Allen's been working on the project for about 3 years.
From my jet performance spreadsheet:
The stabilised best rate of climb should be around 1100 feet/min at
100 knots or so. Depends on how much drag is generated by the jet
installation with engines extended.
600 feet in just over a minute after brake release sounds exactly
right. The engins burn around 0.8 liters a minute each so you'll get
to 1700 feet for about 4.8 liters of fuel. You'll be at 100 knots so
the pull up back to thermalling speed will get you to 2000 feet. Oh
yes, jet gliders will be fun to fly!
AMT jets now have a larger version of the engines Allen is using.
40Kg thrust instead of 23.5Kg. Only 17mm greater diameter and 11mm
longer and cost is only slightly higher than 3 of the smaller engines.
Mike
At 11:38 PM 13/04/2009, you wrote:
My father posted this on the WGC list and asked me to also put it on
this one. He is speaking of Allen Hudson at Waikerie. For those of
you that don't know, Allen has been working on a project for the
last year (I think, someone correct me if need be) of putting three
jets on an ASW20. He has it mounted in a sort of triangle
configuration above and behind the canopy, with the middle jet being
fixed, and the two side jets hide-away.
I've seen it run, but not fly, and I can say, even not moving it is
rather impressive. Hopefully someone will have some good pictures
which, with Allens blessing, I (or someone else) can post/link here.
Anyhoo, here's the message from Nigel Baker:
------------------------------------------------------------------------------------------------------------------------------------
Hi All.
Late yesterday Allen [Hudson] did a high speed taxi run in perfect
conditions on 08 to lift off speed.
Unfortunately failing light and time constraints resulted in him
having to delay the actual test flight.
8.30 AM today, again in perfect conditions and on 08 with the best
failed launch options Allen finally gave us an impressive
demonstration. The acceleration rate was excellent and everything he
hoped for with the aircraft lifting off around the taxi way. This
was followed by a clean run close to the ground to a safe speed
where he then went into an impressive climb and I mean impressive.
Unfortunately at 600ft the climb was aborted due to fuel supply
issues and Allen did an uneventful modified circuit.
From full power start of roll to 600ft was 1min 04 sec. Like a said
an impressive rate of climb.
Allen noted a vario reading almost at the top peg prior to aborting.
He is working on mods to resolve the fuel supply rate issue this
week so it won't be long before it flies again.
Congratulations Al.
Cheers.
Nige.
------------------------------------------------------------------------------------------------------------------------------------
Dion Baker
<timmo> you know what i hate
<timmo> errors that wont go away
<Guilty> So you dislike children too
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