General Electric Discussions Talk about topics related to e-powered RC flying

T28 Durafly TROJAN--Anyone know where the CG is located ?

Old 07-28-2012, 04:19 PM
  #1  
747
Member
Thread Starter
 
747's Avatar
 
Join Date: Sep 2007
Location: Downingtown PA
Posts: 240
Default T28 Durafly TROJAN--Anyone know where the CG is located ?

Hi all.

I am about to fly my T28 Trojan durafly model that I got from HK (usa).

Anyone know where the CG is located ?

Thanks...Kris
747 is offline  
Old 07-28-2012, 05:52 PM
  #2  
dahawk
Super Contributor
 
dahawk's Avatar
 
Join Date: Jul 2011
Location: Keller, TX
Posts: 5,019
Default

Is it not stated in the manual ?
dahawk is offline  
Old 07-29-2012, 07:25 AM
  #3  
CHELLIE
Super Contributor
 
CHELLIE's Avatar
 
Join Date: Oct 2006
Location: Hesperia, So. Calif
Posts: 19,273
Default

On all the reports on the T28 Durafly TROJAN, everyone is saying that the CG is way off, to be on the safe side, set the CG at 25% of the wing cord, 1/4 of the way back from the front leading edge, 25% back is a very very safe place to start from, and move the CG back if you need to a little at a time untill you find the sweet spot, every review i have read, says that the MFG recomended CG is Tail Heavy, hope that helps, Chellie
CHELLIE is offline  
Old 07-30-2012, 01:32 PM
  #4  
WayfaringDreamer
Member
 
WayfaringDreamer's Avatar
 
Join Date: Apr 2012
Location: Harrisburg PA
Posts: 90
Default

I just ordered a Durafly T28.
WayfaringDreamer is offline  
Old 08-03-2012, 09:56 PM
  #5  
squidger
Member
 
squidger's Avatar
 
Join Date: Mar 2010
Location: Horley Surrey UK
Posts: 748
Default

Recently bought a durafly edge 540. Put it together and adjusted to get cg correct as per instructions. First flight was almost uncontrollable. Turns out it flies great with cg half inch forward of instructions position. This aircraft is 32 inch wingspan and runs on a 4s set up so is ballistic. Scary stuff with all that power and a very rearward cg.
squidger is offline  
Old 08-04-2012, 04:52 AM
  #6  
CHELLIE
Super Contributor
 
CHELLIE's Avatar
 
Join Date: Oct 2006
Location: Hesperia, So. Calif
Posts: 19,273
Default

Originally Posted by squidger View Post
Recently bought a durafly edge 540. Put it together and adjusted to get cg correct as per instructions. First flight was almost uncontrollable. Turns out it flies great with cg half inch forward of instructions position. This aircraft is 32 inch wingspan and runs on a 4s set up so is ballistic. Scary stuff with all that power and a very rearward cg.
I learned the hard way ARF planes CG info is almost always Wrong, set the planes CG to be a tad nose heavy on all Maiden Flights and adjust from there, a plane with a Tail heavy CG will fly only once and a Plane with a nose heavy CG will fly, but not great LOL ,Take care and have fun, Chellie
CHELLIE is offline  
Old 08-19-2012, 03:27 AM
  #7  
747
Member
Thread Starter
 
747's Avatar
 
Join Date: Sep 2007
Location: Downingtown PA
Posts: 240
Default

Originally Posted by CHELLIE View Post
On all the reports on the T28 Durafly TROJAN, everyone is saying that the CG is way off, to be on the safe side, set the CG at 25% of the wing cord, 1/4 of the way back from the front leading edge, 25% back is a very very safe place to start from, and move the CG back if you need to a little at a time untill you find the sweet spot, every review i have read, says that the MFG recomended CG is Tail Heavy, hope that helps, Chellie
Thanks Chellie

I will do so as u adviced . I also found this CG pic for the T28 TROJAN.
Need to see if this is 25% from leading edge going back....says it is 2-5/8 inch behing LE.

2 questions :
You always measure from LE that is touching the plane's body right?

After that you mark that with a X and let the wing rest on your finger tip on each side and it should be a lil' nose heavy correct?
If so ...does it matter if I move the finger width wise along the wing few inches from the plane body?

Thx!
747 is offline  
Old 08-19-2012, 03:31 AM
  #8  
747
Member
Thread Starter
 
747's Avatar
 
Join Date: Sep 2007
Location: Downingtown PA
Posts: 240
Default

Forgot to post that pic I found about the TROJAN 's CG.
thx
Attached Thumbnails Click image for larger version

Name:	trojan-13 CG 2and5by8inch.jpg
Views:	981
Size:	8.6 KB
ID:	161978  
747 is offline  
Old 08-19-2012, 03:58 AM
  #9  
WayfaringDreamer
Member
 
WayfaringDreamer's Avatar
 
Join Date: Apr 2012
Location: Harrisburg PA
Posts: 90
Default

The manual says 72 mm = 2.83465 inches = close to 2 and 7/8s.

