Today's Message Index:
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1. 07:32 AM - Re: Re: Which Of Two STOL CH7XX Building Choices? (Jimbo)
2. 01:43 PM - 701/Corvair Info Request (Chris Kehoe)
3. 07:52 PM - Re: My lengthy, upbeat update. (PatrickW)
4. 09:05 PM - Re: 701/Corvair Info Request (Gig Giacona)
Message 1
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| Subject: | Re: Which Of Two STOL CH7XX Building Choices? |
NVH (noise, vibration and harshness, from the auto industry) standpoint is
another consideration that has nothing to do with performance.
My theory on this is that a three bladed prop on a four cylinder engine kee
ps the exhaust and propeller sounds out of phase, making it at least seem q
uieter. The same for vibrations. For a six, like the Jab 3300 or Corvair, t
hree blades would be worse than two for the same reason.
Jim LoBue
601XL/Corvair
--- On Fri, 10/24/08, Dirk Zahtilla <ideaz1@sbcglobal.net> wrote:
From: Dirk Zahtilla <ideaz1@sbcglobal.net>
Subject: Re: Zenith-List: Re: Which Of Two STOL CH7XX Building Choices?
Bryan gives an excellent explanation of prop
physics. In a prior plane I built I had an IVO 3 blade electric adjust prop
.
Because of the size and weight of the plane and engine many factors don't
applly. I did however have real world experience as I could in a few minute
s
switch from 3 to 2 blades. I also could adjust the pitch in flight to get m
ax
efficiency at any time, i.e. climbing or-cruise. The results were that 3
blades were a bit quieter and smoother (less vibration) and climb was impro
ved.
With 2 blades top level speed was about 3-4% higher, but of course climb
suffered a bit. Remember I was able to adjust the pitch at will so as to ge
t the
most of the prop in any conditions, so theres no question of making a bad c
hoice
of pitch.
-
I preferred the 3 blades for my use as the climb
and smoothness was more important to me than a slight speed
improvement.
The differences were subtle but
noticeable.
-
Dirk Z
Message 2
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| Subject: | 701/Corvair Info Request |
Would those building and/or flying a 701 with the Corvair engine PLEASE
post some updated info on how things are progressing? PLEASE? Thank you.
Message 3
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| Subject: | Re: My lengthy, upbeat update. |
Great update, Rich!
I remember when you & I met at Corvair College #11 at Cloverdale, and how I was
really struck by how much "in common" our building experiences were. Seeing
your progress is like looking a bit into the future at what awaits me. :D
Hearing of your progress is very exciting!
- Pat
--------
Patrick
601XL/Corvair
N63PZ (reserved)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=210302#210302
Message 4
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| Subject: | Re: 701/Corvair Info Request |
Too my knowlwdge there is only one 701 flying with a Vair.
You can get info here.... http://flywithgus.com/page4.html
and here.. http://www.flycorvair.com/
[quote="bigeagle(at)telus.net"]Would those building and/or flying a 701 with the
Corvair engine PLEASE post some updated info on how things are progressing?
PLEASE? Thank you.
> [b]
--------
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=210309#210309
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