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Old Oct 19, 2014, 03:30 PM
flying is not a dream
lebenj's Avatar
Spain, CT, Cardedeu
Joined Jan 2008
990 Posts
Is it possible to get flaps position in mm for dead air?
and wich weight and CG are you using...

regards
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Old Oct 19, 2014, 03:52 PM
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JONBOYLEMON's Avatar
United States, UT, American Fork
Joined May 2002
17,043 Posts
Heavy XXL

239 g
59 CG
4mm

Light XXL
235 g
50 CG
5mm
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Old Oct 19, 2014, 03:53 PM
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JONBOYLEMON's Avatar
United States, UT, American Fork
Joined May 2002
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Shocked to see my CG sooo different on both ships. Maybe I take the nickel out of the nose on the light one?
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Old Oct 19, 2014, 08:13 PM
Oleg Golovidov
olgol's Avatar
Raleigh, NC, USA
Joined Sep 2004
2,376 Posts
50mm is probably too nose heavy. 59mm is probably too tail heavy. With the small chord of XXLite a couple mm difference is a lot.
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Old Oct 19, 2014, 08:42 PM
Aussie F3K Pilot
Melbourne, Australia
Joined Jun 2008
565 Posts
Hi Guy's,
54mm CG and 4mm flap was the sweet spot for me in all conditions. Getting the differential and A-R mix right with lots of flap is very important. I think I ran 2mm down and 8mm up and 10mm a-r mix in the end. You must tune it or it falls out of the sky in the turn.

Also, I run +1mm flap for speed and +2mm for cruise. At 0mm flap I find it is a bit of a dart with a poor l/d at speed. 1mm makes the l/d better.

I have all my settings from the WC in a post somewhere..oh there it is :-) see below.

Marcus
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Last edited by Machineman; Oct 19, 2014 at 08:51 PM.
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Old Oct 19, 2014, 08:47 PM
Aussie F3K Pilot
Melbourne, Australia
Joined Jun 2008
565 Posts
A good place to start, but tune to your liking...post 927
I hope it helps

Quote:
Originally Posted by Machineman View Post
Hi all,
For what it is worth, here are the settings I used at the Worlds...
CG = 55mm
Throws:
E=+/-9mm
R=+/-12mm
Ailerons= +/-10mm and then set the positive differential to give more up than down as follows:
Speed 30%
Normal 50% (10mm up, 5mm down)
Thermal 1 = 60% (about 10mm up, 4 down)
Thermal 2 = 70% (about 10mm up, 3 down)
Thermal 3 = 80% (about 10mm up, 2 down)
Note, these are actual movements as you move the sticks and are taken from the deflected flap positions in each phase. The joys of owning a Graupner MX-20 with 7 flight phases.
Also, I re-trim the elevator in each phase for smooth level flight, but this changes slightly if it is windy or calm (e.g. a calm setting will fly backwards in wind so re-trim in windier conditions to the speed you want, it is quick and easy to do at the start of a day).

Expo 30% on everything

Snap flap +2mm down with full up elevator in all modes except Thermal 3

Aileron to Rudder Mix 100% in all modes

Flap position
Speed = +0.5mm down (yes down, it is better than clean)
Normal = +1mm down (when I go searching for a thermal)
Thermal 1 = +2mm (this is the mode I spend most of my time in)
Thermal 2 = +4mm (only in strong lift)
Thermal 3 = +6mm (only if dead calm with no turbulence)

Launch 1 (rotation phase on a spring switch)
0mm flap and enough up elevator trim to make it rotate fast. Use more when it is clam and less when windy, tune it every time the conditions change or the plane can end up behind your head. Release the spring switch when the plane is between 70 and 90 degrees (vertical).

Launch 2 (zoom phase)
0mm flap when it is calm and -1mm flap when it is windy. Use the elevator trim to make if fly straight up without pushing forward or rolling back over your head. This changes depending on the wind.

Both these launch phases are on a 'flight phase' with independent elevator trim for each phase.

Please, please, please, don't accept these settings as gospel, try, experiment and find your own optimum.

I hope this gives you some different ideas.

I love my XXL's and they are still my primary plane.

Cheers,
Marcus
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Old Oct 19, 2014, 10:08 PM
Registered User
Joined Jan 2014
67 Posts
Let me see if this works! Just goofing off

DLG xxlite launch and land (4 min 49 sec)
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Old Oct 19, 2014, 11:09 PM
Tom Knudtson
Redlands, CA
Joined Aug 2004
600 Posts
Quote:
Originally Posted by JONBOYLEMON View Post
Heavy XXL

239 g
59 CG
4mm

Light XXL
235 g
50 CG
5mm
4 g difference between Heavy and Light? I hope they are different colors so you can tell them apart!
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Old Oct 19, 2014, 11:12 PM
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JONBOYLEMON's Avatar
United States, UT, American Fork
Joined May 2002
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Yes, one is black and one is white. The white one is super light....
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Old Oct 22, 2014, 05:22 PM
Original Bloody Spadder
proppy jon's Avatar
phoenix
Joined Jul 2004
1,211 Posts
Quote:
Originally Posted by TomK View Post
4 g difference between Heavy and Light? I hope they are different colors so you can tell them apart!
tom you should take up the laugh factory on thurday nights john
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Old Oct 22, 2014, 07:56 PM
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JONBOYLEMON's Avatar
United States, UT, American Fork
Joined May 2002
17,043 Posts
PS, even if they were the same color the white one is soo much lighter its obvious its the light one.
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