Hi folks

We just finish my Hotspot kit...with P80 engine test run done..so nice!!! but got problem with the CG, they ask to do it with tank full is that normal?..please help...


cheers

NO!!! Tank empty. Do a search here as this has been gone over a few times before....I can't remember off hand what the CG is but 5 1/4 to 5 1/2 inches back from the leading edge of the wing measured where the wing meets the fin rings a bell. Please do a search to double check!!

Kevin

The directions I have say 7 to 7 1/2 inches. Measured along the leading edge from the boom at the root. A friend of mine is flying his at six inches and says it really tracks nice.
Good Luck!
Scott

Measure CG with main tank empty and hopper tank/UAT filled....gear up vs gear down makes almost no difference on the HotSpot since the main gear retracts toward the middle....the slight change caused by the nose gear coming down is insignificant.....

5 1/4" back from the leading edge, measured at the root contour on the fuselage is a very good starting point........I don't use the leading edge measurements since my 2 methods of setting CG, i.e. suspend the model using a plumb bob, or using a homemade pivot, are most convenient using marks on the fuselage for reference......

About 1/8" or about 3mm up reflex on the elevons also works well at that CG setting....then fine tune after your first trim flights.....

Tom