I'm just going to leave this right here

[Wild Bill Kelso]

[toldjaso]

Re: I'm just going to leave this right here

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Nice photo shop job!

[N22252]

Re: I'm just going to leave this right here

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Is there a reward if somebody finds it out on the course somewhere?

[1:1 Scale]

Re: I'm just going to leave this right here

Won't that make for a lot of stops on the way to Reno to top off the boiler?

[jarrodeu]

Re: I'm just going to leave this right here

Well let's analyze this. Some people have questioned whether or not the mustang has the capacity for the liquids required for a boiler. Throw in a Griffon and that would make it even more difficult. In the past, Wild Bill has had other ideas for cooling.

Jarrod

[Leo]

Re: I'm just going to leave this right here

Was the boiler in GG NOT working out?
I never heard much about cooling issues.

[Race5]

Re: I'm just going to leave this right here

Was the boiler in GG NOT working out?
I never heard much about cooling issues.

GG Never completed a race at full race power. No way to know if it would have run out of fluid like many suggested.

[L.E.D.]

Re: I'm just going to leave this right here

Well, let's see.. Pete Law has written that a Merlin/Griffon rejects about 35% of shaft horsepower as heat that has to be extracted from the coolant and oil. Figure something like 300bhp at cruise, and that means 105bhp, or about 4400 BTU/min of heat to remove. Pete goes on to say that ADI/Water boiler takes away 5900BTU/gal so:

4400BTU/min / 5900 BTU/gal = 0.75 gal/min of ADI through the boiler, or 44 gal/hr. A mustang at economy cruise uses about that much fuel, so you could put 90 gallons of fuel in one wing and ADI in the other and have about 1.5 hour endurance with a half hour reserve.

Pretty rough but it jibes with a recollection that Stiletto needed to stop about as often for ADI as gas when being ferried.

[johnnyrace]

Re: I'm just going to leave this right here

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Mmmmm...Yummy

[Race 29]

Re: I'm just going to leave this right here

Would it be possible for Precious Metal to use the same NACA duct that Miss Ashley II used to reduce drag from the scoop? I seem to remember someone saying that the attachment points on the Lear wing of MA II allowed that setup, but wouldn't work with a "standard" Mustang wing. Thoughts? Either way, I hope that whatever mods they're working on can add some more speed to an awesome racer! Go Precious Metal!!

Race 29

[FlyKidChris]

Re: I'm just going to leave this right here

Well, let's see.. Pete Law has written that a Merlin/Griffon rejects about 35% of shaft horsepower as heat that has to be extracted from the coolant and oil. Figure something like 300bhp at cruise, and that means 105bhp, or about 4400 BTU/min of heat to remove. Pete goes on to say that ADI/Water boiler takes away 5900BTU/gal so:

4400BTU/min / 5900 BTU/gal = 0.75 gal/min of ADI through the boiler, or 44 gal/hr. A mustang at economy cruise uses about that much fuel, so you could put 90 gallons of fuel in one wing and ADI in the other and have about 1.5 hour endurance with a half hour reserve.

Pretty rough but it jibes with a recollection that Stiletto needed to stop about as often for ADI as gas when being ferried.

Excellent post.

[Race5]

Re: I'm just going to leave this right here

Would it be possible for Precious Metal to use the same NACA duct that Miss Ashley II used to reduce drag from the scoop? I seem to remember someone saying that the attachment points on the Lear wing of MA II allowed that setup, but wouldn't work with a "standard" Mustang wing. Thoughts? Either way, I hope that whatever mods they're working on can add some more speed to an awesome racer! Go Precious Metal!!

Race 29

I believe it was the landing gear positing that allowed it on MA II. There isn't room for that scoop / ducting design on a "stock" Mustang wing / fuselage.

[L.E.D.]

Re: I'm just going to leave this right here

Would it be possible for Precious Metal to use the same NACA duct that Miss Ashley II used to reduce drag from the scoop? I seem to remember someone saying that the attachment points on the Lear wing of MA II allowed that setup, but wouldn't work with a "standard" Mustang wing. Thoughts? Either way, I hope that whatever mods they're working on can add some more speed to an awesome racer! Go Precious Metal!!

Race 29

I'll play reference librarian on this... there was a discussion here;

http://www.aafo.com/hangartalk/showthread.php?11448-Aerodynamic-modifications/page6

.. on MAII's modified belly scoop. The summary was that that:

a) MAII's implementation wasn't a pure NACA scoop
b) NACA scoops aren't ideal for radiators
c) Quoth Wild Bill "No NACA Scoop for PM; I hate the abuse of NACA scoops" =)

The trick to reducing the drag of a radiator installation is to slow the inlet air down as much as you can to reduce drag as it goes through the radiator and and speed it back up again as it goes out. This requires a lot of diffusion, which, according to NACA ACR-5I20, the submerged "NACA Duct" isn't very good at. From the tech doc:

http://naca.central.cranfield.ac.uk/reports/1945/naca-acr-5i20.pdf

"Submerged inlets do not appear to have desirable pressure recovery characteristics for supply to oil coolers, radiators or carburetors of conventional reciprocating engines."

P.S. nothing you can do pushing air through a radiator is going to have less drag than no radiator at all - the surface area of a radiator is on the same order as the wing area, and it's just gonna make drag.

[Wild Bill Kelso]

Re: I'm just going to leave this right here

Right now we would happy getting rid of the oil cooler drag. But I guess we have too many BTU's to get rid of to use a H-model heat exchanger that Voodoo and Strega use.

[Samuel]

Re: I'm just going to leave this right here

Looks like the engine is going to be a winner

http://www.ace-performance.com/ace-b.../#post_content