Stabilizer static balance?
04-08-2008 | 04:36 PM
#1
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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
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
04-09-2008 | 03:54 PM
#4
My Feedback: (11)
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
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
04-09-2008 | 04:03 PM
#5
My Feedback: (10)
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,
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,
04-09-2008 | 04:14 PM
#6
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From: Mississauga,
ON, CANADA
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
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
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
