SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old May 08, 2008, 02:07 PM
Registered User
Joined Mar 2002
263 Posts
Question
Vacuum Forming Ducts from plastic???

Any reason not to?

Just thinking that this would be easier to do than having to fiberglass them.

Thanks.
nem3 is offline Find More Posts by nem3
Reply With Quote
Sign up now
to remove ads between posts
Old May 08, 2008, 02:34 PM
It wasn't me...
DanSavage's Avatar
Trabuco Canyon, CA
Joined Nov 2000
4,563 Posts
The only consideration is how you're going to prevent them from collapsing. This could be done via thicker plastic or some external reinforcement such as wrapping in carbon tow, etc.

One of the nice things about FG is that the inlets can be made into one-piece affairs and basically seamless.
DanSavage is offline Find More Posts by DanSavage
Reply With Quote
Old May 08, 2008, 02:52 PM
Registered User
Joined Mar 2002
263 Posts
But can't you glue together the to halves of plastic?
nem3 is offline Find More Posts by nem3
Reply With Quote
Old May 08, 2008, 03:46 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
20,791 Posts
yes but the best way is to have a overlapping flange on one duct ....sorta like the Sapac hawk's duct.
AIR SALLY is online now Find More Posts by AIR SALLY
Reply With Quote
Old May 08, 2008, 04:02 PM
I make bad look so good.
SteveC68's Avatar
League City, Texas
Joined Sep 2006
2,516 Posts
It's been done. Check out this build thread.

http://www.rcgroups.com/forums/showthread.php?t=727715
SteveC68 is offline Find More Posts by SteveC68
Reply With Quote
Old May 08, 2008, 09:33 PM
Registered User
Joined Mar 2002
263 Posts
Ok, then I think the next logical question is what thickness styrene do I use?
nem3 is offline Find More Posts by nem3
Reply With Quote
Old May 08, 2008, 09:51 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
20,791 Posts
what kind of power and fan size ,it appears there are a few issue's with high power set ups on the sapac hawk. so need to find out what they are using and ajust as required....but i think .045 .060 thous.
AIR SALLY is online now Find More Posts by AIR SALLY
Reply With Quote
Old May 08, 2008, 10:49 PM
Effumall
kelberts's Avatar
Joined Nov 2005
3,619 Posts
You still will probably need to shore up and reinforce plastic intake ducts in any area they are not contacting the fuse elements, to prevent collapsing. Therefore, you may lose any weight advantage over FG
kelberts is offline Find More Posts by kelberts
Reply With Quote
Old May 08, 2008, 11:05 PM
Registered User
Joined Mar 2002
263 Posts
Huh, I guess I need to start playing with this stuff. I just can't think that the plastic would be all that flexbile. But I don't see why some small balsa reinforcement would add all that much weight.

The F22 I am designing it for personally is intended for about 500 watts per fan. Each fan will be fed and expended via their own ducts. But it is also possible that this same jet may be used in a 700 - 900 watt setup.

Another question is, would lexan be a possible substitute. I do not know much about vacuum forming at this point. So please excuse my ignorance.
nem3 is offline Find More Posts by nem3
Reply With Quote
Old May 09, 2008, 08:37 AM
I make bad look so good.
SteveC68's Avatar
League City, Texas
Joined Sep 2006
2,516 Posts
Everything you ever wanted to know about vac forming and then some.

http://www.tk560.com/phpBB2/viewforum.php?f=1
SteveC68 is offline Find More Posts by SteveC68
Reply With Quote
Old May 09, 2008, 03:14 PM
Registered User
unclecrash's Avatar
white lake michigan
Joined Oct 2004
3,756 Posts
[QUOTE=nem3]Huh, I guess I need to start playing with this stuff. I just can't think that the plastic would be all that flexbile. But I don't see why some small balsa reinforcement would add all that much weight.

The F22 I am designing it for personally is intended for about 500 watts per fan. Each fan will be fed and expended via their own ducts. But it is also possible that this same jet may be used in a 700 - 900 watt setup.

Another question is, would lexan be a possible substitute. I do not know much about vacuum forming at this point. So please excuse my ignorance. [/QUOTE

You could scuff the plastic and wrap them with carbon tow like tumbler did on the T45 thread. There is a few pics of them.
unclecrash is offline Find More Posts by unclecrash
Reply With Quote
Old May 09, 2008, 07:16 PM
Registered User
Joined Mar 2002
263 Posts
Yah, thats a good idea too. I am sure between a little carbon tow and all the bulkheads that they have to go through, they should be supported well enough. I think I really need to go play with some of the different thicknesses in order to see what would work for my application.
nem3 is offline Find More Posts by nem3
Reply With Quote
Old May 10, 2008, 04:25 PM
Charged up and buzzing
vampire67's Avatar
Germany
Joined Aug 2005
531 Posts
Quote:
Originally Posted by kelberts
You still will probably need to shore up and reinforce plastic intake ducts in any area they are not contacting the fuse elements, to prevent collapsing. Therefore, you may lose any weight advantage over FG
Actually the RBC Skyray came with vacuum formed ducting.
I only used it as a plug to form some carbon reinfored fibre part inside.
Actually the fibre parts came out with half the weigth of the vacuum formed parts.

Peter
vampire67 is offline Find More Posts by vampire67
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Mini-HowTo make a vacuum forming oven from a two-burner hot plate and disposable aluminum pans drcrash The Builders Workshop 16 Jan 07, 2010 03:09 AM
Question Looking for vacuum forming plastic sheet. pezzer2003 Australia 17 Dec 16, 2007 08:33 PM
Discussion Plastic for vacuum forming large canopy? nauga The Builders Workshop 4 Apr 30, 2007 10:50 AM
Discussion Vacuum Forming/Molding Plastic Suppliers PLA0242 Slope 18 Feb 16, 2007 01:52 PM
vacuum forming on plastic models? crx_ef8 The Builders Workshop 0 Dec 30, 2004 09:58 PM