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HomeAircraftHelicopterVario Sky Fox - Benzin - Evolution - Xtreme › Benzin Clutch Slipping on Spoolup
12-08-2004 06:44 PM  13 years agoPost 1
gilliraldi

rrApprentice

Epsom, NH

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When I am spooling up, the blades all of a sudden lose momentum. I suspect its the clutch, but what kinds of things should I be looking for?

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12-08-2004 08:46 PM  13 years agoPost 2
High Altitude

rrNovice

Calgary

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Make sure you have the locking pins in all the shafts. They are held in with a set screw and could have possibly come loose. You need to check every gear for this. Also check the through pin on the main gear as well. If this does not help check to see that the clutch itself has not broken inside the bell. This has happened to me once before.
Good Luck

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12-08-2004 08:54 PM  13 years agoPost 3
gilliraldi

rrApprentice

Epsom, NH

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This is a brand new machine that Airstar built - so I can't imagine the clutch could be bad already. Regarding the pins, good idea, but it seems there is some power going to the blades, just alot of slippage... Any other thoughts?

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12-08-2004 10:22 PM  13 years agoPost 4
Notar

rrKey Veteran

Taxachussetts

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The only other thing is the belt is very loose, and it was not constructed properly with regard to belt tension.
Joe

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12-08-2004 10:44 PM  13 years agoPost 5
helicenter

rrVeteran

Winter Haven Fl.

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slipping
What blades and gear ratio do you have?

Doug

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12-08-2004 11:41 PM  13 years agoPost 6
High Altitude

rrNovice

Calgary

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You can also check the clutch lining. It may be that you have not used the right glue. If you let it idle for a long time then spool up it can get hot and this could cause the lining to break loose. If you do not have any glue go to the store and buy some JB Weld. Make sure you scuff the clutch inside so it has a good bite. Clean it with some thinner before you glue it. JB Weld works great and will not break down from the heat.
Good Luck

I don't know why my last post was removed? All I was doing was sharing some good info on some parts for my Benzin form Airstar which was a hell of a deal.

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12-09-2004 03:37 AM  13 years agoPost 7
MrDHEJ

rrVeteran

Taylorsville, Kentucky, USA

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Check the clutch bolt on the bottom of the engine. There is a brass tapered sleeve that goes between the crankshaft and the clutch. sounds like that could also be another possible problem if the bolt was not tightend enough, or to long of a bolt was used, or to much lock tight was used causing a hydro lock making it seem the bolt was tight enough.

Never go full retard!

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12-11-2004 04:29 AM  13 years agoPost 8
47g

rrNovice

Indpls. In.

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Check your Freewheel bearing. Had one go bad on my Benzin after only about 10 flights. As the blades spooled up the bearing would not hold. The engine would speed up and blades would slow down. Replaced the bearing problem solved.

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12-13-2004 07:00 PM  13 years agoPost 9
gilliraldi

rrApprentice

Epsom, NH

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I checked all the pins - everything is ok

I also checked the clutch lining - looks ok. However, it looks like it is made from a cardboard type material - is this ok?

The belt tension seems to be fine.

The bolt going through the clutch into the engine also appears to be very tight.

What else could be causing this? Please help!!

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12-13-2004 07:01 PM  13 years agoPost 10
gilliraldi

rrApprentice

Epsom, NH

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Freewheel bearing
Where is this freewheel bearing and what does it do? Thanks for all your help!

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12-13-2004 07:41 PM  13 years agoPost 11
Notar

rrKey Veteran

Taxachussetts

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The freewheel bearing is in the center of the large white main gear. You should be able to turn the head one way while holding the gear, but turning it the other way, you should not be able to hold the gear.

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12-13-2004 08:23 PM  13 years agoPost 12
gilliraldi

rrApprentice

Epsom, NH

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The problem does seem to be the freewheel bearing.

When I hold the head, I can move the main gear in both directions... Now that I know this is the problem, what can I do about it? Do I have to take apart the entire head?

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12-13-2004 08:28 PM  13 years agoPost 13
47g

rrNovice

Indpls. In.

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You will need to pull the main shaft and remove the main gear. The part # 830/36 is the replacement. Joe Howard will have them

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12-13-2004 08:52 PM  13 years agoPost 14
gilliraldi

rrApprentice

Epsom, NH

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What is the easiest way of removing the mainshaft? Can I remove the clamp that is underneath the main gear perhaps, or do I have to work from the top down?

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12-13-2004 09:05 PM  13 years agoPost 15
gilliraldi

rrApprentice

Epsom, NH

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Do I definately need a new bearing? I noticed they cost around $140!!!

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12-13-2004 09:12 PM  13 years agoPost 16
47g

rrNovice

Indpls. In.

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If you did not build the bird and do not have a instruction manual you need to get one. It will have part # and you will know if you are missing anything

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12-13-2004 09:40 PM  13 years agoPost 17
doorman

rrProfessor

Sherwood, Arkansas

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One Way
If this is a brand new unit, it is hard to believe that the one way would be bad.....
I just walked back and tried mine and if you hold the head you can only turn the main gear one way....
If you loosen the collor that is just below the upper bearing and then pop the links off the swashplate, you should be able to pull the main shaft very easily....you can leave the head on the main shaft along with everything else this way..
Did you get a set of instructions with this unit??
It maybe that the oneway is installed incorrectly...
If you remove the main gear and shaft, while out you can reverse the gear and then see if it locks up in one direction..
Good Luck

AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft

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01-12-2005 09:13 PM  13 years agoPost 18
gilliraldi

rrApprentice

Epsom, NH

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Thanks Airstar
Thanks for the support
I just wanted to thank Airstar for their help in resolving my issue with my tail boom. The heli I bought from Airstar is top quality - guys at my flying field are amazed at how well it is constructed and the extremely high quality of the parts. The problem I was having was due to my stupidity - nothing at all to do with Airstar. I see Airstar get bashed on this site quite often, and I just wanted to post my experience with them. I have been buying form them for years, and have had an extremely positive experience from the beginning.

When I called them for help, I received a return phonecall usually within an hour or so. I am very happy to do business with them, and I intend to do so again.

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