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HomeAircraftHelicopterHelicopter Main Discussion › Bearings,,,,,,,
11-13-2014 02:43 AM  3 years agoPost 61
EEngineer

rrProfessor

TX

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I don't know about gassers. only fly electric helis

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11-13-2014 02:46 AM  3 years agoPost 62
turboomni

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East of the Equator

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Min Airs were known for this drive train efficiency and a big reason they auto so well. See what I mean about the spool down though? That heli is 12 lbs+

Setup is everything, All my heli's can fly far better than I can pilot them

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11-13-2014 02:54 AM  3 years agoPost 63
EEngineer

rrProfessor

TX

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Yeah, but I can't see how grease...or the lack of...would cause what you are describing....

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11-13-2014 03:05 AM  3 years agoPost 64
turboomni

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East of the Equator

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I can understand that. Mind you my 700E doesn't come to a screeching halt on spool down but as you know every little thing adds up. I will look into gear mesh in the tail transmission as well and add /remove shims,,gears ,,whatever. My other focus will be on the one way bearing in the main gear. I have heard this isn't the best design one way either and better units are available. My hope is to make as good or close to my Miniature Aircraft's drive trains. I hope the ceramic hybrids will help me to get there.

Setup is everything, All my heli's can fly far better than I can pilot them

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11-13-2014 04:37 AM  3 years agoPost 65
EEngineer

rrProfessor

TX

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I like the hybrids(steel races with ceramic balls) because the balls won't rust in humid weather....I still lube them with Tri-Flo, so the original grease is long gone....

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11-13-2014 04:44 AM  3 years agoPost 66
EEngineer

rrProfessor

TX

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Exactly...in the drive train....

Not knowing your build technique, little things can add up, for example:

When joining the frame halves, I use the mainshaft to ensure that the bearings/bearing blocks are aligned orthogonally, to the extent that I can.

If the mainshaft doesn't drop like a rock, my bearings/bearing blocks are not aligned properly...which causes wear/tear and drag.....

Stuff like that..

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11-13-2014 03:28 PM  3 years agoPost 67
turboomni

rrProfessor

East of the Equator

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Yes exactly.. all those little things add up!!

Setup is everything, All my heli's can fly far better than I can pilot them

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11-13-2014 04:32 PM  3 years agoPost 68
Richardmid1

rrProfessor

Leeds, England

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A gasser or nitro heli will spin down longer due to the extra drive train weight (main gear, pinion and clutch bell) all spinning together.

You can get longer spool down times by simply using heavier blades, Radix FBL blades are good for this.

Also NOT over tightening the lower Jesus bolt on an electric helps as it can distort the one way. They will also loosen up over time.

Iv'e just noticed he is using the Edge SE blades in the video which are quite weighty also.

60% of the time, it works every time!

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11-13-2014 05:01 PM  3 years agoPost 69
turboomni

rrProfessor

East of the Equator

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A gasser or nitro heli will spin down longer due to the extra drive train weight (main gear, pinion and clutch bell) all spinning together.
No,,,The Main gear and clutch bell do not spin on spool down when the clutch is not engaged. It may a little if the one way isn't perfectly free. But not at the same speed as the auto gear. Yes the Jesus bolt over tightening problem is obvious to many but very important too.

Setup is everything, All my heli's can fly far better than I can pilot them

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11-14-2014 10:11 AM  3 years agoPost 70
Richardmid1

rrProfessor

Leeds, England

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I have never had a one way so free as to not spin the main gear and clutch bell on spool down as the cluch bell generally spins much more freely.

60% of the time, it works every time!

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11-14-2014 02:50 PM  3 years agoPost 71
turboomni

rrProfessor

East of the Equator

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Neither have I but I guess I misunderstood you when you said
(main gear, pinion and clutch bell) all spinning together
as if one.

Setup is everything, All my heli's can fly far better than I can pilot them

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HomeAircraftHelicopterHelicopter Main Discussion › Bearings,,,,,,,
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