2 and 5/8ths = 2.625 inches = close to 67 mm

Anyone flying one of these? If yes, what are you using?

edit: after thinking about it 5 mil forward might be a good place to start.

Last edited by WayfaringDreamer; 08-19-2012 at 05:37 AM.
WayfaringDreamer is offline  
Old 08-23-2012, 09:24 PM
  #10  
747
Member
Thread Starter
 
747's Avatar
 
Join Date: Sep 2007
Location: Downingtown PA
Posts: 240
Default Re:

The manual says 72 mm = 2.83465 inches = close to 2 and 7/8s.

2 and 5/8ths = 2.625 inches = close to 67 mm

Anyone flying one of these? If yes, what are you using?

edit: after thinking about it 5 mil forward might be a good place to start.
Guys ,
Give me your input. I hung plane upside down on my CG DIY checker.

Actual CG, with nose bit down is between manual's suggested point and 25% (from front chord edge of wing)....Actual cg (denoted by A in pic) is more close to manual's suggested point though. Plane nose pointed to right in pic.
Is this ok? For maiden?
See pic....thx



-- Kris
747 is offline  
Old 08-24-2012, 10:02 AM
  #11  
squidger
Member
 
squidger's Avatar
 
Join Date: Mar 2010
Location: Horley Surrey UK
Posts: 748
Default

It looks like a good place to start. I usually maiden with a slightly forward CG then once trimmed out I invert the model in flight and the amount of down elevator needed to fly straight and level tells me if the CG is right. I like a rearward CG on my models so they fly inverted with as little as possible down elevator needed. This makes them a bit twitchy but control response is immediate how I like it.
squidger is offline  
Old 08-24-2012, 09:27 PM
  #12  
mclarkson
Super Contributor
 
mclarkson's Avatar
 
Join Date: May 2010
Location: Wichita, KS
Posts: 3,958
Default

25% is almost always a safe place to start.
mclarkson is offline  
Old 08-26-2012, 03:47 AM
  #13  
747
Member
Thread Starter
 
747's Avatar
 
Join Date: Sep 2007
Location: Downingtown PA
Posts: 240
Default Re:

Thanks guys. There is a small rectangular slot where the esc cable comes out to esc. I can add weights in this slot.
But I need to make sure it sticks to thermocol sides.

What can I add as weights, that can stick using super glue?
Anything I can buy from art and craft store or HD?

THX!


-- Kris
747 is offline  
Old 08-26-2012, 01:59 PM
  #14  
squidger
Member
 
squidger's Avatar
 
Join Date: Mar 2010
Location: Horley Surrey UK
Posts: 748
Default

Go to your local car tyre fitters and ask for a strip of stick on weights.
squidger is offline  
Old 10-20-2012, 11:06 PM
  #15  
squidger
Member
 
squidger's Avatar
 
Join Date: Mar 2010
Location: Horley Surrey UK
Posts: 748
Default

I bought a durafly t28 Trojan this week and flew it today. I put the cg where it said in the manual and after a test flight moved it back about 10mm and she flies superbly.So 182mm rear of wing leading edge is good.
squidger is offline  
Old 10-22-2012, 02:50 PM
  #16  
matiac
What, me worry?
 
matiac's Avatar
 
Join Date: May 2012
Location: Westerly R.I.
Posts: 340
Default

I use saltwater fishing sinkers, and rubber cement. And I try to put it as far forward, and as close to dead center as I can. On my P47 (FMS 750MM) the weight is glued directly under the motor, and smack-dab in the middle, and it flies beautiful-like. C.G. is 55MM from leading edge on mine, and a tad nose-heavy with the battery in. LOVE this plane...
matiac is offline  
Old 01-15-2014, 08:16 PM
  #17  
Keenestar
New Member
 
Join Date: Jan 2014
Posts: 1
Default

Hi everybody ,

I have seen pics from people's T28 CG on this plane showing the lipo is VERRY FAR to the rear of the plane to get a good CG.

I needed to cut into the front on the *lipo compartment to remove like 1.5CM foam to get the good CG , How can there be so much difference ?
Keenestar is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
1987tc
Airplanes - Electric For Sale & WTB
2
07-23-2012 04:14 AM
747
General Electric Discussions
16
07-21-2012 10:48 PM
TAUMULLER
Warbird Electrics
15
06-27-2012 11:37 PM
Opuske
Video Parking lot
10
07-29-2011 07:13 PM
DanWard
3D Flying
14
04-15-2011 12:41 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Quick Reply: T28 Durafly TROJAN--Anyone know where the CG is located ?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

Page generated in 0.12704 seconds with 12 queries