I'm working with a high school group that is working to build a full size kit plane. One of there tasks is to finish up a Ryan PT-20 that was donated. But the only information on the plane is listed bellow. I'm hopping someone has a book that would tell me what size servos to use an where the CG is on it. Any info that you can supply would be helpfull
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Almost Ready-To Fly (ARF)
2.5kg - 2.7kg (88.2-95.2 oz)
41.3dm sq. (444.6 sq in)
60.5g/dm sq. (29.7 oz/sq ft)
4 ch.,4 Servo
- Silver Grey color gel-coated FRP fuselage & cowling.
- Gel-coated FRP wheel cover.
- Complete scale mounting wire included.
- Pre-built, pre-covered balsa wing.
- Extremely stable flight performance due to large wing area and light weight.
- Kit includes engine mount, linkage parts and main & tail landing gear.
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Maybe somebody has a book, but until then:
Standard, non ballbearing servos should be fine. Something in the 42 in oz area.
Balance your model at the thickest part of the airfoil, which is usually the spar.
That is what I would do, if it were mine.
United States, AZ, Litchfield Park
Joined Jul 2002
Standard practice on a model with a constant chord wing is to balance at 1/3 of the wing chord. This will most likely be very close to the thickest point of the airfoil as noted by Tom. When in doubt err on the side of caution and balance more forward. Starting closer to 1/4 of the chord, while definitely more forward than necessary, should not result in any drastically negative effects. My .02 cents anyway.
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