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HomeAircraftHelicopterMiniature Aircraft Whiplash & Fury 55 › Start Shaft "Flat Spot" Question
02-11-2006 01:54 PM  12 years agoPost 1
Ron Cosby

rrApprentice

Shreveport, Louisiana

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Here's a question I ran upon in building a new Tempest,
Do I need to file a flat area on the start shaft to hold the adapter securely or will it stay tight without it? I have a Raptor adapter.
There's no dimple on the shaft for a set screw. I'm running a YS90 in this one.

Thanks

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02-11-2006 03:07 PM  12 years agoPost 2
Ralphw

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Spring, TX

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I put a one on my Tempest start shaft. I'm not sure it was absolutely needed, but I've had no problems with it slipping since it was installed a year ago.

Ralph W.
"Life's Short, Fly Fast"

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02-11-2006 03:44 PM  12 years agoPost 3
Jerry Sudimick

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Connecticut

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I have never put a flat spot on my Fury start shafts. I've always run a start adapter with no issues.

If you are apprehensive about not grinding the flat - use a little green loctite. Go easy, because someday you will want to get that assembly apart.

Grinding that shaft is difficult because it is very hard. Once you do it, you can never use the shaft again with a Pro-flex system. You may not care, but the person who buys the machine from you sure will - and to replace that shaft is not cheap.

Jerry

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02-11-2006 04:22 PM  12 years agoPost 4
thenewguy

rrElite Veteran

Corvallis, Oregon Where there is liquid sunshine!

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The shaft is not that hard to grind. I just did mine last week. I have a Stratus with a OS 90 in it. Just took a Dremal grinding wheel and put a flat spot on the shaft while in still in the heli. Took about 5 seconds. I do it just to give that extra little protection , from not slipping. But Jerry Sudimick does have a good point about the resale and usage later.

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02-11-2006 05:57 PM  12 years agoPost 5
modifyit15

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Spartanburg, SC

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I put a very small flat spot on my stratus with a dremel, made sure there were no burs. but now I am using a flex shaft. flat spot still there and no problms. if you sell it the only people that may have a problem with it are MA people with a pro flex, which you can tell by the forum count is lower than a lot of other helis out there.
just my $0.02

Fly 60% take heli home Fly 150% take parts home

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02-11-2006 06:04 PM  12 years agoPost 6
Ron Cosby

rrApprentice

Shreveport, Louisiana

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THANKS for the responses, armed with that I think I'm going to put a small flat on the shaft while its easy to get at.

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02-11-2006 06:07 PM  12 years agoPost 7
tylerexpress

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Bossier City, LA

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I don't put flat spots on the shaft. I just use a little loctite and tighten it down and fly it low!!!!!!!!!

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