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RE: Oakdale Aircraft F-35 construction - 1/9/2004 10:16 AM   
Stig Andersen



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quote:

ORIGINAL: what_the?!

quote:

ORIGINAL: Stig Andersen

3 Kangaroo's




we dont build these.. we shoot them...

Well, sometimes after landing a Kangaroo, and landing a Kangaroo, and landing a Kangaroo, and landing a Kangaroo, and........... I want to shoot it too

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RE: Oakdale Aircraft F-35 construction - 1/9/2004 10:34 AM   
aldousyuen


 

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Status: offline 		Hi Stig,

As I planned to use a 17lbs thrust turbine, I'm laying a layer of carbon fibre around the hatch area (and the hatch itself as it's quite big). I'll install the hatch lock this weekend. It's winter time here and the epoxy is not curing well. I might need to build a cabinet wit heater to actuate the curing cycle.

I don't have a tailepipe designed for 17lbs thrust turbine (those I have are bifurcated for F-15 and F-18). My friend is helping me to get the references to build one.

Chinese New Year holiday is coming, I shouldhave more time finishing up the upgrade work.

Cheers. Aldous.

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RE: Oakdale Aircraft F-35 construction - 1/9/2004 10:49 AM   
aldousyuen


 

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Status: offline 		Hey What_the?!

Kangaroo is one of Australia's symbols. What a shame that I've never in touch with a real Kangaroo (and Koala bear all well) despite I biz travelling to Sydney once or twice a year.

How about we design a Sport Jet and name it "Koala bear"?

Aldous.

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RE: Oakdale Aircraft F-35 construction - 1/9/2004 11:30 AM   
watt_the!



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From: AdelaideSouth Australia, AUSTRALIA
Status: offline 		we have a real problem with Roos...smashing up cars on highways, destroying the ecology...they are an outback pest..in plague proportions in alot of places.

the damage to a car when hit by a roo can be enormous. Some of the big reds get over 200lb and 7 foot tall.
I once drove through a country town whilst visiting family, and on exit i couldnt go any faster than 30 kph, as the road was lined with Roos... literally 100 Roos per 100m for about 20 km. On the road, on the side of the road, jumping across in front of the car etc.

I've never ever seen a Koala in the wild.. only in zoos and some parks.

reminds me aof a story told to me of an indian colleague of mine. He was saying that he was staying on the east coast when he first migrated here and in the second week he saw a platypus in a stream near him.

There are probably 19 million aussies that have never seen that in their lives... right place at the right time eh?

Oh, for the Koala model, it needs to be overweight, slow, difficult to handle, temperamental and difficult to transport.



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RE: Oakdale Aircraft F-35 construction - 1/11/2004 2:28 PM   
Strykaas



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Status: offline 		What the ?

Aren't Roos protected species in Australia ? Are they becoming extinct ?

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RE: Oakdale Aircraft F-35 construction - 1/12/2004 9:52 PM   
Stig Andersen



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Status: offline 		I have startet skinning the bottom of the fuse. I have also glued the plates for the taileron servoes. On the pic. with the taileron servo you also se the 8 mm carbon rod the reenforces the finns.

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RE: Oakdale Aircraft F-35 construction - 1/16/2004 7:37 AM   
Stig Andersen



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Status: offline 		Intake lips have now been finished. (That was a lot of work) The bottom of the fuse is also almost finished, so all I have left now is to do the hatch, and the canopy. The rear duct has been covered with 0,5 mm lithoplate to take some of the heat from the exhaust.

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RE: Oakdale Aircraft F-35 construction - 1/16/2004 6:07 PM   
Interlink


 

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Status: offline 		Roos are about as close to being extinct in Australia as rats are in New York City. (Or penguins in Antartica for that matter) LOL

Very nice work Stig

quote:

ORIGINAL: Strykaas

What the ?

Aren't Roos protected species in Australia ? Are they becoming extinct ?


< Message edited by Interlink -- 1/16/2004 6:09:09 PM >

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RE: Oakdale Aircraft F-35 construction - 1/16/2004 8:04 PM   
watt_the!



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Status: offline 		you got that right about roos.

the thing is they are GREAT eating.
very lean, tasty meat.

you cant farm them though..they just jump the fences!! lol.

i'm no shooter, or fan of guns, but i've heard that some take as many as 6 bullets to drop..so many get away after the initial shot (or two)....

depending on calibre of course- as their heads are so small and they are so fast , a head shot is virtually impossible.

i know this is off topic, but did you know that it is against the war convention to shoot at a person with a 50 cal?...when i hear this it makes me laugh. i can see it now, a M113 with the 50 cal all rigged up comes across some guerillas with heavy artillery.
oh no, cant shoot Sir. Quick load up the 7.62mm!!!... classic stuff eh?



