Nord 1500 Griffon Project

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hinote
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Re: Starting a PJ

Post by hinote » Mon Jul 26, 2004 8:55 pm

Al Belli wrote:
I have several ideas on ground based starting systems, as well as having given some thought to in-flight re-starting. Ground based starting is simply a puff of air from an air tank, or from a blower. In flight re-starting will require some additional engineering for low weight and reliability.

Al Belli
Al, I don't think you're going to have much of a problem with in-flight restart--if you design the ductwork properly for normal engine operation.

These (valveless) engines respond to the increased pressure available from ram air recovery at higher speeds, with greater thrust output AND better fuel specifics. A properly designed (pressure-recovery) intake duct will ensure good airflow into and past the engine--and there will be plenty of air moving through the engine if a restart is necessary.

Bill H.
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Post by Mike Everman » Mon Jul 26, 2004 9:05 pm

I have to agree, it's a non-issue except for spark. I'm sure you could get one of those AAA units to go on only when the engine is off. Thrust could break the contact that gives it power(?)
Mike Often wrong, never unsure.
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Al Belli
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Griffon 1/5 scale with kentfield

Post by Al Belli » Tue Jul 27, 2004 10:44 pm

Hi,

This is a layout of a Kentfield with curved intake recuperators firing into an augmentor, in a 1/5 scale airframe.

Al Belli
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Post by milisavljevic » Tue Jul 27, 2004 11:42 pm

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Post by Mike Everman » Wed Jul 28, 2004 12:06 am

The more I delve into the acoustics of the "chinese" configuration, the more fascinated I get. I would hope that Al accepts this proposal ! It will be a wonderful thread to watch, and ultimately an easy configuration to build.
Mike Often wrong, never unsure.
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Al Belli
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Super chinese

Post by Al Belli » Wed Jul 28, 2004 12:30 am

Hi Milisavljevic,

Your description of the chinese-type modified pulsejet is very interesting. I would be quite interested in seeing Your layout and dimensions.

Thanks,

Al Belli
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Chinese Dimensions

Post by milisavljevic » Wed Jul 28, 2004 1:31 am

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Viv
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Post by Viv » Wed Jul 28, 2004 2:00 am

And then a little blackbird flew by a peck peck pecking.

I thought it was you.

Viv
"Sometimes the lies you tell are less frightening than the loneliness you might feel if you stopped telling them" Brock Clarke

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Monsieur le commentaire
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Post by milisavljevic » Sat Jul 31, 2004 3:25 am

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Al Belli
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Griffon engine

Post by Al Belli » Sun Aug 01, 2004 2:43 pm

Hi Milisavljevic,

I scaled the (Chinese) 2X, and put four in an array as shown. The total weight with augmentor/duct is 14 pounds. This is overlayed on a 1/5 Griffon, in the attachment. The augmentor also acts as a heat shield.

......O
..O.....O
......O

Thanks,

Al Belli
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Post by milisavljevic » Mon Aug 02, 2004 3:07 am

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Post by milisavljevic » Tue Aug 03, 2004 9:45 pm

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Post by Mike Everman » Tue Aug 03, 2004 10:00 pm

Hello, M.!
I see nothing on the first file(?) The second is fine. I may just have to build one too. I'll be happy to take data also.
Mike Often wrong, never unsure.
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Post by milisavljevic » Tue Aug 03, 2004 10:53 pm

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Post by Mike Everman » Tue Aug 03, 2004 11:04 pm

Is it this fine slip of a girl?
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