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Old Jan 20, 2016, 03:16 AM
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Quote:
Originally Posted by Vane4ka View Post
Hello everybody.
I am a new user Diamond 2500.
I want to install the flight controller APM 2.7, who else is flying with a controller?
My MTOW 2700 g, the CG should be such as it is written in the manual?

Thanks for the advice.
Ivan

Ivan,

welcome to the thread!

The position of the CoG is determined by the airframe design/geometry, not the weight of it. Just go with the recommended position +- 5mm.

APM users? I don't think I've heard of any. If I'd mount a APM in mine, I'd place in the wheel bay (after taking out the wheel and plywood supports. This is the most central place in the plane, as you probably can't fit it between the wings...
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Old Jan 20, 2016, 09:22 AM
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Quote:
Originally Posted by Vane4ka View Post
Hello everybody.
I am a new user Diamond 2500.
I want to install the flight controller APM 2.7, who else is flying with a controller?
My MTOW 2700 g, the CG should be such as it is written in the manual?

Thanks for the advice.
Ivan
I have much more than the controller in there. CG does not depend on weight, so keep it close to the right point, but you can compensate with elevator trim, if it's off a bit.
See http://marc.merlins.org/perso/rc/pos...obbyking_.html

Marc
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Old Jan 20, 2016, 02:08 PM
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Thank you, Marc.
I have a few questions.
1. You use Mission Planner?
2. You are using the auto take-off and automatic landing?
3. I would be interested in your settings to MP.
4. What maximum weight you fly?

Thank you. I also use Taranis

Ivan
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Old Jan 24, 2016, 11:47 AM
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Dear pilots.
Tell me why my glider startup goes up? Then he turns over and goes into the ground. I've crashed 4 times in three flights.
As in the video.
RC Diamond 2500 Glider Crash With An 808 Keyring Cam (2 min 28 sec)
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Old Jan 24, 2016, 12:04 PM
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Quote:
Originally Posted by Vane4ka View Post
Dear pilots.
Tell me why my glider startup goes up? Then he turns over and goes into the ground. I've crashed 4 times in three flights....
Ivan,

FCS, we are not mind readers, you need to provide us with some information rather than somebody else's video.

Was it an APM'ed launch?
Was your CoG correct?
Did you check your control surface directions?
Did you launch full power?
Did you do a glide check beforehand?
Is it your first plane?


This is how a relaxed launch flight looks from an onboard camera. Stock motor and prop, 3 cell LiPo, full flaps landing:

Diamond 2500 FPV maiden. Very smooth landing. (1 min 30 sec)
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Old Jan 24, 2016, 12:15 PM
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Quote:
Originally Posted by Vane4ka View Post
Dear pilots.
Tell me why my glider startup goes up? Then he turns over and goes into the ground. I've crashed 4 times in three flights.
As in the video.
https://youtu.be/PwswDdzPJPw
How much pilot and build experience do you have?

If not much: CG wrong, basic trim wrong, throwing too much up, pulling up elevator and stalling. If it happens after a few seconds in the air, maybe because not compensating the motor pull with a little down elevator.

More serious faults: stabilizer loose, incidence (angle) of stab wrong, slipping pushrods of servo or other electric or range fault.

This video shows me launching my Bfg2600 (same aircraft) and not having my hands on the sticks at all. I'm using a Turnigy transmitter glove and taking much time to put my hand into it. I start at 60-70% throttle to avoid motor pitch up and give a gentle right aileron at about 12 seconds.

Winter flying with the Hobbyking BFG2600 (2 min 2 sec)


Let me/us know what you think!
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Old Jan 24, 2016, 12:17 PM
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It's not my first rc-plane, but it's my first glider.
My CG 83.6 mm, MTOW 2700-2800 g.
My pre-flight check:
1. aileron
2. elevator
3.rud
4. flaps
5. engine

Yes, I give full throttle
No, it's manual launch
What glide check?
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Old Jan 24, 2016, 12:25 PM
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Glide test is to throw the plane on a flat surface with motor off and no sticks. It should glide straight and land by itself. You need to throw horisontally or very slightly down.

The weight is impressive! Lots of FPV gear? Mine is exactly 2000g but last summer I helped launching a 2,5 m 3kg (3000g) glass glider. That required both arms even in a stiff headwind. You might need that for yourself too.

No flaps or other things? Do you give full down elevator? What happens then?
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Old Jan 24, 2016, 12:44 PM
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My D2500 esterday )))
I have 2 LiPo 4s 2500 and 3s 2200 together
BEC 15A
APM 2.7.2 with power module, external GPS, telemetry module and many-many wood and EPOXY glue
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Old Jan 24, 2016, 01:47 PM
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It can be a bit scary to do a glide check with a 2.7kg plane. But why not lighten her up before maiden? I believe it's a good idea to maiden a new airframe as light and simple as possible. Much easier, and less damage if anything goes wrong. Once she flies and is trimmed, you can start adding more weight and more system complexity...

and btw, the 83mm is from the LEADING edge, I hope
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Old Jan 24, 2016, 02:00 PM
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Dumb question: Is the plane controlled only by the autopilot?
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Old Jan 24, 2016, 02:41 PM
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KristofferR
Not autopilot only, manual too.

mike_o
Yes, 83mm is from the LEADING edge
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Old Jan 24, 2016, 06:24 PM
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Quote:
Originally Posted by Vane4ka View Post
Thank you, Marc.
I have a few questions.
1. You use Mission Planner?
2. You are using the auto take-off and automatic landing?
3. I would be interested in your settings to MP.
4. What maximum weight you fly?

Thank you. I also use Taranis

Ivan
1) I mostly use apmplanner on linux, sometimes mission planner inside virtualbox
2) I should try auto takeoff, haven't done so yet. Auto landing isn't going to happen in the fields I use and because ardupilot isn't able to pilot my crow landing setup (and landing without crow would take way too much room)
4) between 2.5 and 3kg
3) https://github.com/diydrones/ardupil..._3.4.param.txt

hope this helps
Marc
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Old Jan 31, 2016, 04:49 PM
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Quote:
Originally Posted by Vane4ka View Post
It's not my first rc-plane, but it's my first glider.
My CG 83.6 mm, MTOW 2700-2800 g.
My pre-flight check:
1. aileron
2. elevator
3.rud
4. flaps
5. engine

Yes, I give full throttle
No, it's manual launch
What glide check?
I think full throttle is probably your problem. Half to two thirds throttle is plenty, and you don't want to be pulling back to much on your elevator until you get a bit of height. A nice gentle shallow climb for the first 10 seconds or so on just over half throttle may help, and then gently increase throttle and rate of climb. Been flying mine regularly for three years without problems, apart from a mid air collision which resulted in the loss of a wing tip. Probably the easiest aircraft I have flown, and I think your throttle control may be the main problem.
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