Posted August 21, 2011 Ya need to make your profile public or no one can see it dude. Quote Link to comment Share on other sites More sharing options...
builder bob Posted August 21, 2011 Author Share Posted August 21, 2011 oops! did i do that now? I'm new to this website. Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted August 21, 2011 Share Posted August 21, 2011 On a conventional aircraft a safe position for the CG is at 25% chord. In other words a quarter of the average width of the wing back from the leading edge. This is simple on a parallel chord wing. A bit more complicated on a tapered wing. Quote Link to comment Share on other sites More sharing options...
builder bob Posted August 23, 2011 Author Share Posted August 23, 2011 thanks i'll make the plans Quote Link to comment Share on other sites More sharing options...
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