craig procter Posted May 14, 2022 Share Posted May 14, 2022 I have a Spitfire with a Super Tigre 90 in it and it's almost ready for testing but before I do I wanted to know the easiest way to get a rough idea of the C of G. Can anyone help with this? 1 Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted May 14, 2022 Share Posted May 14, 2022 Complicated,any idea who's plan and what's it's span ?, I work on around 25% of the wing surface,,, Quote Link to comment Share on other sites More sharing options...
john davidson 1 Posted May 14, 2022 Share Posted May 14, 2022 Start at one third of the chord and work from there Quote Link to comment Share on other sites More sharing options...
Shaun Walsh Posted May 14, 2022 Share Posted May 14, 2022 Google cgCalc. It seems to work well. Quote Link to comment Share on other sites More sharing options...
J D 8 Posted May 14, 2022 Share Posted May 14, 2022 As above, the spit wing can be a bit awkward to figure where one third chord is but just measure at the line of the UC leg. Looks like a representation of a MK 5 or 9 but those gun blisters on the wing look silly big. Quote Link to comment Share on other sites More sharing options...
Piers Bowlan Posted May 15, 2022 Share Posted May 15, 2022 (edited) If the c of g is too far forward it will fly badly, too far back and it will fly once?. Any idea of what make of model it is, if it is ARTF or who designed it, if built from a plan? 25% of mean average chord as a starting point if you can’t find a published figure for the model. Good luck with the maiden Craig ?. Edited May 15, 2022 by Piers Bowlan Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted May 15, 2022 Share Posted May 15, 2022 You could have a look at eCakc - an online calculator. Caveat - I've never used it....... but I know others have used it as a starting point. Quote Link to comment Share on other sites More sharing options...
Jon H Posted May 15, 2022 Share Posted May 15, 2022 (edited) on spits i tend to use the pointy part of the wing tip as this is generally right on where the undercarriage join the wing. A google reveals that this is not far wide of the mark as this appears to be a topflite 63 inch spitfire and this is where the c/g is shown on the plans. all of the details are available here. https://outerzone.co.uk/plan_details.asp?ID=13243 As always with warbirds go easy on the elevator. I would recommend no more than 8mm movement as the elevator will be very powerful. Edited May 15, 2022 by Jon - Laser Engines Quote Link to comment Share on other sites More sharing options...
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