Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

servo info needed for speed plane

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Old 12-26-2007, 04:19 PM
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Zman39
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Default servo info needed for speed plane

okay here is deal. I have a scratch built, for strength and lightweight pylon looking plane, sorta built and ready for electronics. With my Jett .50 will come in a little under 3#. I know the airframe will handle it but am trying to pick servos for it. I already had the .50 so I don't have a whole lot of money in plane. I am looking for advice on a good servo that won't break the bank but has good chance of no slop that might introduce any flutter. It needs to be standard size if at all possible.

Thanks for any advice

Z
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Old 12-26-2007, 05:44 PM
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Mike Connor
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Default RE: servo info needed for speed plane

I like the HItec 225 BB for $21 each. They are a mini servo so you can save room and weight.
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Old 12-26-2007, 09:30 PM
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Crazy4Flight
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Default RE: servo info needed for speed plane


hitec HS-85BB for throttle
hitec HS-85MG for rudder ( micro must have metal gear fore rudder ) or got up to HS-225
JR sport 126MG about 35.00 Aileron and elevator, lots of bang for your buck!
Or Hitec HS-5475HB Aileron and elevator 60 oz digital karbonite gears 4x stronger than nylon.

bob
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Old 12-27-2007, 12:50 AM
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freakingfast
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Default RE: servo info needed for speed plane

It looks like JR is replacing the 125MG with the 126MG, thank god.
Hitec's Karbonite gears have worked great in my abused sport planes. Just don't use loctite on the control arm retaining screw and only use the same screw provided.
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Old 12-27-2007, 07:36 AM
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daven
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Default RE: servo info needed for speed plane

JR Sport 48's would work fine also.
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Old 01-13-2008, 06:19 PM
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RabC
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Default RE: servo info needed for speed plane

yea i have futaba gear,and scratching a racer with a v tail set up for the first time and am wondering also the best servs to use,it's a 15 size so they will have to be small.any advice anyone please,much thanks.
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Old 01-14-2008, 07:04 PM
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Default RE: servo info needed for speed plane

I've ran 160mph .40 size pylon planes on HS-81MG's without any fuss on 4.8V. I've also taken 60" wingspan sailplanes to 200mph and popped 50g turns without any fuss on a single HS-81MG on the V-tail and a HS-81MG on each aileron also on 4.8V. If you do 6V you will get a nice increase in torque and speed. You really don't need very much torque on most .40 size and smaller speed planes as they generally have very small control surfaces and your deflection at speed is minuscule. Obviously the more you have the better. HS-85MG is a good micro servo as well with a nice jump in torque over a HS-81MG. If you need something thin 125MG's at 6 volts are a great servo and I've also used these on the rather large flaps and ailerons of 2 meter sailplanes going 210+ mph and 50+ G's without any problem. If you step up to a mini size servo the HS-225MG with 6 volts is a torque monster and way overkill for a small airframe with small control surfaces but a great way to go if you have the space.
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