SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Mar 28, 2010, 10:29 AM
Registered User
bosco49's Avatar
USA, CA, Shasta Lake
Joined Mar 2005
359 Posts
Discussion
Tail heavy High Aspect-ES 3.1M electro

Just finish up building this AH High Aspect-ES 3.1M electro....But its tail heavy ....Has anyone that has ever build one came across this?
bosco49 is offline Find More Posts by bosco49
Reply With Quote
Sign up now
to remove ads between posts
Old Mar 28, 2010, 01:04 PM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
What motor and battery are you using?
..a
Andy W is offline Find More Posts by Andy W
Reply With Quote
Old Mar 28, 2010, 03:17 PM
Registered User
bosco49's Avatar
USA, CA, Shasta Lake
Joined Mar 2005
359 Posts
Andy its a PJS 2500,And the pack is a Rhino 2250mAh 3S1P 30C Lipoly Pack...Weight : 199g.I might go with a heaver motor Mega ACn 22/30/3 and a bigger pack??
bosco49 is offline Find More Posts by bosco49
Last edited by bosco49; Mar 28, 2010 at 03:25 PM.
Reply With Quote
Old Mar 28, 2010, 04:24 PM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
Well, first, how much weight do you have to add up front to balance it? If it's just a couple of oz, then the heavier pack or motor might be the answer.

Where are your servos mounted? Do you have a receiver pack?
..a
Andy W is offline Find More Posts by Andy W
Reply With Quote
Old Mar 28, 2010, 07:42 PM
Registered User
sruelle's Avatar
United States, MI, Ann Arbor
Joined Feb 2005
413 Posts
I have the glider version tranformed in a e-glider. As nose is longer banlancing is just right for me with my BL480 6G 4.4/1

so if you have a light motor, it doesn't surprise me that you have some issues balancing it.

I use a 4AA reciever pack, close to CG and the lipo pack in the front

servos and reciever under the wings

I will never flew again without a reciever pack! Newton has won on me with a glider equiped with a BEC!

Just like this glider, probably one of my favorite TD plane
sruelle is online now Find More Posts by sruelle
Reply With Quote
Old Mar 28, 2010, 08:17 PM
Registered User
Terre Haute, Indiana, USA
Joined Aug 2004
959 Posts
My High Aspect balances well with an AXI 2820/10 motor and a Hyperion 3S 2600 pack about 8 mm back from the motor. I use a CC Ph 80 ESC (more than enough for that motor!), which is positioned on the lipo pack. No extra weight needed beyond those components. The tail servos are under the wing, with the receiver just in front of the servos. AUW about 56 oz.
Forest Flyer is offline Find More Posts by Forest Flyer
Reply With Quote
Old Mar 28, 2010, 09:55 PM
Registered User
bosco49's Avatar
USA, CA, Shasta Lake
Joined Mar 2005
359 Posts
Thanks for the input guys....my servos are mounted at the CG point and I dont use a receiver pack,The receiver is about 20MM behind the CG...you can look at the pics in my blog.I think the heavier motor might be the answer....the Mega ACn 22/30/3 is 220g,I will be pulling out the PJS its 162g...58g to play with.I also have a Multiplex BL-480/4G but its only 117g.
bosco49 is offline Find More Posts by bosco49
Last edited by bosco49; Mar 28, 2010 at 10:01 PM.
Reply With Quote
Old Mar 29, 2010, 07:53 PM
Registered User
sruelle's Avatar
United States, MI, Ann Arbor
Joined Feb 2005
413 Posts
Forest, I just have the same AUW than you

Bosco have fun with it; mine is in the back of the car allready for tomorrow!
Look like a good day is coming in Michigan!
sruelle is online now Find More Posts by sruelle
Reply With Quote
Old Mar 29, 2010, 11:14 PM
Registered User
bosco49's Avatar
USA, CA, Shasta Lake
Joined Mar 2005
359 Posts
sruelle...........''Tomorrow''......That a work day...........you cant going flying on a work day......well have fun for me too.
bosco49 is offline Find More Posts by bosco49
Reply With Quote
Old Mar 30, 2010, 08:35 PM
Registered User
sruelle's Avatar
United States, MI, Ann Arbor
Joined Feb 2005
413 Posts
I take what I call an extended lunch break!

that will be too bad to let all these thermals going away without a glider in it!

