Author: "steve zicree" <szicree@...> Time: Sat Dec 4, 2004 1:58 pm PST Link
Here's a dumb question for all the experienced guys: Is a wood prop any more likely to fail than a metal one? I've planned on using a wood prop on my 4 since I don't fly in rain, live in SoCal, and I love the look of them, but I'm concerned about that thing coming apart in flight. Does this ever happen? I mean, we've all seen glue joints on furniture, boats, guitars, etc. go bad, so I'm wondering if this is a real concern on props. Thanks for the input.
Steve Zicree
----- Original Message -----
From: Dave Cordner
To: vansairforce@yahoogroups.com
Sent: Saturday, December 04, 2004 6:46 AM
Subject: Re: [VAF Mailing List] New Andair fuel selector
Curious, why wouldn't Edlebrock carberator Banjo
fittings work? $20 at checker auto
<snip>
> > guess if it would work or not?
> >
> > This may avoid the expensive banjo fittings.
> However, since ordering
> > direct from Andair is more expensive than Van's
> this may be a wash.
Dave
Left wing off the jig, onto the right!
N898DC rsvd
RV7A
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Author: "Wayne Sweet" <w_sweet@...> Time: Sat Dec 4, 2004 5:24 pm PST Link
Just check the torque on the prop bolts "often". My friends RV-4 "lost" a wooden prop just after he sold it due to that issue.
Wayne
----- Original Message -----
From: steve zicree
To: vansairforce@yahoogroups.com
Sent: Saturday, December 04, 2004 12:50 PM
Subject: [VAF Mailing List] Wood Props
Here's a dumb question for all the experienced guys: Is a wood prop any more likely to fail than a metal one? I've planned on using a wood prop on my 4 since I don't fly in rain, live in SoCal, and I love the look of them, but I'm concerned about that thing coming apart in flight. Does this ever happen? I mean, we've all seen glue joints on furniture, boats, guitars, etc. go bad, so I'm wondering if this is a real concern on props. Thanks for the input.
Steve Zicree
----- Original Message -----
From: Dave Cordner
To: vansairforce@yahoogroups.com
Sent: Saturday, December 04, 2004 6:46 AM
Subject: Re: [VAF Mailing List] New Andair fuel selector
Curious, why wouldn't Edlebrock carberator Banjo
fittings work? $20 at checker auto
<snip>
> > guess if it would work or not?
> >
> > This may avoid the expensive banjo fittings.
> However, since ordering
> > direct from Andair is more expensive than Van's
> this may be a wash.
Dave
Left wing off the jig, onto the right!
N898DC rsvd
RV7A
__________________________________
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Author: "Bob & Lucille Olds" <oldsfolks@...> Time: Sun Dec 5, 2004 5:02 am PST Link
As stated above - check the torque @25 hrs to 50 hrs. If the varnish
finish starts to crack or peel,then sand and refinish. Water getting
into the wood would be what causes failed glue joints. I just
refinished mine and it looks like new again.
I read the torque required to turn the bolts just before they reach
bottom of the threads and add this to the proper torque for the prop
bolts. Mine need 5 ft/lbs added.
My Pacesetter wood prop has urethane leading edge and resists
rain,sand,gravel,etc. very well.
Bob Olds RV-4
Charleston,Arkansas
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Author: linn walters <lwalters2@...> Time: Sun Dec 5, 2004 5:03 am PST Link
steve zicree wrote:
>Here's a dumb question for all the experienced guys: Is a wood prop any more likely to fail than a metal one?
>
The true answer can only come from a search of the accident files, and
I'm not going to do that. IMHO, though, the answer is no.
> I've planned on using a wood prop on my 4 since I don't fly in rain, live in SoCal, and I love the look of them, but I'm concerned about that thing coming apart in flight.
>
I would be just as concerned of a metal prop. I KNOW they've come apart!!!
> Does this ever happen?
>
I suppose it can. Aviation has very few absolutes.
