Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > Work Bench > Rocket Boosted Gliders
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 12-18-2018, 09:30 PM
aeppel_cpm aeppel_cpm is offline
Ciderwright
 
Join Date: Apr 2013
Location: Burlington, WI
Posts: 633
Default Looking for tips: unwarping a glider body

I’m working on a 2.28x Tercel, and I’ve noticed the body has picked up a bend.



It’s a 3mm bend.

The construction is basswood over foamcore. I’m planning on capping the laminate with balsa. I’ve only done the nose so far.

Any suggestions for straightening this thing out?
__________________
Charles McGonegal
Ciderwright
AEppelTreow Winery & Distillery
Ad Astra Tabernamque!
Reply With Quote
  #2  
Old 12-18-2018, 11:06 PM
Jerry Irvine's Avatar
Jerry Irvine Jerry Irvine is offline
Freeform rocketry advocate.
 
Join Date: Jan 2008
Location: Claremont, CA "The intellectual capitol of the world."-WSJ
Posts: 3,780
Default

Moisture and a press/books. If it turns in flight that is a good thing and requires less wing clay.

Just Jerry
Reply With Quote
  #3  
Old 12-18-2018, 11:46 PM
LeeR's Avatar
LeeR LeeR is offline
Retired with Way Too Many Kits
 
Join Date: Jun 2007
Location: Colorado
Posts: 3,222
Default

Another option is a heat gun. It works well, with moisture, to get parts straight. If clamping is difficult, you may even be able to hold it for a few minutes in the correct position long enough for cooling to cause it to set in its new position.

If you don’t have a heat gun, you can get them for as little as $10 at Harbor Freight, using a 20% off coupon.
__________________
Lee Reep
NAR 55948

Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor
In the Paint Shop: Nothing! Too cold!
Launch-Ready: Farside-X, Maxi Honest John, Super Scamp
Reply With Quote
  #4  
Old 12-19-2018, 12:15 AM
Ez2cDave's Avatar
Ez2cDave Ez2cDave is offline
Banned
 
Join Date: Mar 2005
Location: Raleigh, NC Area
Posts: 1,743
Default

Quote:
Originally Posted by Jerry Irvine
Moisture and a press/books. If it turns in flight that is a good thing and requires less wing clay.

Just Jerry



I'm concerned that it might "spiral" or "corkscrew", during boost.

Dave F.
Reply With Quote
  #5  
Old 12-19-2018, 05:21 AM
astronwolf's Avatar
astronwolf astronwolf is offline
Lost his Drifter
 
Join Date: Mar 2013
Location: Northeast Ohio
Posts: 1,277
Default

Quote:
Originally Posted by Jerry Irvine
Moisture and a press/books. If it turns in flight that is a good thing and requires less wing clay.

This. I'll add patience to that.

Maybe if you used something to anchor the glider to your work table in the position shown in the photo, like a book or somekind of weight. Use a rubber band to deflect the boom aft of the wing's trailing edge so that it's straight. You'll have to rig something up to do this. Moisten the boom in the area just aft of the trailing edge of the wing. Don't get the wing wet. Allow to dry overnight, and check for straightness the next day. Repeat if necessary.
__________________
-Wolfram v. Kiparski
NAR 28643 - TRA 15520
MTMA Section #606 President
Reply With Quote
  #6  
Old 12-19-2018, 08:40 AM
aeppel_cpm aeppel_cpm is offline
Ciderwright
 
Join Date: Apr 2013
Location: Burlington, WI
Posts: 633
Default

Quote:
Originally Posted by Ez2cDave
I'm concerned that it might "spiral" or "corkscrew", during boost.

Dave F.


I'm also more concerned about boost than glide.

Thanks for the suggestions, gents. I'm hoping the capping - turning the laminate into a box - will help stabilize it - but I'd like to get it straight first. I'll try heat before moisture, as I suspect moisture got me into this pickle in the first place. Laminated with TBII.

How I did the body, clamped to a launch rail.


And the capping around the nose. 1/32” balsa, ammonia shaped.
__________________
Charles McGonegal
Ciderwright
AEppelTreow Winery & Distillery
Ad Astra Tabernamque!
Reply With Quote
  #7  
Old 12-19-2018, 10:02 AM
ghrocketman's Avatar
ghrocketman ghrocketman is offline
President, MAYHEM AGITATORS, Inc.
 
Join Date: Jul 2005
Location: Nunya Bizznuss, Michigan
Posts: 13,443
Default

If you moisten wood with ammonia water (Ajax, BoPeep, etc) the wood flexes much easier than with plain water.
__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL
, if you have to ask what is "NORMAL" , you probably aren't !

Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !
Reply With Quote
  #8  
Old 12-19-2018, 09:37 PM
Ez2cDave's Avatar
Ez2cDave Ez2cDave is offline
Banned
 
Join Date: Mar 2005
Location: Raleigh, NC Area
Posts: 1,743
Default

Quote:
Originally Posted by ghrocketman
If you moisten wood with ammonia water (Ajax, BoPeep, etc) the wood flexes much easier than with plain water.




The use of Ammonia & Water would work on an all wood fuselage, but he used a foam "core" for the fuselage, with Basswood sides bonded to the foam.

On an all-wood fuselage, Steam could also be used, but I am concerned about how the foam might react to the heat.

I'm wondering if the warping was either caused by a reaction between the foam and the adhesive used or if the fuselage was un-clamped too soon, before it had fully dried / cured .

Dave F.
Reply With Quote
  #9  
Old 12-19-2018, 10:23 PM
ghrocketman's Avatar
ghrocketman ghrocketman is offline
President, MAYHEM AGITATORS, Inc.
 
Join Date: Jul 2005
Location: Nunya Bizznuss, Michigan
Posts: 13,443
Default

I don't think ammonia would attack any foam.
__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL
, if you have to ask what is "NORMAL" , you probably aren't !

Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !
Reply With Quote
  #10  
Old 12-19-2018, 11:43 PM
Ez2cDave's Avatar
Ez2cDave Ez2cDave is offline
Banned
 
Join Date: Mar 2005
Location: Raleigh, NC Area
Posts: 1,743
Default

Quote:
Originally Posted by ghrocketman
I don't think ammonia would attack any foam.


I wasn't thinking about the Ammonia attacking the foam. I was thinking that since the wood was bonded to the foam, the Ammonia would only penetrate the wood and, as a result, not allow the wood to remain straightened if the foam is causing the warping.

Dave F.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -5. The time now is 06:26 AM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe © 1998-2024