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Slipper clutch date's

  • War49
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5 years 1 month ago #8258 by War49
Slipper clutch date's was created by War49
Hello Rotax Family members.......

When did Rotax start installing the slipper clutches with the new motors.....
I have serial# 4428472

Thanks.......
Warren
kitfox7
Maui,Hawaii

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5 years 1 month ago #8261 by RobSeaton
Replied by RobSeaton on topic Slipper clutch date's
The overload clutch was first introduced on the certified engines back in 1989. They are standard on all certified engine to this day (certification requirement: the multi-piece crank must have overload protection)
They are considered as "standard" for the 912ULS 100hp since approx 2001 (for the North American market anyways)
Your engine is a 2002 sold by the USA distributor so it likely has the clutch. It is easy to test; Can the tip of the prop be moved approx 8" with a strong guy holding the flywheel bolt with a wrench? Yes? you have a clutch.
For the 912UL 80hp the clutch is still an option.

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4 years 9 months ago #8932 by wingnut
Replied by wingnut on topic Slipper clutch date's
My rotax was built in 2002 with the serial number of 4427978. I'm doing a condition inspection and I put the stop bolt in and tried to slip the clutch, at 42.5 lbs i stop pulling because I thought I was going to break something. I had this box rebuilt 210 hours ago from lockwood, what do you guys think.

does my engine have a clutch?

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4 years 9 months ago #8937 by Roger Lee
Replied by Roger Lee on topic Slipper clutch date's
It doesn't sound like your gearbox has a clutch.
If it has a clutch it will start to move around 11-12 ft/lbs if you are pulling from 28-30 in. out from the center of the prop hub and should be somewhere around 420-490 in/lbs for a normal range for the final results.

inches from the prop hub center x ft/lbs (from the scale) = in/ lb (or Nm) final reading

i.e.
28 inches X 17 ft/lbs = 476 in/lbs (or 53.7 Nm)

Hi Rob,

I think the clutches were standard in the US in 2003 from Kodiak if I remember what Eric told me.


p.s.

Whatever you do do not bend that crank lock pin inside the case. If you do you will have to split the case to remove it.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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4 years 9 months ago #8940 by ron.greene
Replied by ron.greene on topic Slipper clutch date's
My 100HP 912ULS Serial Number 4427595 does not have a slipper clutch. I do not know the date of manufacture.

Ron Greene

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4 years 9 months ago #8941 by Roger Lee
Replied by Roger Lee on topic Slipper clutch date's
Up to about 2003 they were optional in the ULS in the US. Then they all stated to come with them. If yours doesn't have one you can still install it.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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4 years 9 months ago #8943 by wingnut
Replied by wingnut on topic Slipper clutch date's
2002 is the year built. I was able to get the pin out by hand so I know im good there. I just did not feel comfortable with the it was going. Without a clutch would this make it seem to start harder. There are few other 100hp on the feild and they start butter smooth. Mine still starter then I would like.

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4 years 9 months ago #8944 by Roger Lee
Replied by Roger Lee on topic Slipper clutch date's
These things make engines harder to start than others:

Low battery,
Too small a wire from the battery and or starter solenoid,
Old style starter,
Poor carb sync and or old carbs that could use a rebuild,
Poor idle and throttle use at start,
Primer verses choke (enricher),
Plug gaps and or old plugs,
Dirty air filter,
heavy a prop verses a light composite prop


Ask yourself about each of these.
The lack of the gearbox clutch shouldn't make it any harder to start.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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3 years 9 months ago #11484 by Paul Z
Replied by Paul Z on topic Slipper clutch date's
I have a ROTAX ULS 100HP, Serial Number 5,650.397, Engine Build Date: Dec 10, 2007 - I am assuming that since it is after 2002 I have a Slipper Clutch.

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3 years 9 months ago #11485 by Roger Lee
Replied by Roger Lee on topic Slipper clutch date's
If you live in the US, yes you should. Right around 2003 the 912ULS eng. brought into the US had them installed.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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3 months 6 days ago #22296 by mbisbing
Replied by mbisbing on topic Slipper clutch date's
Sir: I have a 1999 Rotax 912ULS s/n 4425267 without a slipper clutch.......will a slipper clutch P/N 996-910 work?
Anything you might tell me in this regard as to slipper clutch types and part numbers for this engine is greatly appreciated
Pls. reply mbisbing@hotmail.com
B/R
Mike

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3 months 6 days ago #22305 by mbisbing
Replied by mbisbing on topic Slipper clutch date's
Sir: I have a 1999 Rotax 912ULS s/n 4425267 without a slipper clutch.......will a slipper clutch P/N 996-910 work?
Anything you might tell me in this regard as to slipper clutch types and part numbers for this engine is greatly appreciated
Pls. reply mbisbing@hotmail.com
B/R
Mike

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3 months 5 days ago - 3 months 5 days ago #22320 by RobSeaton
Replied by RobSeaton on topic Slipper clutch date's
yes, and 'wide" clutch part number 996910, 996887 or 996886 will work with your engine.
Your engine has a 2.43:1 ratio "wide" gearset p/n 886518 (since beginning of 912ULS production)
The wide gearset has a 7 degree slope to the dogs, so do not use a clutch from a 912 80 Hp or a very early 914UL with "narrow" gear.
see pdf attached for more details

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Last edit: 3 months 5 days ago by RobSeaton.

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3 months 5 days ago #22322 by mbisbing
Replied by mbisbing on topic Slipper clutch date's
Wow, Rob that was quick.....and such authoritative info!!! This is just what I was looking for. A few years ago I bought two new ICP savannah airframes new in the box. I bought two new Rotax 912 engines 100hp one an S and the other a ULS. Since then the first airframe is flying, special airworthiness cert, and on FAA registry as N447VB. It has all the bells and whistles including twin sticks w/stick trim, twin brakes, under fuselage cargo pod, Vg's, gap seals, Czech bubble doors, 283 Kiev prop and a lot of other mods. The aircraft now has 65 flight hours on it and has performed flawlessly even with a whale of an instructor weighing 250 lbs. in the right seat. By myself I lift off at 50 mph indicated in 300 feet and have an 800 fpm rate of climb. With my dear portly instructor I lift off about 50 feet further and get 500 ftm climb. The engine has incredible torque requiring stiff right rudder on lift off to avoid having the aircraft turn over. I am very happy with it. The fuel economy is very good using 91-95 octane autofuel which is not expensive in texas. The second airframe is being set up for CZAW amphib floats so I need a clutch for the ULS. I expect with the floats adding 84 lbs. per side plus the weight of the water rudders, flying wires and support struts (6, three per side) that the aircraft will perform as the first airframe as if i had the instructor in it. I suspect with two people and full fuel and only 100hp the airframe will be a bit doggy and really stress the engine requiring constant high RPM's to stay aloft. Anyway, thanks for the info, really is a life and wallet saver. Well Done!!!!!
Best regards,
Mike

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