Today's Message Index:
----------------------
1. 12:55 PM - Reno Air Races (Gary Vogt)
2. 05:01 PM - Re: Reno Air Races (Bruce Smith)
3. 05:23 PM - Prop (Bruce Smith)
4. 08:26 PM - Re: Prop (Gary Vogt)
5. 09:06 PM - Re: Prop (Bob Hodo)
Message 1
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Just got back from the Reno Air Races. I'm always most interested in seeing
what the Formula planes and sport planes do for speed.
The first pic is a Glasair. He had the same engine (Lycon) as many other sport
planes. He was the last one around the track. I tried this cooling exit ramp.
It doesn't work.
The second pic is a wanna be NACA scoop. I really wanted to just write "See
NACA ACR No. 5120" on the plane.
The third pic is a throttle body inlet. Now, this guy did his homework.
I had to include this. The description says it's a V-3410. If you read the
book, Allied Aircraft Engines, you see it's a W-3410. 2600 hp.
Message 2
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| Subject: | Re: Reno Air Races |
Gary,
Very cool pics. I didn't get out to the races this year. Maybe next year.
Allison engines were cool. While not as highly regarded as the Merlin, they were
well designed and assembled. Allison went as far as taking the basic V-1710
and turbo-compounded it, naming it the V-1710-E22. Normal max power was 2300 hp
with over 3000 hp available for War Emergency. Shame it never came into service.
Would you explain what you like about that inlet?
Thanks.
Bruce Smith
On Sep 20, 2010, at 3:13 PM, Gary Vogt wrote:
> Just got back from the Reno Air Races. I'm always most interested in seeing
what the Formula planes and sport planes do for speed.
>
> The first pic is a Glasair. He had the same engine (Lycon) as many other sport
planes. He was the last one around the track. I tried this cooling exit
ramp. It doesn't work.
>
> The second pic is a wanna be NACA scoop. I really wanted to just write "See
NACA ACR No. 5120" on the plane.
>
> The third pic is a throttle body inlet. Now, this guy did his homework.
>
> I had to include this. The description says it's a V-3410. If you read the
book, Allied Aircraft Engines, you see it's a W-3410. 2600 hp.
>
> <IMG_0823.JPG><IMG_0824.JPG><IMG_0826.JPG><IMG_0829.JPG>
Message 3
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Gary,
Some years ago, and this may have been in the 1980s, I read an article in Machine
Design about a guy who patented a fixed pitch, constant speed propeller. He
was able to cause a "constant speed effect" by blowing air out slots machined
into the upper surface of the prop blades. This did require a hollow shaft on
his test motor and an air pump to pressurize the slots. Never heard anything
about that since. Remember anything from your Propulsion Engineer days?
It would seem to me that you might be able to dispense with the air pump and open
the front of the spinner to take advantage of the ram air effect. Might not
be perfect, but it might be a start.
Anyone else out there in Team Grumman land remember anything about this?
Thanks.
Bruce
Message 4
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I don't recall hearing about this. I'm not sure how it would work. Boundary
layer control is generally used to control flow attachment.
Do a google search and see if you can find anything.
30 years ago I was reading a Jane's book of planes. At the time, I was
designing a plane using a ducted fan. Damn if the Germans hadn't already done
that. Forward swept wings were the new thing. Damn if the Germans hadn't done
that too. If you have access to a complete set of Jane's going back to the
20's, odds are, it's been done.
________________________________
From: Bruce Smith <haveblue1@mac.com>
Sent: Mon, September 20, 2010 5:17:38 PM
Subject: TeamGrumman-List: Prop
Gary,
Some years ago, and this may have been in the 1980s, I read an article in
Machine Design about a guy who patented a fixed pitch, constant speed propeller.
He was able to cause a "constant speed effect" by blowing air out slots machined
into the upper surface of the prop blades. This did require a hollow shaft on
his test motor and an air pump to pressurize the slots. Never heard anything
about that since. Remember anything from your Propulsion Engineer days?
It would seem to me that you might be able to dispense with the air pump and
open the front of the spinner to take advantage of the ram air effect. Might not
be perfect, but it might be a start.
Anyone else out there in Team Grumman land remember anything about this?
Thanks.
Bruce
Message 5
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Gary, any chance that doing this at the root of the blade during take-off a
cceleration would reduce the work load on the prop inboard, allowing the en
gine to get the working outer half to higher rpms?- Kind of like controll
ing cavitation on a boat?- And if this IS what happens, the magic pixie d
ust could be tweaked even stronger strait and level, no?
Bob Hodo
--- On Mon, 9/20/10, Gary Vogt <teamgrumman@YAHOO.COM> wrote:
From: Gary Vogt <teamgrumman@YAHOO.COM>
Subject: Re: TeamGrumman-List: Prop
I don't recall hearing about this. -I'm not sure how it would work. -Bo
undary layer control is generally used to control flow attachment. -
Do a google search and see if you can find anything.
30 years ago I was reading a Jane's book of planes. -At the time, I was d
esigning a plane using a ducted fan. -Damn if the Germans hadn't already
done that. -Forward swept wings were the new thing. -Damn if the German
s hadn't done that too. -If you have access to a complete set of Jane's g
oing back to the 20's, odds are, it's been done.
From: Bruce Smith <haveblue1@mac.com>
Sent: Mon, September 20, 2010 5:17:38 PM
Subject: TeamGrumman-List: Prop
Gary,
Some years ago, and this may have been in the 1980s, I read an article in M
achine Design about a guy who patented a fixed pitch, constant speed propel
ler. He was able to cause a "constant speed effect" by blowing air out slot
s machined into the upper surface of the prop blades. This did require a ho
llow shaft on his test motor and an air pump to pressurize the slots. Never
heard anything about that since. Remember anything from your Propulsion En
gineer days?
It would seem to me that you might be able to dispense with the air pump an
d open the front of the spinner to take advantage of the ram air effect. Mi
ght not be perfect, but it might be a start.
Anyone else out there in Team Grumman land remember anything about=0A=0A=0A
=========================0A
=======0A=0A=0A=0A=0A
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