javier figueroa

What are the recomended engine incidences for a WM super chiupmunk 90? It has a OS 90 four stroke and it has a trend to climb . Thanks!!!

Gray Beard

My Feedback: (-1)

I always set everything without thrust then change as needed. That climb may be wing incidence, CG, stab incidence as well as engine thrust.

javier figueroa

Thank you for your note.

Could you please help me to understand how the CG can affect the climb? Thanks again!!

DavidAgar

My Feedback: (108)

Tail draggers usually have 2 degrees of right in them to compensate for engine torque. You could put in 2 degrees of down and give it a try. The CG effects the plane by making it go up and down. Nose heavy will make it fall and tail heavy will make it climb, but tail heavy will also usually effect your flight controls as well. Balance the plane again and if it is right on, then put a couple of washers on the top motor mount screws and see if that helps. Good Luck, Dave

Lnewqban

javier,

This chart will guide you to determine if your model has a thrust angle problem or not:

http://nsrca.us/all/flying/177-trimchart.html

Without any power (engine off), the tendency to claim depends only on the relation between CG location, decalage and/or elevator trim:

http://www.charlesriverrc.org/articl...GMarkDrela.htm

http://fatlion.com/sailplanes/decalage.html