To convert to flaperons from basic single servo ailerons I'm looking for a slim servo...... slim enough that 2 can be mounted side by side in the center of my wing where 1 s3004 Futaba standard servo currently resides. Anybody know of any servos that would fit this bill?
Thanks!
- Michael
Oops... just checked and they're s3003 servos I have installed. Brain fart! :-(
- Michael
Ted shuffled out of his cave and grunted these great (and sometimes not so great) words of knowledge:
Depending on how much actual space you have available, possibly a HiTec
85 or another very good possibility are the Blue Bird servos - they are smaller than the 85 and just as powerful.I have used 2 HS225 servos in place of one standard but I did have to widen the space a bit. Did this with a Kaos kit.
Why not mount them end to end rather than on top of one another? Just cut a new mounting hole for the second servo closer to the root and fit the servo's whichever way round you need to get the linkages in the required place.
Chris
Hitec HS-81 is a pretty slim (0.47") and very inexpensive servo, if 36 oz/in of torque at 4.8V is enough in your case. Or maybe HS-85, which is a bit thicker (0.51") and has more torque (42 oz/in). I don't think you need anything as exotic as HS-125 (0.39"). But if you care about more torque then the metal-geared Futaba's s3102 might be a good choice: 0.5" thick with impressive 64 oz/in at 4.8V, although this one is relatively expensive.
Well Andy, it's on a .40 sized model with a 60"wingspan.... I'm not sure just how much power is required for each aileron really. Since a single s3003 is currently moving both ailerons, I'd assume only half as much power would be needed for each "slimline" servo right?
I can widen the mounting hole in the center of the wing somewhat if necessary..... I could probably even make it wide enough for 2 s3003 servos in fact while still fitting inside the width of the fusalage! However, I'd rather use 2 slimmer servos rather than cutting outa monster hole in my wing....lol!
- Michael
Michael...
You need to be careful doing this. Years ago I did the very same thing you're talking about, and replaced a single S-3001 BB servo with two mini servos that supposedly had almost as much torque as the S-3001...
On the first flight, BOTH of the mini servos stripped their gears... I was fortunate enough to get the plane back down using rudder and elevator. I went back with side-by-side S-3001 servos...
If at all possible try to eliminate the torque rods altogether, and mount the dual servos outboard in each wing, as near the center of the aileron as possible. This usually gives a totally slop-free installation.
Cheers,
Bill
Check out hitec 125 slim wing servos. Ed
Michael wrote:
Hitec HS-81 is a pretty slim (0.47") and very inexpensive servo, if 36 oz/in of torque at 4.8V is enough in your case. Or maybe HS-85, which is a bit thicker (0.51") and has more torque (42 oz/in). I don't think you need anything as exotic as HS-125 (0.39"). But if you care about more torque then the metal-geared Futaba's s3102 might be a good choice: 0.5" thick with impressive 64 oz/in at 4.8V, although this one is relatively expensive.
"Bill Fulmer" wrote in news:cTE6e.7311$B93.5298@lakeread06:
I want to second this - I've run into similar problems. I've concluded that while a small servo may have half as much torque as a standard, it may *not* have half as much strength.
About 1 oz lighter total (1/2 oz per servo), and more expensive (of course) would be something like the Hitec HS-225MG. Good torque, metal gears, and they seem to tolerate a lot of abuse. I'm using them (1 per wing) on my Simply Magic. It's a 3D ARF with a .46FX in the nose and #* (&# big ailerons, and I can slam the ailerons hard over at full speed without a hiccup. That gives me a basically uncontrollable roll rate (3+ rolls/sec? Something like that) - I have trouble picturing a more-or- less conventional setup with a .40 that would demand anything more of its servos.
They're not particularly slim, though - only 3 mm less than the 3001.
Absolutely! Keep the mechanical linkages as short, clean, and simple as possible. This ensures that a) all the torque your servo puts out will actually get to the control surface, b) the surface will center better, c) your servos will draw less power (less loss to linkage friction) and d) you're less likely to have flutter
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