Today's Message Index:
----------------------
1. 05:59 AM - how much dope for wing? (Douwe Blumberg)
2. 06:14 AM - Re: how much dope for wing? (Michael D Cuy)
3. 06:16 AM - Re: Corvair Crank (Hans Vander Voort)
4. 06:46 AM - Re: Re: wing spar question (Bill Church)
5. 07:04 AM - Re: Re: wing spar (Hans Vander Voort)
6. 12:25 PM - hvlp sprayers (Douwe Blumberg)
7. 12:35 PM - Re: hvlp sprayers (Hans Vander Voort)
8. 12:47 PM - Re: hvlp sprayers (Michael Turrell)
9. 03:32 PM - Re: Re: wing spar question (gcardinal)
10. 11:10 PM - Re: Corvair Crank (Philip Miller)
Message 1
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| Subject: | how much dope for wing? |
Hey guys,
I am using old fashioned dope on my Piet. Does anyone have an idea of how much
colored Butyrate I'll need for the wings and tail surfaces?
My ceconite manual tells me I'l need about eight gallons for the whole plane, but
it doesn't break it down. I'm assuming 75% of that would go on the wings and
tails?
Douwe
Message 2
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| Subject: | Re: how much dope for wing? |
--> Pietenpol-List message posted by: Michael D Cuy <Michael.D.Cuy@grc.nasa.gov>
Douwe-- I used Randolph pigmented butyrate dope (thinned clear nitrate dope
first.....then silver butyrate coats)
and 8 gallons sounds just right. I got 5 gallons of white and 5 gallons of
blue and used about 8 total gallons.
I used non-taughtening dope with CAB thinner.
Mike
Message 3
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| Subject: | Re: Corvair Crank |
--> Pietenpol-List message posted by: Hans Vander Voort <hans.vander.voort@alfalaval.com>
Glenn,
Crankshafts have failed in Corvair cars also.
But this seems mostly on high HP racing applications.
The airplane use of the Corvair engine will produce stress on a crankshaft
not found in Cars.
These stress issues are not unique to Corvair, Lycoming has had a number of
AD lately related to crankshaft failures And these are purpose build
airplane engines.
It seems the stress cracks appear in the Corvair engine applications in KR
2 and Zenair 601, none are yet found in Pietenpol applications.
But it seems no one has looked at Pietenpol crankshafts either.
As flight profiles are different between KR2 and Pietenpol it is fair to
assume the stress on the crank will be different to.
There are a lot more Pietenpols flying with Corvair engines than KR2's and
Zenair combined and a lot of them with 600+ hours and no Crank failures.
I would like to see some, 200+ hour, Pietenpol corvair cranks evaluated.
None the less I intend to get another crankshaft, and have it nitrated, it
is cheap insurance.
In the mean time I will fly my old crankshaft, I have only 25 hours on the
engine and I am still within the 40 Hour test period.
I believe as part of the service William Wynne provides, on modifying the
crankshaft, a inspection (and nitrating) is included.
But please check with him.
Hans
"Glenn Thomas"
<glennthomas@char
ter.net> To
Sent by: pietenpol-list@matronics.com
owner-pietenpol-l cc
ist-server@matron
ics.com Subject
Pietenpol-List: Corvair Crank
01/19/2006 10:23
PM
Please respond to
pietenpol-list@ma
tronics.com
--> Pietenpol-List message posted by: "Glenn Thomas"
<glennthomas@charter.net>
I got hooked on the idea of the affordable Corvair motor and bought 2 of
them, the William Wynne conversion manual and a couple of WW's videos and I
visit his website a couple times a week. Then last week, he posted new
information regarding nitrided crankshafts and I'm trying to find out if
anyone knows if these stress fractures and cracks that he's found are ever
found in an engine straight out of a car. I'd like to continue with the
Corvair motor but his article states that the Embry-Riddle magnaflux
machine he used to see the cracks revealed a lot more than the typical
automotive magnaflux usually does. ...so my question is if I send him the
best of my 2 to have the safety shaft installed and grinding, and
nitriding, how do I know the shaft I'm sending is free of cracks, even if I
get a clean bill of health from the place that will do my magnaflux on the
2 of them. This is one of those areas I don't know that much about and I'm
hoping someone else does. If the crack!
s are something that appear only as a result of spinning a prop then I'll
just have the crank I use nitrided.
Anyone ever heard of a Corvair crankshaft failure (nitrided or otherwise?)
Thanks,
Glenn Thomas
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=5405#5405
Message 4
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| Subject: | Re: wing spar question |
--> Pietenpol-List message posted by: "Bill Church" <eng@canadianrogers.com>
Steve,
You might want to check out Jim Markle's well documented Piet project on
Mykitplane.
Jim has built his spars from marine ply and Douglas Fir. See it here:
http://www.mykitplane.com/Planes/buildLogReport.cfm?PlaneID=52
Bill
-----Original Message-----
From: owner-pietenpol-list-server@matronics.com
[mailto:owner-pietenpol-list-server@matronics.com] On Behalf Of Steve
Glass
Sent: January 19, 2006 12:01 PM
Subject: RE: Pietenpol-List: Re: wing spar question
--> Pietenpol-List message posted by: "Steve Glass"
--> <redsglass@hotmail.com>
Hi Everybody.
