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Old Jan 30, 2013, 10:01 PM
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RCLT40's Avatar
Joined Mar 2011
16 Posts
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Ryan Pt-20

Guys.
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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this is
Specification
RYAN PT-20
Almost Ready-To Fly (ARF)
Lenght
1028mm (40.5")
Wing Span
1630mm (64")
Weight
2.5kg - 2.7kg (88.2-95.2 oz)
Wing Area
41.3dm sq. (444.6 sq in)
Wing Loading
60.5g/dm sq. (29.7 oz/sq ft)
Radio
4 ch.,4 Servo
Engine
4C .52
Kit feature

- 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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Old Jan 31, 2013, 07:48 AM
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TomCrump's Avatar
Traverse City, Michigan
Joined Dec 2005
10,805 Posts
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.
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Old Jan 31, 2013, 09:19 PM
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Joined Mar 2011
16 Posts
Thanks. Going to start on it this coming Monday so will see what it looks like then
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Old Feb 01, 2013, 02:17 PM
Scale Builder
United States, AZ, Litchfield Park
Joined Jul 2002
2,347 Posts
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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Old Feb 04, 2013, 02:52 PM
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Joined Mar 2011
16 Posts
So after looking at the plane again we decided to go electric. The box says it needs a 4c 52 engine what size electric would I need? Id like to possibility get it from hobby king because the school is on a budget.
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