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ProModeler Scorpion Power
12-18-2003 07:05 PM  13 years agoPost 1
therydawg

Heliman

Boston, MA

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Hi,

I just installed a new clutch on my heli but it doesn't seem to engage. Occasionaly when it a low RPM it seens to try to engage but never does.

Ryan

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12-18-2003 08:02 PM  13 years agoPost 2
ROTATOR

Senior Heliman

Chesapeake, VA-------USA

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did you install a new clutch liner when you put the clutch in?

if you forgot the liner when installing the new clutch it won't lock up.

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12-18-2003 08:20 PM  13 years agoPost 3
therydawg

Heliman

Boston, MA

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I sure did

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12-18-2003 08:41 PM  13 years agoPost 4
ROTATOR

Senior Heliman

Chesapeake, VA-------USA

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How does the motor run? it is possible to start these things backwards and run fair, if so the clutch won't engauge. I'm not trying to insult your intelegence by saying it, I have had mine start backwards a couple of times and didn't realize it until it wouldn't engauge.

just a thought.

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12-18-2003 09:08 PM  13 years agoPost 5
therydawg

Heliman

Boston, MA

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The Motor runs Great, nice and smooth, the props turn in the right direction. Is it possible that I could have installed the clutch shoes backwards? It seems that they do not extend outwards into the liner/bell to catch.


Thanks,


Ryan

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12-18-2003 09:33 PM  13 years agoPost 6
d-n-jensen

Veteran

Bellevue WA

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When installing new liner and shoes it is important to get a tight fit. I shim my liners to get about the thickness of 2 layers of black electrical tape between the shoe and the liner. I use either pop can aluminum or match book cardboard paper as the shim between the bell and the liner to get the gap right. With the nexus clutch design it is improtant to get this right because when the gap is greater all the stress is placed on the shoe bolts that shear easily and often.

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12-19-2003 05:21 AM  13 years agoPost 7
therydawg

Heliman

Boston, MA

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I did not shim the liner but it was a tight fit. I kept trying to get the heli off of the ground but it seems to not have enough power.

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12-20-2003 01:26 AM  13 years agoPost 8
d-n-jensen

Veteran

Bellevue WA

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First you say the clutch is not engaging and now you say there is not enough power? Is the head spinning? What RPM is the head spinning at when you are attemping hover? The engine should have enough power to hover if tuned right. I suggest you find an experienced heli pilot in your area to help you.

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12-20-2003 12:52 PM  13 years agoPost 9
Drunk Monk

rrProfessor

Preston, UK

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With my MDS if the engine fires backwards you can easily tell because when you hold the head so it can't turn the tail blades spin quite happily since the one way bearing isn't working the right way. This doesn't happen when the engine is running the right way, you hold the head and the tail doesn't spin.

I agree with d-n-jensen, need more info about what's happening. By lack of power do you mean the engine looses revs when you try and hover?


Stephen

I only open my mouth to change feet.....

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12-20-2003 08:27 PM  13 years agoPost 10
therydawg

Heliman

Boston, MA

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No,

The Head is spinning but not fast enough to hover. The engine revs just fine...

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12-20-2003 08:45 PM  13 years agoPost 11
Drunk Monk

rrProfessor

Preston, UK

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If you look at the clutch housing can you see the clutch not fully in the housing or is it flush? The reason I ask is that some nexus' at my club have had a problem where the engine doesn't go fully in because of a big lump of plastic around where the fan sits hits the carb. I managed to snap 2 clutches before I realised what the problem was


Stephen

I only open my mouth to change feet.....

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12-21-2003 02:38 AM  13 years agoPost 12
therydawg

Heliman

Boston, MA

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The clutch is actually completely in the housing.

Ryan

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12-23-2003 02:41 PM  13 years agoPost 13
Salty

Elite Veteran

St. Augustine

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I had mine installed backwards once.....(dont work all day, then crawl in the garage and work on the hot rod until two am and then decide to work on the heli after that) yeah I pulled a stupid, I second jensens words, check the shoe runout/ proper rotating direction, and your pinion angle (affects the clutch bell)

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