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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › Roban Bell 222 Landing Gear Springs
08-30-2018 07:49 AM  80 days agoPost 1
Scanman

rrApprentice

Centralia, WA USA

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Looking to beef up the springs on my triple deuce. Just don't like the way they bottom out and sit so low to the ground. Has anyone changed to beefier springs and, if so, what did you go with. However, if this is acceptable for a scale 222 please let me know. Thanks for any input on the subject.

Vic
G380, G500, G630C, G770C
Aerodyne MD500E 600
Ecureuil AS350 700, Bell 222 800
Jeti DS-14 AMA 611227

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08-31-2018 12:05 PM  79 days agoPost 2
tgalo

rrVeteran

USA

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I thought about doing that on mine but from what I read they want them to be bottomed out. I fix transmissions for a living and you would need some pretty stout springs to keep them from bottoming anyway. I couldn't find anything to work. I thought about just making them ridged but never got to that...
T

Gravity's a bitch ant it?

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08-31-2018 02:16 PM  79 days agoPost 3
ssmith512

rrKey Veteran

Indianapolis, IN USA

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You do NOT want the heli supported by the springs. Very bad things can (and most likely will) happen with ground resonance if the heli is supported on the springs. You want the springs soft and to be fully compressed when on the ground.

Steve

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08-31-2018 03:00 PM  79 days agoPost 4
Scanman

rrApprentice

Centralia, WA USA

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Well, that settles it. Just going to keep things the way they are. I did not think about ground resonance. Thanks so much for the reply.

Vic
G380, G500, G630C, G770C
Aerodyne MD500E 600
Ecureuil AS350 700, Bell 222 800
Jeti DS-14 AMA 611227

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08-31-2018 04:19 PM  78 days agoPost 5
47fan

rrNovice

clancy montana

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Hi Scanman, Steve is correct about the ground resonance, it's bad juju. The other issue with the Roban 222 is that the gear squat so far that all the landing load ends up on the rear stop and a slightly hard landing can break the supports. Gee- how would I know that. I ended up adding a length of aluminum tubing and a washer over the bolt inside the spring to limit the downward travel and spread the load to the bushings as well. So far it has worked out well. Also, the 222 kits are short 2 bushings for the main gear retract rods. I added brass tubing there and epoxied them near the servos for stability. Just a thought. Mike

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09-01-2018 07:15 AM  78 days agoPost 6
Scanman

rrApprentice

Centralia, WA USA

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Thanks Mike, I need to hear more about this but am on a busy work schedule through the Holiday weekend. This could solve my problem but the resonance issue and cause of it with this bird has triggered my interest and I want to hear more, please elaborate on how you don't have it with your fix.
Thanks,

Vic
G380, G500, G630C, G770C
Aerodyne MD500E 600
Ecureuil AS350 700, Bell 222 800
Jeti DS-14 AMA 611227

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09-01-2018 05:20 PM  77 days agoPost 7
47fan

rrNovice

clancy montana

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Hi Vic, I never had a resonance issue with this helicopter, but the springs would bottom out and it would sit solidly on them. The addition of the tube and washer simply raised the point that the bottom out occurs, and gives the heli a better look when sitting. It also moves the center of the helicopter's weight slightly more directly over the retract pivot and spreads the landing load out a touch more so everything is not on those two little tabs on the back of the gear side frames. Hope that helps, Mike

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09-03-2018 07:46 AM  76 days agoPost 8
Scanman

rrApprentice

Centralia, WA USA

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I assume you also did the same to the nose gear? What length of tubing did you cut?

Vic
G380, G500, G630C, G770C
Aerodyne MD500E 600
Ecureuil AS350 700, Bell 222 800
Jeti DS-14 AMA 611227

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09-03-2018 10:00 AM  76 days agoPost 9
eeeeky

rrVeteran

Roosevelt UT USA

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Sitting on the springs is not a problem, what you want is good dampening. Maybe you could find a way to get some small rc car shocks in there with some thick oil to take care of the bouncy problem. The real machines do NOT sit on bottomed out suspension, bell 222, chinook, or any other wheeled helicopter. Of course they do spool up much smoother and slower.

Lets Fly!

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