uncle festa Posted March 1, 2013 Share Posted March 1, 2013 Hi i have a model tech p51d mustang before i fly this model has anyone had issues with center of gravity and would a os 91 four stroke be man enough to fly this plane many thanks Quote Link to comment Share on other sites More sharing options...
Greybeard Posted March 1, 2013 Share Posted March 1, 2013 I think a 91 4t would be excessive. The balance point is detailed on page 59 of the instructions, assuming that this is the correct model. Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted March 1, 2013 Share Posted March 1, 2013 a 91 four stroke in a 46 size model - I'd respectfully suggest that if you need to ask the question, then the answer is probably no. Quote Link to comment Share on other sites More sharing options...
uncle festa Posted March 1, 2013 Author Share Posted March 1, 2013 i think you have the wrong model this a 66" wingspan model tech it is quite an old kit and i do not have the insructions Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted March 1, 2013 Share Posted March 1, 2013 apologies, in that case a 90 4 stroke sounds about right! My H9 Harvard at 68" is quite gentle with an RCV91CD, an OS has alittle more power so sounds a good choice. Quote Link to comment Share on other sites More sharing options...
uncle festa Posted March 1, 2013 Author Share Posted March 1, 2013 as i dont have the instruction manual this basicly an early artf most of the building is done you just have to put it together and cover and paint this a 66" wing span model tech p51d mustang has any have one and sugest a centre of gravity many thanks Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted March 1, 2013 Share Posted March 1, 2013 I would suggest that a safe starting point would be 25% of the root chord back from the leading edge at the root. I would also suggest taking the root chord starting at a point in line with the straight leading edge and ignoring the small swept forward part for the wheels.' i.e Draw a line that continues the main leading edge and use that as a starting point Quote Link to comment Share on other sites More sharing options...
Eamonn Fahey Posted March 1, 2013 Share Posted March 1, 2013 When you have worked out where the Centre of Gravity is, HobbyKing have a decal sheet that you can apply to your model so you always know where it is. Quote Link to comment Share on other sites More sharing options...
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