Ultralight Jets are here

[Blackhawk]

This is for all you inspiring Jet Jockeys.

 

A very good friend of mine, Josef from the Czech Republic who used to live here in Aus but returned to his homeland about 6 years ago.

 

He has been keeping me updated on the progress of the all carbon fibre Ducted Fan Ultralight Jet a group of University people specialising in aviation have been working on for about 10 years and they finally have their Ultralight replica L39 completed and flying.

 

Check out the Pics, a brilliant dream come to life!

 

This is all the info I have at the moment and as soon as he sends me all the specs I will put them here.

 

 

 

 

 

 

 

[kgwilson]

Be nice to have some specs such as empty weight, stall speed, best glide, MTOW max speed, fuel consumption etc

 

 

[SSCBD]

I want it now

 

 

[Russ]

Too late, just spoke to some guy "Putan" ..???? It's getting wrapped as we speak..( mine )

 

 

[pylon500]

Some more info here;

 

http://www.gonzoaviation.com/clanok/projekt-ul-39

 

 

[Blackhawk]

Here some more info:

 

 

 

[dunlopdangler]

just a shame with all that work that they couldn't get more than 120kts cruise.. but I guess its all relative to getting the weight/stall speed down to within the rules.. now if they could come up with something between this and the full blown l39..

 

 

[fly_tornado]

what jet engine only does 15L a hour the subsonex PBS TJ-100 does 15G/h

 

 

[Kiwi303]

I guess they can go mid engine like that, sit the engine where the pilot goes on a tractor mount and put the pilot up front like a real jet.

 

Wasn't some guy called Malish or the like doing another Ducted fan somewhere in Russia?

 

 

[Nobody]

what jet engine only does 15L a hour the subsonex PBS TJ-100 does 15G/h

I think it is a ducted fan not a true jet. Hence the good fuel flow but also the modest performance. ie cruise is only about 120 knots.

 

 

[fly_tornado]

you're right, ducted fan using a 1000cc bike engine? still can't see that doing only 15L hour

 

 

[kasper]

And the shame is that its never going to be an Australian Ultralight under the current CAO ... no propeller = no 19- registration in the experiential category - needs to go VH reg experimental

 

 

[pylon500]

And the shame is that its never going to be an Australian Ultralight under the current CAO ... no propeller = no 19- registration in the experiential category - needs to go VH reg experimental

I think you can class a ducted fan as a propellor....?

Hope so, cause I've got a few ideas...

 

Some Specs...

"Wing area; 8.5m² (23.6 sq ft)" ?, more like 91.4 sq ft

 

you're right, ducted fan using a 1000cc bike engine? still can't see that doing only 15L hour

I tend to agree, probably more like 20 Lph.

 

just a shame with all that work that they couldn't get more than 120kts cruise.. but I guess its all relative to getting the weight/stall speed down to within the rules.. now if they could come up with something between this and the full blown l39..

With a 1000cc bike engine, it's probably only just putting enough thrust to get airborne with two people in it, but if you've got the money, you could put the Subsonex motor in it (and VH rego).

 

 

[Guest Howard Hughes]

If it really was a jet, with a 280 kg empty weight, a 450 kg MTOW and my 90 kg ass in there, it wouldn't be going very far...

 

 

[Kiwi303]

If it really was a jet, with a 280 kg empty weight, a 450 kg MTOW and my 90 kg ass in there, it wouldn't be going very far...

A JATO pack help? Or would that just Darwinise the nearest cliff face?

 

 

[pylon500]

There is another one out there, that has also flown, here's one of the test flights;

 

And if you browser can translate Russian, here's some of the build forum (Russian EAA);

 

http://www.reaa.ru/cgi-bin/yabb/YaBB.pl?num=1287751367/0

 

Corvette V8 driving two fans..... not quite RAAus

 

 

[kasper]

A ducted fan really does beg the question - when is a spinning thrust producing set of blades not a propeller?

 

And if a ducted fan is a propeller what differentiates that from a bypass jet engine?

 

But the Russian one will definitely fall foul of the 1 propeller rule

 

 

[Guest Howard Hughes]

There is another one out there, that has also flown, here's one of the test flights;

Now that's nice apart from the landing gear!

 

 

[Downunder]

There is another one out there, that has also flown, here's one of the test flights;

Now imagine pulling up at a fly-in in one of these......with "numbers" on the side.

 

GA eyeballs popping everywhere!!

 

 

[bexrbetter]

just a shame with all that work that they couldn't get more than 120kts cruise..

120kts and 450kgs sounds like the Euro Ultralight regs doesn't it?

 

Corvette V8 driving two fans..... not quite RAAus

I've watched the Malish build for a few years, some iffy stuff going on but to his credit, he has shipped it to Sun'n'Fun show which is on this week - don't know if it will fly there or not, I would be more convinced if he did.

 

 

[dunlopdangler]

Bex.. I know the Euro rules.. don't take half of my statement out of context/// my point was simply all that design work for that outcome.. Why bother!!

 

 

[bexrbetter]

Bex.. don't take half of my statement out of context

Did you notice the question mark at the end of my sentence? < it looked just like that.

 

I would only dare take half of your statement out of context if you declared yourself to be witty.

 

 

[pylon500]

Bex.. I know the Euro rules.. don't take half of my statement out of context/// my point was simply all that design work for that outcome.. Why bother!!

As you say, from a technical standpoint, 400 odd horse power to do around 150 knots, yeah, not efficient.

But as someone else pointed out, we're only flying ultralights for fun, just imagine the looks when you roll up in something like this !!!

 

And for my next project;

 

 

 

[Kiwi303]

[ATTACH=full]42318[/ATTACH]

With the wings well out the back on that, almost Long EZ ish, wouldn't you need a clear plastic canard set up front to provide front lift?

 

Centre of Lift recedes rearwards at high post-Mach velocities, something to do with pressures and sonic booms, so high speed planes tend to be wing-rearwards, not very effective at low speeds like RA and GA planes...

 

Even with a lifting body design, I wonder how the nose stays up on that plane.

 

 

[Downunder]

I think Arthur is just playing "photoshop designer" on that one.......