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Stabilizer static balance?
How many of you guys are static balancing your all-flying stabilizers? I am preping an old X-Terminator, BVM/Viojett powered, and checked the stab for balance. The stabs are significantly tail heavy and will require about 4 ounces of lead (2 ounces in each stab leading edge) to static balance neutral. I'd probably need another 2 ounces in the nose to offset the weight if I can't take care of it with the battery pack.
So, do I need the additional 6 ounces of weight, or do I simply use a strong servo to prevent stab flutter? What would be the minimum servo power you would recommend if I go the "strong servo" route? Thanks, Tom |
RE: Stabilizer static balance?
I've never balanced any stabs. Thousand's of flights a-ok.
Raf |
RE: Stabilizer static balance?
Thanks Raf. Can you please tell me what model, weight and stab sevro combinations you have used?
Tom |
RE: Stabilizer static balance?
SM F-15 25ish pounds jr 8611a 100+ flights
SM F-18c x2 30ish pounds jr 8611a 2 flights, 30-40 flights Extreme Jets F-18C 30 ish pounds Hitec 5955 11 flights JL F-18C 30ish pounds JR 8611a 200 flights SM F-4C 30ish pounds jr 8611a 40-50 flights Century Jets F-4C 30ish pounds 8611a 40-50 flights Do you need more info? What's an x-terminator? Raf |
RE: Stabilizer static balance?
Hi Tom,
You might want to check with Chris Setting (the designer) on the set up, he posts on here pretty regularly. On a (somewhat) related issue, I had an early Terminator and the stabilator pivot point was too far aft. I think I ended up moving it about 3/4 of an inch forward after an aero friend did some analysis. The stabilator did not flutter, but the plane suffered a massive porpoising (about 2-3 cycles per second) at about 100 mph, very scary. BTW I had a BVM fan and a 91R in mine, it was pretty fast, hard to land (slow down) I ended up adding a belly speed brake just like my BVM Viper. Good luck, |
RE: Stabilizer static balance?
Typically, full flying stabs are balanced by adding 80% of the weight that is needed to balance them level i.e. if you need 2 oz, add only 80% of 2 oz or 1.6oz.
Regards Peter ORIGINAL: TJK How many of you guys are static balancing your all-flying stabilizers? I am preping an old X-Terminator, BVM/Viojett powered, and checked the stab for balance. The stabs are significantly tail heavy and will require about 4 ounces of lead (2 ounces in each stab leading edge) to static balance neutral. I'd probably need another 2 ounces in the nose to offset the weight if I can't take care of it with the battery pack. So, do I need the additional 6 ounces of weight, or do I simply use a strong servo to prevent stab flutter? What would be the minimum servo power you would recommend if I go the "strong servo" route? Thanks, Tom |
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