Canard Community Forum  

Go Back   Canard Community Forum > Landing Gear, Wheels, Tires, and Brakes
FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Display Modes
  #16  
Old 05-26-2007, 12:59 PM
Marc Zeitlin Marc Zeitlin is offline
Member
 
Join Date: May 2004
Location: Tehachapi, CA 93561
Posts: 1,083
Default

Quote:
Originally Posted by TMann View Post
The Infinity 1 has 3 plys of Kevlar on the bottom of the fuse (as does the Berkut) for damage protection in the event of a gear up landing.
The Infinity has never flown, much less tested any Kevlar capabilities.

This is the first I've heard of Kevlar in a Berkut.

http://www.berkutengineering.com/index.html

makes no mention of Kevlar, but it's pretty sparse.

Richard?
__________________
Reply With Quote
  #17  
Old 05-26-2007, 01:18 PM
TMann's Avatar
TMann TMann is offline
Got Foam?
 
Join Date: Mar 2007
Location: Omaha, NE
Posts: 756
Default

Marc.......are you doubting Thomas?

Jump to this Berkut Page and do a search on "Kevlar" . I knew I had seen this somewhere (but thanks for keeping me honest.)

Quote:
The Berkut also makes use of carbon fiber and Kevlar in the design. Carbon fiber is found in the canopy frame, wing skin, and in the mainwing sparcaps and the canard sparcaps. Carbon fiber is stiffer and stronger than fiberglass, and in its Berkut application it prevents unwanted flexing, particularly in the wing, making for a much more rigid wing with no weight penalties. Kevlar is used in the belly, under the glass outer skin, to protect the underlying skin in the event of a gear-up landing.
__________________
T Mann - Loooong-EZ/20B Infinity R/G Chpt 10 N200LZ
Got Foam?
Mann's Airplane Factory
We add rocket's to everything!
Reply With Quote
  #18  
Old 05-26-2007, 05:31 PM
Clutch Cargo's Avatar
Clutch Cargo Clutch Cargo is offline
w/ Spinner and Paddlefoot
 
Join Date: May 2004
Location: Cape Coral, FL
Posts: 602
Question

Quote:
Originally Posted by TMann View Post
The Berkut also makes use of carbon fiber and Kevlar in the design. Carbon fiber is found in the canopy frame, wing skin, and in the mainwing sparcaps and the canard sparcaps. Carbon fiber is stiffer and stronger than fiberglass, and in its Berkut application it prevents unwanted flexing, particularly in the wing, making for a much more rigid wing with no weight penalties. Kevlar is used in the belly, under the glass outer skin, to protect the underlying skin in the event of a gear-up landing.
So, how well does it work?
__________________
Plans #618, a tub, and everything I need to go to chapter 11 except: TIME! and a cold beer

"I'll do the "thinnin'" around here, Bobba Looey" ! - Quicksdraw McGraw
Reply With Quote
  #19  
Old 05-26-2007, 10:22 PM
Nathan Gifford Nathan Gifford is offline
Nathan Gifford
 
Join Date: Oct 2004
Location: Tickfaw, LA
Posts: 897
Default

A few people have tested the skid plates and they work fine. I am not sure whether kevlar is warranted.
__________________
Nathan Gifford
Tickfaw, LA USA
Cozy Mk IV Plans Set 1330
Better Still --> Chapter 9
Reply With Quote
  #20  
Old 05-27-2007, 03:00 PM
TMann's Avatar
TMann TMann is offline
Got Foam?
 
Join Date: Mar 2007
Location: Omaha, NE
Posts: 756
Default

Quote:
Originally Posted by Nathan Gifford View Post
A few people have tested the skid plates and they work fine. I am not sure whether kevlar is warranted.
The Kevlar is being used as additional protection in the event of a gear-up landing. It is also used in the area where the winglet have potential for making contact with the ground.

My plane will have fully retractable gear so it also will have the kevlar over the glass plies on the belly of the aircraft.

Quote:
Originally Posted by Clutch Cargo View Post
So, how well does it work?
I don't know of anyone who has had a gear-up landing with the Kevlar skins. Two manufacturers include it in their build and that's a strong enough argument for me.
__________________
T Mann - Loooong-EZ/20B Infinity R/G Chpt 10 N200LZ
Got Foam?
Mann's Airplane Factory
We add rocket's to everything!
Reply With Quote
  #21  
Old 05-27-2007, 09:45 PM
chasingmars chasingmars is offline
ChasingMars
 
Join Date: Apr 2006
Location: Ottawa, Ontario, Canada
Posts: 418
Default

Quote:
Originally Posted by TMann View Post
I don't know of anyone who has had a gear-up landing with the Kevlar skins. Two manufacturers include it in their build and that's a strong enough argument for me.
Just don't forget the counter-arguments... more weight, need to make sure you don't have a stiffness-strain issue in your laminate (haven't looked at kevlar recently enough to know how much it's modulus differs from E-glass), not really sandable, and where you need it for abrasion resistance it's typically in compression load when asked to perform for real (i.e. if you dump it on it's nose), and Kevlar's not so great in compression.
__________________
Craig K.
Cozy IV Plans #1457 - Building Chapter Six!
http://www.maddyhome.com/canardpages/pages/chasingmars/index.html
Reply With Quote
  #22  
Old 05-27-2007, 11:25 PM
Steve parkins's Avatar
Steve parkins Steve parkins is offline
Member
 
Join Date: Apr 2004
Location: wa state
Posts: 2,163
Default

off topic, you know of a glass called borax its 2 years new to most but its wining the war over e glass and s glass ?
and I'm getting the sheet on some Russia epoxy soled in oregon for 50 bucks a gal the tencal is 11000
__________________
edited by steve for a good reason
Reply With Quote
  #23  
Old 05-28-2007, 08:13 AM
Hennie Engelbrecht Hennie Engelbrecht is offline
Member
 
Join Date: Apr 2004
Location: Malaysia
Posts: 56
Default Off topic

Quote:
Originally Posted by Steve parkins View Post
and I'm getting the data sheet on some Russia epoxy sold in oregon for 50 bucks a gal the tensile is 11000?
Give us a name?
Wherein Russia?
Point us to technical information

Hennie
Reply With Quote
  #24  
Old 05-28-2007, 11:25 AM
Steve parkins's Avatar
Steve parkins Steve parkins is offline
Member
 
Join Date: Apr 2004
Location: wa state
Posts: 2,163
Default

well, I'm sorry but when we talked it was like listening to Marc when he talks fast and he did wish me to get the info.
he will bring the data sheet over today at noon and I'll post it
he did say he built a kr2 and 2 others.
i did remember something about if the glass is hard so should be the resin
the new glass is harder then e or s and there for is good to use the harder resin......o and its thinner then west slow
he asked me to goolal boron or boxen(I'll ask him the name again)
he did want to join here
you can't have to many aerospace builders
i got his card..ELEMENT aerospace development inc
as we walked past the cozy to get to the back shop he told me more about e-glass then I'd learned in 3 years
I'm picking his brain on the main gear bow
i had to put in ear plugs but i removed them when i heard him say it can be done at home
sorry for off topic please re post me...back to your wheel thing
__________________
edited by steve for a good reason
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
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 -4. The time now is 01:55 PM.


Powered by vBulletin® Version 3.6.7
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.