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

JR 368 bb mg

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Old 12-04-2007, 08:48 AM
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glowplug50
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Default JR 368 bb mg

Are the JR 368 bb mg good for q500 (Nelson/Jett)? They are rated at at 52 oz at 4.8. Rather small but only .8 oz in weight.
I am sure they fit the torque requirement but is the 2 screw mount solid enough compared to 4 screws as far as flexing and such? If not, what is the servo of choice these days (JR)?
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Old 12-04-2007, 01:38 PM
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daven
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Default RE: JR 368 bb mg

JR 3121 is the main JR servo the sponsored guys are using.

I've used the 368's and they have been fine, but I remember others reporting issues with that servo.
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Old 12-04-2007, 04:17 PM
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Default RE: JR 368 bb mg

Thanks Dave
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Old 12-04-2007, 05:24 PM
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Default RE: JR 368 bb mg

I've used a few JR Sport 48's with good success on V-tailed Quickies.

Looks very similar to the 3121 but at a lot less $$$.
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Old 12-05-2007, 12:17 AM
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Default RE: JR 368 bb mg

JR servos are "top shelf" however I avoid their Sport Series like the plague.
I have hundreds of aggressive high rate flights on a Viper with Hitec HS 225 MG’s no problems and still very tight. I even have them on a 40 size high wing Dragon. They use four mounting screws. Note! If you bumped a control surface hard or crashed, inspect the inside top of the gear case at the bosses that hold the small gear shafts for break outs. Do this even if it feels fine under load. It’s the only weak point I know of.

HS-225MG BB Micro Servo Specifications:
• Bearing Type: Top Ball Bearing
• Torque @ 4.8v: 55oz\in (3.9kg\cm)
• Torque @ 6.0v: 67oz\in (4.8kg\cm)
• Speed @ 60 degrees @ 4.8v: 0.14
• Speed @ 60 degrees @ 6.0v: 0.11
• Standard Size L x W x H: 1.3" x 0.7" x 1.3 " (33mm x 18mm x 33mm)
• Weight: 0.98oz (32 g)
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