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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
|
 Posted: Fri May 05, 2006 7:35 am Post subject: Rotax Relapse/VW Weight and Noise |
 |
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| I really don't have a weight but I figure it is about 20lbs. more
than a
| Rotax 912.
|
| The noise I'm told is about like a GA airplane.
|
| Rick Neilsen
Well........if we knew how much the all up weight was of a 912UL or
912ULS, added 20 lbs to it, we would know how much Rick's VW weighs.
Wonder how a 912ULS in an old 60's era VW Bug would react. Bet it
would be a screamer right out of the box.
What prop are you running on the VW, Rick?
If it is anything other than a good two blade fixed pitch wooden prop,
it is going to make a lot of racket, same, same our 912's with Warp
Drive Props.
What does Valley Redrive use for torsional vibration dampening?
Bet you would see good results with the 912ULS gear box with slip
clutch. I saw a lot of difference in vibration, during cruise
especially, after I had the slip clutch installed on my 912ULS.
Take care,
john h
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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David.Lehman
Joined: 10 Jan 2006
Posts: 265
Location: "Lovely" Fresno CA
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| Posted: Fri May 05, 2006 7:43 am Post subject: Rotax Relapse/VW Weight and Noise |
|
|
Well, I think I figured out where Rick's engine came from... This poor guy
had to re-engine his Bug...
DVD
do not archive
On 5/5/06, John Hauck <jhauck(at)elmore.rr.com> wrote:
| Quote: |
| I really don't have a weight but I figure it is about 20lbs. more
than a
| Rotax 912.
|
| The noise I'm told is about like a GA airplane.
|
| Rick Neilsen
Well........if we knew how much the all up weight was of a 912UL or
912ULS, added 20 lbs to it, we would know how much Rick's VW weighs.
Wonder how a 912ULS in an old 60's era VW Bug would react. Bet it
would be a screamer right out of the box.
What prop are you running on the VW, Rick?
If it is anything other than a good two blade fixed pitch wooden prop,
it is going to make a lot of racket, same, same our 912's with Warp
Drive Props.
What does Valley Redrive use for torsional vibration dampening?
Bet you would see good results with the 912ULS gear box with slip
clutch. I saw a lot of difference in vibration, during cruise
especially, after I had the slip clutch installed on my 912ULS.
Take care,
john h
|
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_________________
ô¿ô
"Both optimists and pessimists contribute to the society. The optimist invents the aeroplane, the pessimist the parachute."
--- George Bernard Shaw |
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David.Lehman
Joined: 10 Jan 2006
Posts: 265
Location: "Lovely" Fresno CA
|
| Posted: Fri May 05, 2006 7:46 am Post subject: Rotax Relapse/VW Weight and Noise |
|
|
See I screwed that one up...
Here's the link:
http://www.sfgate.com/cgi-bin/article.cgi?file=3D/c/a/2006/04/30/MNGJGII7BB=
1.DTL&type=3Dcars
On 5/5/06, David Lehman <david(at)davidlehman.net> wrote:
| Quote: |
Well, I think I figured out where Rick's engine came from... This poor
guy had to re-engine his Bug...
DVD
do not archive
On 5/5/06, John Hauck <jhauck(at)elmore.rr.com> wrote:
>
>
>
> | I really don't have a weight but I figure it is about 20lbs. more
> than a
> | Rotax 912.
> |
> | The noise I'm told is about like a GA airplane.
> |
> | Rick Neilsen
>
> Well........if we knew how much the all up weight was of a 912UL or
> 912ULS, added 20 lbs to it, we would know how much Rick's VW weighs.
>
> Wonder how a 912ULS in an old 60's era VW Bug would react. Bet it
> would be a screamer right out of the box.
>
> What prop are you running on the VW, Rick?
>
> If it is anything other than a good two blade fixed pitch wooden prop,
> it is going to make a lot of racket, same, same our 912's with Warp
> Drive Props.
>
> What does Valley Redrive use for torsional vibration dampening?
>
> Bet you would see good results with the 912ULS gear box with slip
> clutch. I saw a lot of difference in vibration, during cruise
> especially, after I had the slip clutch installed on my 912ULS.
>
> Take care,
>
> john h
>
>
|
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_________________
ô¿ô
"Both optimists and pessimists contribute to the society. The optimist invents the aeroplane, the pessimist the parachute."
--- George Bernard Shaw |
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NeilsenRM(at)comcast.net
Guest
|
| Posted: Fri May 05, 2006 10:38 am Post subject: Rotax Relapse/VW Weight and Noise |
|
|
John/all
I have a three blade 72 inch F model Powerfin prop that turns 2000 RPM at
cruise. The redrive I have has no harmonic dampening in it other than the
dampening the Kevlar belts allow and that isn't much. Yes a rotax redrive
(or one of the two copies that are available for the VW) would be a good
addition.
The slipper clutch you talk about. You say it helps at cruise? I ASSUMED
that it was a centrifugal clutch that would lock up at high RPMs. Tell me
more about how it works.
Rick Neilsen
Redrive VW powered MKIIIc
---
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
|
| Posted: Fri May 05, 2006 12:25 pm Post subject: Rotax Relapse/VW Weight and Noise |
|
|
| The slipper clutch you talk about. You say it helps at cruise? I
ASSUMED
| that it was a centrifugal clutch that would lock up at high RPMs.
Tell me
| more about how it works.
|
| Rick Neilsen
No sir. One of those slipper clutches is the last thing I would want
to fly with on an airplane. They worked ok on my oldest brother's
Cushman motor scooter back in the 40's, and on my chain saw and weed
eater today. But don't think I want to go whizzing around in the air
with one.
Prior to the slipper clutch, the anti-torsional vibration dampening
was accomplished through a "dog and ramp" system under a lot of
pressure exerted by a number of very large domed spring washers. The
valleys, between the ramps were very narrow.
The slipper clutch uses a similar system with a few changes.
1-Valleys between ramps are much wider.
2-A multi-disk clutch pack which is spring loaded, is added to the
system. This clutch actually slips a little when necessary to assist
in dampening torsional vibration. Not only on start up and lower
speeds, but throughout the rpm range of the engine.
The slipper clutch works great. It needs to be inspected
periodically, like 400 to 500 hours. I need to fly down to Ronnie
Smith's and let him reshim mine to bring it back to specs if it has
loosened up enough to require the adjustment. Probably have to wait
until after MV before I will have time to get down there.
Hope this explain the difference between the slipper and the
centrifugal clutches.
john h
hauck's holler, alabama
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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