> I mean, we've all seen glue joints on furniture, boats, guitars, etc. go bad, so I'm wondering if this is a real concern on props.
>
It wouldn't be for me. Properly maintained, wood props, in some
applications, are better than metal. Depends on the mission, I guess.
Wood props are more flexible and a little FOD on the taxiway can make
them ugly, but you look at your prop a lot more often and a lot more
carefully than glue joints in your furniture! Delamination in a wood
prop will be immediately apparent .... and when water finds it's way
beneath the varnish, the wood will turn grey from moisture ..... well,
it's very obvious. Won't come apart unless you just ignore the problem
for an extended period of time. Composite props seem to have
delamination problems more than wood ones though. Maybe age of the
technology has a bearing??? ;-) .
> Thanks for the input.
>
Glad to. Go with what your desires are. I've seen wood props after
running through hail that looked like a golf ball but a little body
putty, some sanding and paint ..... and a balance job ...... and they
look and perform like new again. Wood props are more forgiving of FOD
than metal props that are subject to fatigue and stress cracking.
Linn
>Steve Zicree
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Author: "Brent Travis" <btravis@...> Time: Wed Dec 22, 2004 7:04 pm PST Link
Steve,
I have an Aymar Demuth prop that I am very happy with. Wood props have a
long history in aviation, starting somewhere around 101 years ago. They are
well known, and if treated correctly give excellent service. You have to
watch out for UV damage, so keep it covered if stored outside, or hanger it
(my choice). Then, since wood is permeable, the cells in the wood to expand
and shrink with changes in the wood moisture content. For instance, in the
winter here we get a lot of rain/snow, humid weather around freezing. In
the summer it is 90 F, and dry. I take the spinner off faithfully 2 to 4
times per year, whenever there are weather pattern changes and torque the
prop bolts. You should also be sure that the finish stays intact on the
prop, and that may mean repainting on a sporadic basis depending on how much
rain you fly through.
I've had the prop 3 years, 300 hours, and just refinished it. It looks
good, works great, light and simple. It has low vibration because wood
absorbs it. The advantages to metal are that you torque it once, and don't
really have to worry about it. I slow down in the rain with my prop to keep
the finish on; with metal it doesn't matter as much. And of course, you
should get a better climb rate with a constant speed, and you can slow the
plane down in the pattern a lot faster.
As far as performance goes, my plane likes my prop. 22-2500 fpm climb, 224
TAS on O-360 180 hp. I've outrun every other RV I've flown with. I'm sure
there are some faster ones out there, but I usually plan on 165 to 170 K
cruise speed on 8 gph, so I fly it like a O-320 most of the time.
I think the key to a wood prop is that you need to pay attention to it and
maintain it properly.
Brent Travis
N999BT
RV-4, Flying
_____
From: steve zicree [mailto:szicree@adelphia.net]
Sent: Saturday, December 04, 2004 12:51 PM
To: vansairforce@yahoogroups.com
Subject: [VAF Mailing List] Wood Props
Here's a dumb question for all the experienced guys: Is a wood prop any more
likely to fail than a metal one? I've planned on using a wood prop on my 4
since I don't fly in rain, live in SoCal, and I love the look of them, but
I'm concerned about that thing coming apart in flight. Does this ever
happen? I mean, we've all seen glue joints on furniture, boats, guitars,
etc. go bad, so I'm wondering if this is a real concern on props. Thanks for
the input.
Steve Zicree
----- Original Message -----
From: Dave Cordner
To: vansairforce@yahoogroups.com
Sent: Saturday, December 04, 2004 6:46 AM
Subject: Re: [VAF Mailing List] New Andair fuel selector
Curious, why wouldn't Edlebrock carberator Banjo
fittings work? $20 at checker auto
<snip>
> > guess if it would work or not?
> >
> > This may avoid the expensive banjo fittings.
> However, since ordering
> > direct from Andair is more expensive than Van's
> this may be a wash.
Dave
Left wing off the jig, onto the right!
N898DC rsvd
RV7A
__________________________________
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