I have been lurking on the list and decided to jump in and ask a
question about the spars.
I think the original design is great. I also think it makes sense to
use modern materials such as epoxy where it makes sense. I know there
is a builtup spar that has been designed for the wing.
I have been in the yacht building business for 30 years and know that
good wood is getting more difficult to find and more expensive. When I
build mine I will feel more confident in building the spar with spruce
caps and a ply web. Has anybody gone this route, compared finished
weights etc.
Thanks in advance.
Steve G.
Message 5
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Routed Spars ?
Bird Flue affecting the commercial airliners
(Embedded image moved to file: pic00912.gif)[]
Message 6
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Hey,
I'm getting ready to start spraying dope and am looking at the hvlp systems because
they use less material.
I am wondering if the extra heat the turbine produces will cause problems with
cooking off the thinner in the dope.
also, it seems like there are hvlp guns that use a regular compressor instead of
a turbine, which would then not be a problem
???
D
Message 7
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| Subject: | Re: hvlp sprayers |
--> Pietenpol-List message posted by: Hans Vander Voort <hans.vander.voort@alfalaval.com>
Douwe,
I used a turbine HVLP system for spraying Poly-Fiber covering system.
There is a temperature increase which will have the thinners evaporate
quicker and leaving a dull(er) finish. (poly-fiber is not glossy to begin
with)
Recommend you extend to air hose with at least an additional 12 - 20 feet.
This will give the air time to cool plus you have more reach.
Hans
"Douwe Blumberg"
<douweblumberg@ea
rthlink.net> To
Sent by: "pietenpolgroup"
owner-pietenpol-l <pietenpol-list@matronics.com>
ist-server@matron cc
ics.com
Subject
Pietenpol-List: hvlp sprayers
01/20/2006 02:24
PM
Please respond to
pietenpol-list@ma
tronics.com
Hey,
I'm getting ready to start spraying dope and am looking at the hvlp systems
because they use less material.
I am wondering if the extra heat the turbine produces will cause problems
with cooking off the thinner in the dope.
also, it seems like there are hvlp guns that use a regular compressor
instead of a turbine, which would then not be a problem
???
D
Message 8
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| Subject: | Re: hvlp sprayers |
Hey,
I'm getting ready to start spraying dope and am looking at the hvlp systems because
they use less material.
I am wondering if the extra heat the turbine produces will cause problems with
cooking off the thinner in the dope.
also, it seems like there are hvlp guns that use a regular compressor instead of
a turbine, which would then not be a problem
I have both and if you already have a compressor I would go with the hvlp spray
gun as it is cheaper and works better than my turbine sprayer but then I only
spent a couple hundred dollars for mine and a real good one will set you back
$500 and up .My HVLP spray gun is a gravity feed unit and It does indeed save
a ton of material compared to when I used a regular high pressure gun.I think
it is worth getting a good name ,devilbiss or similar because if you buy some
of the cheap ones you will find there is not much to them and rust becomes your
first clue that all is not right and setting a spray pattern that you want
is another.
As to the heat from the turbine it would not be an issue as your fluid comes out
of a suction feed gun and does not come near any heat produced by the turbine.
Hope this helps.
Regards,Mike
Message 9
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| Subject: | Re: wing spar question |
--> Pietenpol-List message posted by: "gcardinal" <gcardinal@mn.rr.com>
Steve,
Send me a self addressed, stamped envelope and I will send you an article on
designing built-up spars. The article was published in Sport Aviation in the
early 1960's.
My address is:
Greg Cardinal
5236 Shoreview Ave. So.
Minneapolis, MN 55417
----- Original Message -----
From: "Steve Glass" <redsglass@hotmail.com>
Sent: Thursday, January 19, 2006 10:43 AM
Subject: RE: Pietenpol-List: Re: wing spar question
> --> Pietenpol-List message posted by: "Steve Glass"
> <redsglass@hotmail.com>
>
> Hi Everybody.
>
> I have been lurking on the list and decided to jump in and ask a question
> about the spars.
>
> I think the original design is great. I also think it makes sense to use
> modern materials such as epoxy where it makes sense. I know there is a
> builtup spar that has been designed for the wing.
>
> I have been in the yacht building business for 30 years and know that good
> wood is getting more difficult to find and more expensive. When I build
> mine I will feel more confident in building the spar with spruce caps and
> a ply web. Has anybody gone this route, compared finished weights etc.
>
> Thanks in advance.
>
> Steve G.
>
>
> http://www.matronics.com/Navigator?Pietenpol-List
>
>
>
Message 10
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| Subject: | Re: Corvair Crank |
If you want all the scoop on Corvairs, go to their list and sign up:
search the CorvAircraft archives at http://www.maddyhome.com/corvairsrch/index.jsp
to UNsubscribe from CorvAircraft, send a message to CorvAircraft-leave@mylist.net
Other CorvAircraft list info is at http://www.krnet.org/corvaircraft_inst.html
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