ANY self launch jets going yet?
--- On Tue, 14/4/09, Mike Borgelt <[email protected]> wrote:
From: Mike Borgelt <[email protected]>
Subject: Re: [Aus-soaring] ASW20 Tri Jet
To: "Discussion of issues relating to Soaring in Australia."
<[email protected]>
Received: Tuesday, 14 April, 2009, 11:15 AM
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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