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RE: Oakdale Aircraft F-35 construction - 1/16/2004 8:45 PM   
Strykaas



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quote:

but i've heard that some take as many as 6 bullets to drop


Poor Kangaroos

Do you really eat kangaroos there in Australia ?

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RE: Oakdale Aircraft F-35 construction - 1/16/2004 9:15 PM   
watt_the!



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Status: offline 		yes.. that is no joke.

they really are good food..very good food.

restaurants serve them.

marinated roo is delicious.

this is no joke...seriously... you should try it..it is available in other countries.

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RE: Oakdale Aircraft F-35 construction - 1/16/2004 10:31 PM   
Strykaas



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Status: offline 		Here, roos have an 'affective' dimension (don't know if that's good english...)... I remember Skippy, the hero of a serial...
That's probably why we can't find any roo meat over here ...

You know, it's like chhinese people eating dogs !

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RE: Oakdale Aircraft F-35 construction - 1/16/2004 11:21 PM   
Stig Andersen



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Status: offline 		OK, guys enough about those Roo's.

I have finished the skinning of the fuse and will now move forward to the hatch and canopy area. I have also received the exhaust pipe from SimJet, (a kind sponsorship for this project, thanks Lars ) and I will try an make a belmouth for it. But more on that next week. I have also received the SpringAirs, so pretty soon it will be on wheels as well.

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RE: Oakdale Aircraft F-35 construction - 1/17/2004 2:49 AM   
watt_the!



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ORIGINAL: Strykaas

Here, roos have an 'affective' dimension (don't know if that's good english...)... I remember Skippy, the hero of a serial...
That's probably why we can't find any roo meat over here ...

You know, it's like chhinese people eating dogs !


i dont think it's like that...

aussies eating dogs would be like that....

tim.

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RE: Oakdale Aircraft F-35 construction - 1/24/2004 8:52 PM   
Stig Andersen



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Status: offline 		Things are moving slow at the moment. i am also working on some other projects, so I am not mowing forward as fast as I could right now. But I have made a belmouth for the exhaust pipe. I have used a 2 litre cola bottle to mould the belmouth.

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RE: RE: Oakdale Aircraft F-35 construction - 1/24/2004 9:01 PM   
FalconWings



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Status: offline 		Im sitting in front of a full-scale JSF as I write this. This airplane is really beautiful, but it is still too heavy.

One question, why the circular shape bulkhead, are you planning to install a lifting fan in the future? The F-35 will not VTOL without thrust vectoring ;-)

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RE: RE: RE: Oakdale Aircraft F-35 construction - 1/24/2004 9:22 PM   
Stig Andersen



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Status: offline 		Hello.

I wouldn't know why there is a circular bulkhead om my kit. But I guess the plans for the Oakdale F-35 are made from the original plans. (Or close)

I do not plan on installing a lift fan in my F-35, as I am building the C-version. I like planes to takt off, the conventional way. (CTOL) But I know that Tim, (what the. in this forum) in Australia is working on a project, which is based on the small Oakdale F-35, where he wants to install the lift fan (and actually go hoovering with the thing. )

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RE: Oakdale Aircraft F-35 construction - 3/18/2004 10:57 AM   
Stig Andersen



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Status: offline 		Hi Guys.

I have been receiving some private E-mails about this project. I am truely sorry for not posting any new posts on this thread for some time now, but the thing is, that I have been very busy with other things and other projects. I expect to be back on the F-35 project in 5 or 6 weeks.

Meanwhile I can tell you guys, that I have found a clear canopy that fits pretty well. I have also prepared the exhaust pipe and finished the bellmouth for it. I have also done some filling on the fuselage with at mixture of epoxy resin and micro balloons. This is very easily sanded down when cured.

I wil try and get the U/C mounted, and get some shots of the plane.

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RE: Oakdale Aircraft F-35 construction - 3/18/2004 11:46 AM   
watt_the!



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RE: Oakdale Aircraft F-35 construction - 3/18/2004 11:48 AM   
watt_the!



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RE: Oakdale Aircraft F-35 construction - 3/18/2004 11:56 AM   
Stig Andersen



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Status: offline 		Hi Tim.

Nice of you to post some pics.

Isn't that some .91 fan units?????? They look like Dynamax of Ramtecs to me. Please explain.

