How many ch radio needed?
12-25-2007, 02:07 AM
#26
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RE: How many ch radio needed?
ORIGINAL: soop7667
Correct! There's a site that you can get a DX7 with no servos, and it's a bit less sexpensive. The DS821 servo's that come with heli radio are not suitable for a Raptor - they tend to have a shearing off problem. (They break too easy)
just be mindful that I hear the servos aren't so great for heli's , hey, sell them on ebay and use that money for some GOOD servos
Well I haven't had any problems with my JR821 but then again I'm not banging my heli around the sky, just the ground them dam autos get me once in a while. For a beginer pilot the 821 should be fine then as you progress change them out for something better.
I guess I should add that I don't use the 821 for collective or rudder, just throttle and cyclic.
12-25-2007, 09:51 AM
#27
RE: How many ch radio needed?
From JR
Vibration seems to be the culprit, personally I wouldn't run them in any nitro heli.
New Guidelines for DS821 Servo Use
Tuesday, February 20, 2007
The DS821 servo is a powerful, accurate sport digital servo recommended for RC airplane applications up to 1.20-size. For helicopters, the DS821 operates best with 30-size glow models, and up to 50-size electric. Loads and vibration in larger models may cause premature failure of the servo resulting in damage or injury to property and persons.
Important: Do not use liquid thread lock with the DS821 servo!
Do not use any form of liquid thread lock to secure the servo arm screw to the output shaft of the DS821 servo. Chemicals in these liquids react with the polycarbonate gear set causing the plastic to become brittle, fracturing the final output gear.
Tuesday, February 20, 2007
The DS821 servo is a powerful, accurate sport digital servo recommended for RC airplane applications up to 1.20-size. For helicopters, the DS821 operates best with 30-size glow models, and up to 50-size electric. Loads and vibration in larger models may cause premature failure of the servo resulting in damage or injury to property and persons.
Important: Do not use liquid thread lock with the DS821 servo!
Do not use any form of liquid thread lock to secure the servo arm screw to the output shaft of the DS821 servo. Chemicals in these liquids react with the polycarbonate gear set causing the plastic to become brittle, fracturing the final output gear.
12-25-2007, 12:33 PM
#28
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RE: How many ch radio needed?
ORIGINAL: BarracudaHockey
From JR
Vibration seems to be the culprit, personally I wouldn't run them in any nitro heli.
From JR
New Guidelines for DS821 Servo Use
Tuesday, February 20, 2007
The DS821 servo is a powerful, accurate sport digital servo recommended for RC airplane applications up to 1.20-size. For helicopters, the DS821 operates best with 30-size glow models, and up to 50-size electric. Loads and vibration in larger models may cause premature failure of the servo resulting in damage or injury to property and persons.
Important: Do not use liquid thread lock with the DS821 servo!
Do not use any form of liquid thread lock to secure the servo arm screw to the output shaft of the DS821 servo. Chemicals in these liquids react with the polycarbonate gear set causing the plastic to become brittle, fracturing the final output gear.
Tuesday, February 20, 2007
The DS821 servo is a powerful, accurate sport digital servo recommended for RC airplane applications up to 1.20-size. For helicopters, the DS821 operates best with 30-size glow models, and up to 50-size electric. Loads and vibration in larger models may cause premature failure of the servo resulting in damage or injury to property and persons.
Important: Do not use liquid thread lock with the DS821 servo!
Do not use any form of liquid thread lock to secure the servo arm screw to the output shaft of the DS821 servo. Chemicals in these liquids react with the polycarbonate gear set causing the plastic to become brittle, fracturing the final output gear.
Wow I did not known that BH could you please post the link to that I want to check it out and see what servos are ok to use. Looks like I'll be buying a few new servos.
12-27-2007, 12:35 AM
#30
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RE: How many ch radio needed?
Thank you for the link. What surprises me is that JR and Horizon Hobby sell the new JR X9303 heli version with 4 JR 821 servos, and on Horizon Hobbyy's web site there is no disclaimer about the 821 servo.
Thank you for pointing that out BarracudaHockey. I will be looking into some new servos for my raptor. Does anyone have any suggestions for me?
http://www.horizonhobby.com/Products...ProdID=JRP2920
Thank you for pointing that out BarracudaHockey. I will be looking into some new servos for my raptor. Does anyone have any suggestions for me?
http://www.horizonhobby.com/Products...ProdID=JRP2920
12-27-2007, 03:58 PM
#31
RE: How many ch radio needed?
9252's would be my first upper mid level choice. Ron's has them for 69 each I think, anything will work on the throttle so you really only need the 3 swashplate servos. http://www.ronlund.com
