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Sep 20, 2019, 06:02 PM
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Seeking advice. PA-24 Comanche

Hello from Crete Island.
We are building a Piper Comanche (PA-24) single engine following the Berkeleys 54” old plans that we resized them to 72”.
The plan as you know it is very old and we are heavily modifying it to the today’s characteristics such as removable canopy for better access to the interior, retracting landing gears, navigation lights, empennage access alla sctratch build even the nav lights circuit.
Although the building process is going very well, we plan to post a building log here and also in our rcgroups blog, that we already have a build log for a Cessna 172S scratch build following and modifying Marutaka’s plan.

We tried to build a flown tail with self adjusting trim tab but due to the lack of materials we abandon the idea to have it full scale.

Our question applies in this part (Stabilizer). What would be the right incidence to have ?. Searching around was not able to find any info from arf models.
It is clear as the drawings indicate that the wing has a +2 deg incidence.
Any advice or experience to this model would be very much appreciated.

SV1COD Emmanuel (Manos)
Last edited by SV1COD; Sep 20, 2019 at 06:25 PM.
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Sep 20, 2019, 06:17 PM
B for Bruce
BMatthews's Avatar
Models of private aircraft typically use a farther rearward balance point than do the full scale aircraft. So they do not need as much angle between the wing and stabilizer. Assuming you balance the model at around 28 to 30% of the wing chord then you really only need around 2° difference. And since you already have that much at the wing you can make the stabilizer sit at 0 to your reference line used to measure the wing incidence.

During the flight testing you might find that you need a touch of up or down trim depending on where you place the balance point and how fast the model has to fly. But it'll be pretty close.
Sep 20, 2019, 06:35 PM
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Thank you Bruce for the quick reply
Had the same thought about the 2 deg dif (Decalage) between main wing and stabilizer that will be enough or +/- little adjustment.

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