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Jan 30, 2002, 02:39 PM
Master of Desaster ;)
Christian Abeln's Avatar
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Just a quick repaint of our black beauty :)


Hi folks...
after nearly a year of calculating and building, and a try and error maiden flight in which was the model lightly damaged due to a tail heavy configuration, I just repainted the underside of our B-2.

Just throwing in some pics








Quite a marvellous look, isnīt it?
Hopefully the paint is dry tomorrow so that I can paint the top of the plane...
Will post some new pics then
Last edited by Christian Abeln; Jan 30, 2002 at 04:13 PM.
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Jan 30, 2002, 06:01 PM
Lithium Member
Herb's Avatar
Impressive! What is all the white stuff inside, leftover foam? <img src=http://aeneas.ps.uci.edu/edf/confused.gif>
Last edited by Herb; Jan 30, 2002 at 08:12 PM.
Jan 30, 2002, 06:24 PM
Master of Desaster ;)
Christian Abeln's Avatar
Thread OP
Yep Herb...
we cut the whole thing out of white foam blocks and covered it with glass...
On my HP you can see more pics about the building process
Its located under projekte -> B2
Jan 30, 2002, 08:31 PM
Registered User
Look like a monster!! Very nice.
Jan 31, 2002, 09:34 AM
Master of Desaster ;)
Christian Abeln's Avatar
Thread OP
Here we go to the top of the plane






pictures tell more than thousand words
Jan 31, 2002, 10:47 AM
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Doc Watson's Avatar
Christian,

Very nice looking plane, do you have any numbers for us?

AUW
Fan type
Cell count
controllers
thrust and current draw?

will it have retracts?

I'm interested how you arranged your cells and motors, parallel or series?

Doc

www.awatson1.fsnet.co.uk
Jan 31, 2002, 11:01 AM
Master of Desaster ;)
Christian Abeln's Avatar
Thread OP
Doc, here we go :-)

All up weight is approx 9 kilos at the moment... including 3 kilos of steel which substites cell weight... Test flights are done in glider configuration.

Propulsion will be 2 x DS51FAN 3-ph from Daniel Schübeler powered by brushless motors 24 cells each...
For getting enough weight to achieve the correct CG we propably have to double up cell count

ESC will be BEATīs from Kontronik.

wingspan is 3 meters and the prototype model wont have retracts...
If the prototype model flies well enough we plan to make a mould, and lay up 5 or 6 or so...

But before that the flap system and airframe have to be tested and proven to be useful.

Arrangement of the motors and cells will be 24 cells wired to a motor each, giving a total of 48 cells...

I canīt tell you any thrust figures because we havenīt tested the Fans in the ducts right now.. As I said the test flights will take part as a glider due to the cost of the power plant

If u want to see some pics of the building process, just have a look at www.jet-connection.de ...
click on Projekte and then B2...

There you will find some short glimpses on our CAD files and building stage pics

Have fun surfing around... and YES the page wil be in english soon

If there are any questions feel free to ask or mail me
Feb 01, 2002, 05:31 AM
Master of Desaster ;)
Christian Abeln's Avatar
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:-)


Hi folks,

just going on doing repaint








And here a nice fisheye view of the shole ship



Any comments?
Feb 01, 2002, 06:34 AM
SJ
SJ
Registered User
SJ's Avatar
Hey...... Your testbed is almost as pretty as mine

Where have you put the CG ?
Ive tested about 50% to 55% between the leading edge and the aft flap.
But my model is small and inacurate, so I might be way off


SJ
Feb 01, 2002, 06:44 AM
Master of Desaster ;)
Christian Abeln's Avatar
Thread OP
Hi SJ...

I saw your B2 on your site...
The main difference is that our model is as near to scale as it can be (have you seen the sharp leading edge?)
That changes the aerodynamics in the middle section completely...

I built a 2 meter B2 myself, and the CG location was different from our (calculated and tested) model...
We flew this big ship with a CG way too much aft and therefore it cartwheeled a bit...
There fore was the repaint

I have to look after our CG, but I donßt think it will help you much...
On my small ship the CG was almost at the same location as you have it now... And it was flyable...
Our scale B2 not

Plus the ducts will change something too, but not much we think...

Well I think we should keep touch so we can update our projects

Hereīs a pic where U can guess the size of the whole thing


Have fun testing out there...
Maybe you can mail me your airfoil data and we can calculate a bit
Feb 02, 2002, 10:04 AM
SJ
SJ
Registered User
SJ's Avatar
I was also thinking about a 1,5 to 2 meter version.

The one on the pic. took only 20 min. to cut and shape. It was just to get a general idea og what ive got to work with. Its only 65 cm spanwise.

I just have to get some more foam before I begin to build the "real" one.

SJ
Feb 03, 2002, 12:28 PM
Master of Desaster ;)
Christian Abeln's Avatar
Thread OP

Ready for the next tests :)


Its done...
check it out folks





Now we can check the flight abilities again
Feb 03, 2002, 10:40 PM

wow


thats gorgeous! looking great!!

good luck!
Emilio
Apr 27, 2002, 01:13 AM
Master of Desaster ;)
Christian Abeln's Avatar
Thread OP
Last weekend we fixed the split rudder hinging and the pushrods for more flap throw.
What has to be done for the second "maiden" flight is doing a recheck of the CG which wsa way to much afterwards the first time and building in the inlet ducts which will have a vast influence on the aerodynamics of the whole ship even if it flies as a glider.

So what Iīm waiting for is my new receiver which can handle that much functions we need.
The flap management program in the transmitter works fine.

Iīll keep you informed on progress

Have a nice day flying out there...
Apr 27, 2002, 03:43 AM
It wasn't me...
DanSavage's Avatar
Quote:
Originally posted by Christian Abeln ...What has to be done for the second "maiden" flight is doing a recheck of the CG which wsa way to much afterwards the first time...
Hi Chris,

I'm sorry to read about your misfortune on the maiden flight. I'm glad that you were able to repair it and are able to try again.

I used one of your photographs to calculate the MAC, which I'm attaching here. The CG shown in the photo is calculated to be at 23% of the MAC. I've found that 23% of the MAC is a good location for initial test flights for most jets.

I'm wondering where you had calculated the MAC to be located, if it was close to where I calculated and where on the MAC you had balanced the model?

Dan


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