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Old Dec 07, 2007, 12:09 PM
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Janusz

the motor is gws 50. batt is full river 300 mha X 2cell.

I think charcer messed up or supply batt volts may have been low.
power seems to be back to normal after recharge that seemed to take forever considering it only flew for a few minutes.

hope fully will have time and decent weather to fly small stuff soon!

David
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Old Dec 09, 2007, 06:09 PM
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Hi all,

I started on on of these yesterday and Supertiga directed me to this thread. Mine is a graupner mini Pitts and it's looking good so far.

Weight with a 3 cell 240 mAh, 10g UH brushless motor, 6Amp speedcontrol, 2 small servo's on a GWS receiver.... 99g.

Add some weight for some glue and paint and it will still be light. This motor with a 4x3" graupner speedcamprop delivers ample of power. She might even go vertical, time will tell. I wonder if an extra servo for rudder control will give better ground control.

Robert
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Old Dec 09, 2007, 06:32 PM
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Hi Robert,
From what I learned by building the bipes: the upper wing is absolutely the last thing you want to attach to the plane... it is always on the way for everthing else....:-)
Play with your componets to make sure that you will get a proper CG before you set it up for good. Looks like you will need to move the motor forward to get CG right.
The rudder servo certainly would help with the ground control but you can add it later after have some experience just flying it from your hand.
Good luck on your project,
Janusz
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Old Dec 09, 2007, 06:50 PM
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get the ESC and li-po as far away from the RX as possible too.
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Old Dec 10, 2007, 11:02 AM
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badwrench
what type of problems have you had with esc/batt to close to rx?

is it intermitent?
continuous?
random?

I ask because even considering that Im low on recent stick time and new to eletric power(past decades of stick time on glow/gas)sometimes it seems that the radio does strange things.

Robert--sounds like yours should go good!
Glue or screw wing struts/mounts--have been reports of upper wings leaving.
is the mini pitts new for graupner ?
if not is it being discontinued?

let us know how it flies!

David
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Old Dec 10, 2007, 11:05 AM
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Robert--just noticed that the aeilerons on your pitts are thicker in section than wing--think I remember someone having flight problems from that.
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Old Dec 10, 2007, 11:26 AM
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my first plane with a GWS rx had a range of about 53ft I had the rx sandwiched between the battry and the rx with the antenna running through the fuse and coming out on the top in front of the rudder and raped over the top of the rudder left to dangle...

I took it apart at the field and one of the locals told me to move the rx as far back as the wires would allow leaving the esc and battery mounted on either side of the motor wires right against the endbell... never had a problem since... I htink I have some pics posted somewhere in this thread.

:edit http://www.rcgroups.com/forums/attac...hmentid=845974

I went though an entire learning process in this thread the guys are great... theres a pic of where my rx is mounted I still do it the same way
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Old Dec 10, 2007, 02:19 PM
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Thanks!

Thanks for the advice all!

I can still move the RX back. Leads are plenty long and it is currently only held in place with double sided tape. There is some space between the esc and the RX and the antenna runs freely over the opposite sie of the fuse from the elevator servo. Currently the CG is at the leading edge of the lower wing. What is the correct CG for this plane? I think it should be about 8 mm in front of the leading edge of the lower wing.

The ailerons are pretty thick but they will be sanded down futher. So far only the top side has been sanded. What exactly was the problem with the thick ailerons? How did it influence the flight characteristics?

As far as the top wing goes.. Beginners error. Can't really get it loose without damaging the wing. I will try to adjust any bad direction by putting in some new struds of carbon.

Still need some mini magnets for holding down the battery-hatch. Any suggestions?

I'll keep you informed!

Robert
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Old Dec 10, 2007, 02:35 PM
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SuperTiga,

It is not new for Graupner but it doesn't seem to be discontinued... On the german website the instructions are still available and I have seen a website which offers it

http://www.graupner.de/fileadmin/dow...ungen/4440.pdf

This german site has 9 on stock:

http://www.cmc-versand.de/index.php?...-4440&ref=1008

I have found more of these on the web.

Robert
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Old Dec 10, 2007, 02:45 PM
It wasn't my fault!!
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Quote:
Originally Posted by Rotatorus
Thanks for the advice all!

I can still move the RX back. Leads are plenty long and it is currently only held in place with double sided tape. There is some space between the esc and the RX and the antenna runs freely over the opposite sie of the fuse from the elevator servo. Currently the CG is at the leading edge of the lower wing. What is the correct CG for this plane? I think it should be about 8 mm in front of the leading edge of the lower wing.

The ailerons are pretty thick but they will be sanded down futher. So far only the top side has been sanded. What exactly was the problem with the thick ailerons? How did it influence the flight characteristics?

As far as the top wing goes.. Beginners error. Can't really get it loose without damaging the wing. I will try to adjust any bad direction by putting in some new struds of carbon.

Still need some mini magnets for holding down the battery-hatch. Any suggestions?

I'll keep you informed!

Robert
I got a set of 12 tiny neo magnets from the Dollar store.. I was looking the other day and they ran out.

If I see them again I'll get a bunch


edit.. oops.. I guess you don"t have a dollar store in The Netherlands
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Old Dec 10, 2007, 03:35 PM
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Hi headspin,

No we don't have that, but if you find some... We can work someting out. Let me know OK? send me a pm or something.

Robert
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Old Dec 27, 2007, 04:03 PM
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Bump!

Just with the holiday greetings to all Acrobipe pilots!
Janusz
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Old Dec 27, 2007, 04:08 PM
Clear for Take-Off!!!
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Hi Janusz,

Happy Holidays to you too and to all Acro Pilots!!!
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Old Dec 28, 2007, 08:17 AM
It wasn't my fault!!
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Cheers Guys!!
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Old Dec 29, 2007, 06:37 PM
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Happy New Year!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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