nos for airplanes?
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kevin mielke
- Posts: 25
- Joined: Thu Mar 23, 2006 23:52
- Location: Wasilla Alaska
nos for airplanes?
all legality's aside and just for fun, has anyone thought about NOS for there champ? seems it would be a perfect match as the cont motors are very low compression, and you would need less than a 10 second blast. extra 50hp for 10 seconds would be something
N82192 7CCM
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Nathan K. Hammond
- Posts: 2371
- Joined: Wed Nov 17, 2004 00:22
- Location: Danville, KY (DVK)
- Contact:
Jerry Burr did it on a J-3/PA-11. I want to say maybe 2lbs of boost or something like that. Check this link, it's got some KILLER info!!! Personally I like the idea, except for all the extra weight (bottle, lines, regulators, etc...)
http://www.supercub.org/phpbb2/viewtopi ... hlight=nos
nkh
http://www.supercub.org/phpbb2/viewtopi ... hlight=nos
nkh
7AC-5691
Super 85-12F @ DVK
Super 85-12F @ DVK
Hey, if some of those crashcar drivers can sneak it into the cars and not get caught, then bet someone could do the same with a Aeronca!
Sure would be nice on some heavy takeoff's but wonder about prop speed? With a constant speed prop it would be nice but bet with a fixed pitch prop it might not work out as well?
Joe
Sure would be nice on some heavy takeoff's but wonder about prop speed? With a constant speed prop it would be nice but bet with a fixed pitch prop it might not work out as well?
Joe
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Nathan K. Hammond
- Posts: 2371
- Joined: Wed Nov 17, 2004 00:22
- Location: Danville, KY (DVK)
- Contact:
Tip speed really wouldn't be a problem, it may get a little noisey though.
DANGER! DANGER! Math Ahead!
To produce max static thrust at full power, tip speed needs to be between .88 and .92 mach, and % mach is determined by the temp. To move between .88 and .92 mach takes around 110 to 120 RPM. (We'll use calculations for static thrust since thats what were really interested in; the hole shot.) So let's take a couple examples: first a 74" prop like that on a A65, then a 71" like on a C85.
All calculations will be figured at 60'F for simplicity.
dia. @ rpm = % mach
74" @ 2300 rpm = .665
74" @ 2500 rpm = .723
74" @ 2700 rpm = .780
74" @ 2900 rpm = .834
74" @ 3100 rpm = .896 Perfect
71" @ 2300 rpm = .638
71" @ 2500 rpm = .693
71" @ 2700 rpm = .749
71" @ 2900 rpm = .804
71" @ 3100 rpm = .860
71" @ 3300 rpm = .915 Perfect
The real concern would be internal cylinder pressures and engine speed. As CHT increases, so does the ICP, so you might want to run a base line test to make sure your not spikeing the engine. Engine RPM is the other concern, but the formula V guys have proven the engine can handle running at extreme speeds (3800+ rpm.) You do run into valve float at around 4100 rpm though
.
So, who's first?
nkh
DANGER! DANGER! Math Ahead!
To produce max static thrust at full power, tip speed needs to be between .88 and .92 mach, and % mach is determined by the temp. To move between .88 and .92 mach takes around 110 to 120 RPM. (We'll use calculations for static thrust since thats what were really interested in; the hole shot.) So let's take a couple examples: first a 74" prop like that on a A65, then a 71" like on a C85.
All calculations will be figured at 60'F for simplicity.
dia. @ rpm = % mach
74" @ 2300 rpm = .665
74" @ 2500 rpm = .723
74" @ 2700 rpm = .780
74" @ 2900 rpm = .834
74" @ 3100 rpm = .896 Perfect
71" @ 2300 rpm = .638
71" @ 2500 rpm = .693
71" @ 2700 rpm = .749
71" @ 2900 rpm = .804
71" @ 3100 rpm = .860
71" @ 3300 rpm = .915 Perfect
The real concern would be internal cylinder pressures and engine speed. As CHT increases, so does the ICP, so you might want to run a base line test to make sure your not spikeing the engine. Engine RPM is the other concern, but the formula V guys have proven the engine can handle running at extreme speeds (3800+ rpm.) You do run into valve float at around 4100 rpm though
.So, who's first?
nkh
7AC-5691
Super 85-12F @ DVK
Super 85-12F @ DVK
nos
You guys are out of control again 
Turbo is the best solution with cockpit adjustable waste gate. Hidden from view of course
Those hot muggy days no longer a problem. Short strips, feared no longer. Boost can be added if needed or run without boost for cruising. The hardest part would be controling yourself from over use, once you experience the hp gains. Blowing one engine up will help with self control
Ron
Turbo is the best solution with cockpit adjustable waste gate. Hidden from view of course Those hot muggy days no longer a problem. Short strips, feared no longer. Boost can be added if needed or run without boost for cruising. The hardest part would be controling yourself from over use, once you experience the hp gains. Blowing one engine up will help with self control
Ron
Before you believe anything I say, check with two more people. If they agree, I must be right.
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Eddie Wilson
- Posts: 15
- Joined: Thu Jul 28, 2005 19:35
- Contact:
NOS on a Champ
I dont know about NOS on a Aeronca!
But,
The Germans were the first to use Nitrous Oxide on airplanes during WWII. The had some birds that used it to increase power at high altitude instead of turbos and superchargers like the Americans. I have a seen Nitrous bottle ( huge) with Swastika stamped on it.
EWW
But,
The Germans were the first to use Nitrous Oxide on airplanes during WWII. The had some birds that used it to increase power at high altitude instead of turbos and superchargers like the Americans. I have a seen Nitrous bottle ( huge) with Swastika stamped on it.
EWW