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RE: Oakdale Aircraft F-35 construction - 3/18/2004 8:35 PM   
watt_the!



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Status: offline 		ok..

here's the brief.

the goal was to build a vtol controllable with a single radio..pref 7 channels only, that was affordable.

So we started where the engine's were powerful, i.e. 0.21 buggies.

We did alot of development on 21s and although we have found many things, there are mods to be done etc.

So to shorten the exercise we went for a bolt in solution for the p'type. twin 91s and dynamax.

also, rear duct losses were initially a problem, but we've solved that. So there are two types in development. Fully articulating rear duct and this one, for proof of concept, which has swivelling gimbal rear ducted fan.

we plan to downscale this to twin turbax or similar.

We have in the mean time found many nice options for DF alternatives in buggy engines, and made some hybrid fan and shroud units from off the shelf components.

We are about to hover test and have plenty of thrust/weight ratio..even with the relatively heavy aluminium square chassis.

There are some nice tricks affordable thanks to the use of two fans..particularly allowing throttling and positioning effects for balancing about the CoG.

We can also compensate for losses or reduced thrust due to vectoring from this approach.

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RE: Oakdale Aircraft F-35 construction - 3/21/2004 3:32 AM   
parabellum



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Status: offline 		I guess the ultimate goal is to create a craft that can hover and fly.

how hard/easy do you think it is to reproduce that thrust vectoring duct?

and how about the roll control thing that exhaust small amount of jet
under each wing?

and would it be possible to drive a thrust fan with the single engine like f-35?

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RE: Oakdale Aircraft F-35 construction - 3/21/2004 7:18 AM   
watt_the!



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quote:

ORIGINAL: parabellum

I guess the ultimate goal is to create a craft that can hover and fly.

how hard/easy do you think it is to reproduce that thrust vectoring duct?

and how about the roll control thing that exhaust small amount of jet
under each wing?

and would it be possible to drive a thrust fan with the single engine like f-35?



Hi,

Well, as you can imagine, we havent gone into this blindly and looked at all possibilities, including both these points.

Firstly, the vectored duct is easy to produce..we've done it. BUT..theres always a BUT. It is the losses that arent easy. We have a way of splitting the air stream to reduce the single radii of flow so that we can actually half the losses through the bend at 90 degrees. Coupled with the smoothese duct we can find..which we also have..and losses are manageable. But the fact is that it isnt really suitable for a prototype in this configuration. The chassis is setup to accept the gimbal and the thrust vectored duct arrangement.

Both the front and rear fans have vectoring anyway by means of vanes at the base of the fans. There is also a puffer valve which directs air bled offf the front fan to the mid pionts of the wings. We're not even sure if that'll be needed as the CoG is above the fan efflux position, thus any moment created can actually produce roll control from there.

Now, the single engine thing is really quite simple. First it has to be feasible. i.e. the amount of gain by doing this outweighs the complexity/implementation. As the only real engine candidates available are the os 46, os 91 and the magnum 24, we need to still provide the aircraft's weight in thrust, plus about 25%.

So, since a kress rk740 loads up an engine to around 2.2 hp, then two would be at least 4.4 hp and with losses it's probably more like 5 hp. The os 91 may be able to do 4.8 hp with a tuned pipe, but this means that the rear duct has to be too long.

so without tuned pipe we may be getting around 4 hp or less from the OS. We tached the dynamax at 20k without tuned pipe and only 10% nitro.

So we're left with perhaps 1.5 hp to each fan.. which delivers no more than 5-6 lb thrust. Put a duct in there and you got something that simply wont work.

So no need to try it... it wont work.

There are others things in there like gearboxes, clutches, couplings etc that make it pointless.

The bottom line is that any RC VTOL needs an abundance of thrust. At the moment, the best available and useable thrust out there is 10-13 lb.

So unless you can build an aircraft less than 8 lb that is big enough to take a 5.25 inch fan..ignoring all losses of course.. it aint do-able.

I am amazed that Eric Dainty has achieved hovered flight using a single OS 91 through harrier vectoring. It is an extremely light (fragile) build, and is not 1.25 : 1 ratio.

Some days it hovers some days it doesnt. But looking at his work, and development, it is a great achievement. The harrier ductwork is magnificent.

Likewise Doc Watson's Elec tric F35. We ruled out an electric due to the cost of the speed controllers, and number of cells required, for very limited flight duration.

Cheers!

Tim.

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RE: Oakdale Aircraft F-35 construction - 4/25/2004 5:04 PM   
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Status: offline 		Stig,

Any updates on the F-35?

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