Today was great!

The HA was the right sailplane, arround noon, as lift was just trying to establish. this glider is circling so well!
sruelle is online now Find More Posts by sruelle
Reply With Quote
Old Mar 30, 2010, 10:45 PM
Registered User
bosco49's Avatar
USA, CA, Shasta Lake
Joined Mar 2005
359 Posts
I went the Mega ACn 22/30/3 and the receiver pack is in the front of the CG...everthing is in the front,A Turnigy 2650mAh 3S 30C Lipo Pack.The Pack Weight is 247g....with all that done I can get a balance at 5mm behind the CG......What do you guys think?
I can put big holes in the Horizontal stab.......
bosco49 is offline Find More Posts by bosco49
Reply With Quote
Old Mar 31, 2010, 07:39 AM
tamed gliding frog
abla57's Avatar
France, PACA, Carpentras
Joined Dec 2006
212 Posts
from common experience on a French forum, the CG indicated on different versions of AH instructions varies from 77 to 100 mm !!!
The high aspect flies very well with CG between 81-86 mm from LE (Mine is 84mm ).

What measured CG are you ?
abla57 is offline Find More Posts by abla57
Reply With Quote
Old Mar 31, 2010, 08:03 AM
Registered User
Terre Haute, Indiana, USA
Joined Aug 2004
959 Posts
Quote:
Originally Posted by abla57 View Post
from common experience on a French forum, the CG indicated on different versions of AH instructions varies from 77 to 100 mm !!!
The high aspect flies very well with CG between 81-86 mm from LE (Mine is 84mm ).

What measured CG are you ?
Good point. I fly mine at about 84 - 85 mm back from the LE.
Forest Flyer is offline Find More Posts by Forest Flyer
Reply With Quote
Old Mar 31, 2010, 08:21 AM
Registered User
Terre Haute, Indiana, USA
Joined Aug 2004
959 Posts
Quote:
Originally Posted by bosco49 View Post
I went the Mega ACn 22/30/3 and the receiver pack is in the front of the CG...everthing is in the front,A Turnigy 2650mAh 3S 30C Lipo Pack.The Pack Weight is 247g....with all that done I can get a balance at 5mm behind the CG......What do you guys think?
I can put big holes in the Horizontal stab.......
Well, that much weight, put as far up front as possible, would definitely make my HA nose heavy.

I looked at your blog photos, and nothing looks unusual or obviously heavy to the rear of the CG. How did you secure the control rods in the tail boom?

FF
Forest Flyer is offline Find More Posts by Forest Flyer
Reply With Quote
Old Mar 31, 2010, 09:01 AM
Registered User
bosco49's Avatar
USA, CA, Shasta Lake
Joined Mar 2005
359 Posts
The control rods in the tail boom are in the Sullivan Semiflex Gold-N-Rod....BUT I Just the used the Blue sheath part to run the two small stock push rods in.I cut a 20'' of the Blue sheath part and glued with thick CA.I did this also with my AH Serenity-EV 2.5M electro-glider and really no change with the CG on that plane.........I went with the stock 82 CG.....Sooooo a CG around 87 would work?.
bosco49 is offline Find More Posts by bosco49
Last edited by bosco49; Mar 31, 2010 at 09:09 AM.
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Art Hobby High Aspect-E 3.1M electro-glider bosco49 Electric Sailplanes 3 May 16, 2006 05:34 AM
Discussion ArtHobby High Aspect RES-3.1m csocso Thermal 2 Jan 25, 2006 01:04 PM