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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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 Posted: Thu Oct 05, 2006 6:32 am Post subject: Prop Extensions (changed the subject line to reflect content |
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That also concerns me in the coming and the going: full throttle at
takeoff and pull power to land! Smack, smack, smack coming from behind
me doesn't excite me in the least. Now I question as to 5" spacer
(which adds some of its own problems),
| Live and learning here in Ohio Ralph!
Ralph:
Flying with an IVO or Warp or any other flexible prop blade is not the
problem with clearance, as I see and have experienced with my mkIII
and Warp Drive. As I mentioned in my last post, the problem occurs on
start up and shut down. This is the time there is not enough
centrifugal force to keep the blades under control, thus the
requirement for a prop extension to maintain adequate clearance.
The extension, I believe, that is required is the 4", not a 5"
extension. Maybe you are thinking of 5" clearance.
I don't know of any problems using prop extensions on Rotax gear
boxes. Like Jack Hart mentioned, the bolts are not in shear if
properly torqued. Bolt heads don't normally pop off and prop bolts
don't get sheared from the "massive" power of our engines.  I
have had prop bolts break, but never more than one at a time, and very
isolated instances. Can't remember the last time I lost one.
As for changes in aircraft performance characteristics, the only
noticeable change I noticed in my airplane was reduction of noise.
Not at all quiet, but not quite as noisy when the prop got a little
space between it and the wing.
I did a lot of experimenting, many years ago, with the FS, changing
thrust line of the engine, up, down, left and right. Even
experimented with the 912's and the MKIII by raising the front of the
engine to bring the thrust line parallel with the bottom of the wing,
knowing this angle would change a little when the engine was producing
thrust. Have made extremely long cross country flights, i.e., Alaska,
with the engine in the stock and front raised positions. Could not
detect any noticeable difference in performance, and/or trim.
Trim problems associated with Kolb aircraft, in my humble opinion, are
caused by the way the prop wash hits the tail section, especially yaw
problems. Best solution I have found is a large enough trim tab to
off set the adverse yaw. It works for me now. Pitch down problems
are caused by the high thrust line and power.
Take care,
john h
mkIII
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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Ralph Hoover
Joined: 09 Jan 2006
Posts: 206
Location: Central Ohio
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| Posted: Thu Oct 05, 2006 3:00 pm Post subject: Re: Prop Extensions (changed the subject line to reflect con |
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Yes John, I misstated their (IVO's) information. They did say 'clearance".
Maybe I am making too much of this issue and I apologies for taking it too far. It just seems to me that if a prop is made to do a job, you really shouldn't need to somehow offset for their products deficit unless forewarned in advance.
I was always under the impression that on an airplane, two things are at a premium: weight and space. Both appear to be violated here and someone is getting arrested immediately! Where are the air police when you need them? Ha, HA!
Ohio Ralph
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