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Old Mar 04, 2012, 09:59 AM
Fly like you can still see it
Dave Garwood's Avatar
USA, NY, Schenectady
Joined Mar 2009
127 Posts
Multiplex DG600

Jay,

> My MPX DG600 is @ 3.6m span so should be close to your 800.

A flying buddy let me fly his MPX DG600 at Soar Utah 2010.
I flew it for an hour and loved it. It was that experience that
set me on the search path for a scale plane of my own.

> I've attached the setup from MPX to get you started.

Thank you. Thank you.

> When I setup my DG-600 accordingly it was just Fab.

Way cool news for me.

> P.S. My H-stab measures just over 25-1/2" & 4-5/8" chord (w/elev.)

Mine's a smidge smaller in both directions.

// Dave

.

Photos of Arthur M and MPX DG600 that he let me fly at Soar Utah 2010.
POTM is a great place to fly due to the lift and the large flat landing area.
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Old Mar 04, 2012, 11:34 AM
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Lbuff1's Avatar
Killingworth CT
Joined Nov 2008
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Is Soar Utah this year? If so, when?
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Old Mar 04, 2012, 12:38 PM
Fly like you can still see it
Dave Garwood's Avatar
USA, NY, Schenectady
Joined Mar 2009
127 Posts
Soar Utah 2012

Quote:
Originally Posted by Lbuff1 View Post
Is Soar Utah this year? If so, when?
Yes. August 30 - September 3, 2012

http://soarutah.org
http://www.rcgroups.com/forums/showthread.php?t=1580057
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Old Mar 11, 2012, 08:22 PM
Fly like you can still see it
Dave Garwood's Avatar
USA, NY, Schenectady
Joined Mar 2009
127 Posts
A question of balance

Quote:
Originally Posted by AirBornOne View Post
I've attached the setup from MPX to get you started.
When I setup my DG-600 accordingly it was just Fab.
Skies.
Jay
Got the in-fuselage servos mounted and some nose weight epoxied in place.
Hanging it from the basement ceiling, I can get it to balance right on the wing rod
by moving the battery pack. Happy day.

Jay said his Multiplex DG-600 balances 78mm behind the LE.
Mine balances 67mm behind the LE (center of the wing rod).

Any of the Gerasis DG-800 flyers have their balance point marked?
Test fly it at 67mm, or move it back a little?

Thanks.
// Dave
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Old Mar 12, 2012, 12:10 AM
Life-abstract=conformity
S.F. Bay Area
Joined Aug 2002
1,872 Posts
Looks good Dave.
I don't think 9mm is much to worry about. A forward CG to start with is usually a safe bet & a 9mm difference on this size A/C is nothing tragic.
I'm not a fan of your CG method though. A loop of string X2 + some potential interference from the fuse/wing can IMO create to much friction for a true reading.On a 20 some odd pound model it may not be an issue but these are much lighter.
So far I've been mounting a small screw eye @ the documented CG location on the fuse bottom.Hang the model upside down and I get a good feel for spanwise balance & CG.These are primarily slopers w/o retracts.
Skies
Jay.
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Old Mar 12, 2012, 06:31 AM
Fly like you can still see it
Dave Garwood's Avatar
USA, NY, Schenectady
Joined Mar 2009
127 Posts
I plan to fly it this weekend at Cumberland

Jay,

> I don't think 9mm is much to worry about.

Right. Less than half an inch. 13mm is half an inch.

> A forward CG to start with is usually a safe bet

Yes, proven over and over in practice.

> I'm not a fan of your CG method though. A loop of string X2 + some potential interference from the fuse/wing can IMO create to much friction for a true reading.

Ya know, it DID seem to rest pretty steady in the two slings.
I'm sure you're right about this. Plane's too big for my regular balance rig.

>These are primarily slopers w/o retracts.

Yippee. I'm stoked.

