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Next D . Fast Lad Performance . Ace Hobby

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Main Discussion > Turbo on a heli
 
 
Alistair
Key Veteran
Location: no where land

megaloaf. let it go. you are just making stupid talk now. who said heat was good? christ.

ahhh it's just a bit of jealousy... lol

again, i didn't teach them shiite. i just said the fury is not bullet proof. i think your skull is thicker than a monkeys.

KC.... what is your fooking problem with me in the past year? i haven't done anything to you. i hardly ever even cross paths with you. the last time was at the field 'fore i left, and the time 'fore that was at a FF like 2 months prior.

Quote 
"all in one"


hahaha i like it. you are trying to be witty.

squigle
11-24-2004 09:34 PM
 
 
Furious Predator
Elite Veteran
Location: Kitchener, Ontario, Canada

i'm waiting for someone to say
JERRRY JERRRY JERRRY JERRRY!!!!

Shawn
Team Leisure-Tech
Cratering the earth one heli at a time
11-24-2004 09:43 PM
HOMEPAGE  
 
 
Alistair
Key Veteran
Location: no where land

i already called him... he's setting it up

squigle
11-24-2004 10:14 PM
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

Alistair, KC knows "power" you won't BS him either. He also knows you,as others here have had the misfortune of flying with you, so do be carefull what you claim to be true. Yes, you HAVE made some friends over in the MA forum.
11-25-2004 01:15 AM
 
 
Alistair
Key Veteran
Location: no where land

no KC knows of me. he does not know me.

piss off.

power... hahahahaha uh huh. what power would that be.

KC also has a problem with actually saying things to me. he'll say tons of things on here, but in person, he usually won't say anything of the sort.

i assume that is something like you.

ooooooo big big man.

anyways, go bother someone else.

or go play with KC. you guys can share your power. tell him your megaloaf is coming his way.

squigle
11-25-2004 06:44 AM
 
 
Branzzz
Veteran
Location: Singapore

yup...was thinking about the effects of heat too...wondering if the large mass of incoming air would be enough to offset the amount of heat gained? how much heat does onrushing air absorb when flowing past a heli cylinder head running at lets say hovering power?

Raptor 50V2
OS 50SX-Hyper
GY502/9253
Hitec 6975
Airtronics ERG-VB
JR 3810
11-25-2004 11:43 AM
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

Never really measured it, but it's warmer than outside air, proving that some cooling does take place. When a turbocharger or supercharger compress, they add heat to the incoming air charge, so lowering the air density. This is where much of the inefficiency comes from. We use intercoolers downsteam of the super/turbocharger to cool the incoming air charge . The colder the air, the denser, the more power with lower actual boost recorded. I'm building a pair of Chevy marine engines now for a customer. Two 540 cubic inch motors, supercharged and intercooled making just over 850hp each at 5psi of boost, and 5700rpm. That is some efficient power. They will also run all day at that power output. One of the BIG downfalls of exhaust driven turbochargers, is the fact that the exhaust heat adds to the compressors heat, making for much lower efficiency. Belt driven, intercooled superchargers are the way to go in the REAL world of today. 91 octane fuel.
11-25-2004 12:13 PM
 
 
Branzzz
Veteran
Location: Singapore

cool...have you worked on any engines that were both super and turbo charged? i remember the most powerful aircraft piston engine ever made(a B29 engine) used super-turbocharging...or was it tubo-supercharging?

Raptor 50V2
OS 50SX-Hyper
GY502/9253
Hitec 6975
Airtronics ERG-VB
JR 3810
11-25-2004 07:39 PM
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

Never both on the same motor. In the B29's day, the quest was to feed very large piston motors at altitude. Some good info at this site www.procharger.com. I'm using these now, as they are one of the top marine performers.
11-25-2004 07:56 PM
 
 
Crusty
Senior Heliman
Location: N51 degrees 29.823 minutes W3 degrees 16.133 minut

In the b29 wright turbo-compound, power was taken from the exhaust turbos shaft and fed back into the power train, the turbo wasnt used, just as a compressor power source.
It had no supercharger

I am dsylexia of borg..resistance is fruity...your arse will be laminated
11-25-2004 08:38 PM
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

Thanks Crusty!
11-25-2004 08:47 PM
 
 
Alistair
Key Veteran
Location: no where land

Quote 
Belt driven, intercooled superchargers are the way to go in the REAL world of today. 91 octane fuel.


no........ it's not....... it is cheaper though.

likely the air from the heli engine would be pretty warm. so it may almost require an aftercooler on the large engines to be efficient enough to make it worth it.

t'would be a lot of plumbing though...

squigle
11-25-2004 10:08 PM
 
 
Imperio
Senior Heliman
Location: tecumseh okla 7487 ph405-598-6267

B29 Bomber

Any engine that is a recip even a desiel has to have some sort of turbo charger or super charger to operate at 18'000Ft or higher because of the loss in pressure and air density. in other word's the out put is so low it's not usable unless you boost the intake manifold pressure cause it can not get enough air. check this out i am putting a generator back on a B29 that cought fire at this generator cause it locked up and because the dam generator case is made out of magnsesium it burned like a bitch. this time i machined a groove all the way around the generator input shaft that way if it lock's up again instead of causeing a fire it will shear off the shaft at the groove that i have machined all the way round the darn shaft. who build's crap like this that has no safety built in so if bite's the dust it does not burn down the whole dam plane! oh yeah get this did i mention the generator housing is made from magnesium i mean could the fire be any worst? what a mess any way i have all of it back together now and everthing cleaned and repaired this big tub of airplane belong's the the Confderate Air Force. some time's i wish they would fire my ass so i would not have to clean up a mess like this seem's to happen all the darn time.
11-25-2004 10:11 PM
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

You're right. The ProChargers I'm using in my current project are $5700 each motor, another $2500 each motor for the fuel injection. Dirt cheap, for sure.
11-25-2004 10:13 PM
 
 
Alistair
Key Veteran
Location: no where land

actually, that is cheap to what i am used to.

squigle
11-25-2004 10:26 PM
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

I know you have the biggest, best, loudest, most expensive, etc. I wouldn't expect anything less. But before you impress me, you need to work for it, and build it yourself. Spoiled brats are a dime a dozen.
11-25-2004 10:31 PM
 
 
Furious Predator
Elite Veteran
Location: Kitchener, Ontario, Canada

This is getting old

Shawn
Team Leisure-Tech
Cratering the earth one heli at a time
11-25-2004 11:17 PM
HOMEPAGE  
 
 
Alistair
Key Veteran
Location: no where land

work for it and build it myself... you have no idea.

never said anything 'bout the biggest and the best. homoligated parts have a high cost. that's all there is too it. they're very good, but are pricey.

why don't you just put a jet turbine in your boat?

speed

install some hydro-foils too

squigle
11-26-2004 01:35 AM
 
 
Furious Predator
Elite Veteran
Location: Kitchener, Ontario, Canada

While we are going off into different tangents...

I have been wanting to design and build my own mini turbine engine. I pretty much have my engine built in 3D CAD solid modeling, but i have small problems. I need a way to make the turbine blades, and a way to pressurize the fuel, inject it, and control it.

I dont care how much power it produces, i just want to build a jet engine that works and runs under its own power. anyone have any ideas?

The CAD models i have are very simple representations, i wont do anything in great detail until i know what the blade profiles will be like and the fuel injection methods are.

Shawn
Team Leisure-Tech
Cratering the earth one heli at a time
11-26-2004 02:45 AM
HOMEPAGE  
 
 
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