I'm planning first flight this for this weekend at Cumberland Spring Soar for Fun.
http://www.rcgroups.com/forums/showt...ght=cumberland

// Dave
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Old Mar 12, 2012, 07:36 AM
Life-abstract=conformity
S.F. Bay Area
Joined Aug 2002
1,872 Posts
Quote:
Originally Posted by Dave Garwood View Post
Yippee. I'm stoked.

I'm planning first flight this for this weekend at Cumberland Spring Soar for Fun.
http://www.rcgroups.com/forums/showt...ght=cumberland

// Dave
DOOD!
Have fun and take picts.
Or videos!
Skies
J
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Old Mar 14, 2012, 03:55 PM
Fly like you can still see it
Dave Garwood's Avatar
USA, NY, Schenectady
Joined Mar 2009
127 Posts
Gerasis DG-800 is ready to go

My Gerasis 3.6 meter DG-800 is completed and ready to fly.
Graphics from Callie at www.callie-graphics.com

Bench time to get it to this point, 26 hours.
All up weight = 92 ounces.
If someone has the wing area handy, I can calculate wing loading.

Cumberland Spring Soar for Fun, here I come.
http://www.rcgroups.com/forums/showt...ght=cumberland

.
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Old Mar 14, 2012, 04:31 PM
Life-abstract=conformity
S.F. Bay Area
Joined Aug 2002
1,872 Posts
Looks great Dave.
The canopy sure looks dark in the pict.Hope it doesn't cook.
Skies
Jay
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Old Mar 14, 2012, 04:33 PM
bie
maidenflight-postponer
bie's Avatar
Germany
Joined Oct 2004
788 Posts
Dave,

right now I'm on a skiing holiday trip and away from home. Though I may be not able to find the documentation, when returning home next weekend I may be able to look for details regarding the CG in a report I wrote years ago for special interest magazine AUFWIND or MODELLFLUG INTERNATIONAL (forgot which it was).

But I can't tell before monday...

If you maiden next weekend: Good luck!

Andy
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Old Mar 14, 2012, 05:49 PM
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slopemeno's Avatar
Joined Jan 2003
6,928 Posts
I don't recall the wing area but I was shocked when I ran the numbers and the wingloading on My Higgins Alias was lower...
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Old Mar 14, 2012, 06:48 PM
Fly like you can still see it
Dave Garwood's Avatar
USA, NY, Schenectady
Joined Mar 2009
127 Posts
Aspect ratio

Quote:
Originally Posted by slopemeno View Post
I don't recall the wing area but I was shocked when I ran the numbers and the wingloading on My Higgins Alias was lower...
They say there's no substitute for aspect ratio.

.
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Old Mar 14, 2012, 08:44 PM
Vintage wood is the best!
SZD16's Avatar
In a house
Joined Sep 2002
2,826 Posts
Quote:
Originally Posted by Dave Garwood View Post
I'm planning first flight this for this weekend at Cumberland Spring Soar for Fun.
Dave......just wanted to be sure that you know that Cumberland is NOT this weekend but next weekend....the 22-26 of March....Thursday thru Monday.

Tom
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Old Mar 15, 2012, 07:30 AM
Fly like you can still see it
Dave Garwood's Avatar
USA, NY, Schenectady
Joined Mar 2009
127 Posts
22-26 of March

Quote:
Originally Posted by SZD16 View Post
Dave......just wanted to be sure that you know that Cumberland is NOT this weekend but next weekend....the 22-26 of March....Thursday thru Monday.

Tom
Tom,
Right. Thank you.
I wrote it wrong on my wall calendar, but caught it in time when making hotel reservation.
See you guys for the soiree on FRI nite MAR 23, maybe Friday at the field.

// Dave
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Old Mar 15, 2012, 09:40 AM
Vintage wood is the best!
SZD16's Avatar
In a house
Joined Sep 2002
2,826 Posts
Great! I would hate for you to come all that way.....get to the top of the mountian......and have nobody be there! 8-)
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