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RE: DUCTED FAN JETS - 5/27/2008 3:46:25 AM   
joeflyer



Posts: 1460
Joined: 12/15/2001
From: Plymouth, MI, USA
Status: offline 		Doc,

You'd be better off asking that question in the Batteries & Chargers Forum.

Joe

(in reply to retrodoctor)
       Post #: 676

RE: DUCTED FAN JETS - 5/27/2008 4:14:43 AM   
retrodoctor


 

Posts: 3
Joined: 4/26/2008
From: San Diego, CA, USA
Status: offline 		Darn it, where is that and thanks for telling me. I am new to this. Dam that's funny. I'm in the wrong section!

(in reply to joeflyer)
       Post #: 677

RE: DUCTED FAN JETS - 5/27/2008 2:28:29 PM   
joeflyer



Posts: 1460
Joined: 12/15/2001
From: Plymouth, MI, USA
Status: offline
http://www.rcuniverse.com/forum/forumid_84/tt.htm

(in reply to retrodoctor)
       Post #: 678

RE: DUCTED FAN JETS - 6/1/2008 11:29:14 PM   
Steven H


 

Posts: 58
Joined: 4/17/2002
From: Longview, WA,
Status: offline
quote:

ORIGINAL: joeflyer

CA. I had about 1/4" overlap, roughed up the shiny side with some fine sandpaper, then applied the CA. Make sure your seam is on the top.

Mylar works well with a Byron fan. For a tractor fan I'd use something stiffer like a thin fiberglass sheet, similar to the polyply that BVM sells.

Joe


Well I just fire the engine for the first time after makeing a thrust tube out of mylar. It started to come unglued at the tail end after just a short run. I roughed up the mating faces just as was suggested. Should I have let it set up overnight? Is there another type of glue that would work better?

thanks,

Steve


_____________________________

You can't fix dumb

(in reply to joeflyer)
       Post #: 679

RE: DUCTED FAN JETS - 6/1/2008 11:58:46 PM   
skyhawknut


 

Posts: 490
Joined: 6/9/2002
From: Surrey, BC, CANADA
Status: online 		Tape it.

(in reply to Steven H)
       Post #: 680

RE: DUCTED FAN JETS - 6/2/2008 12:40:03 AM   
Tomcat_104


 

Posts: 621
Joined: 7/30/2003
From: Charlotte, NC, USA
Status: offline 		Tape is a good idea, I always epoxy mine but I see no reason why you can't do both.

David


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David

(in reply to skyhawknut)
       Post #: 681

RE: DUCTED FAN JETS - 6/2/2008 12:59:23 AM   
joeflyer



Posts: 1460
Joined: 12/15/2001
From: Plymouth, MI, USA
Status: offline
quote:

Well I just fire the engine for the first time after makeing a thrust tube out of mylar. It started to come unglued at the tail end after just a short run. I roughed up the mating faces just as was suggested. Should I have let it set up overnight? Is there another type of glue that would work better?


Like all CA joints you have to make sure that the seam is flat and uniformly pressed together. I clamped a straight piece of wood in a vice, slipped the mylar tube over it, and used it to suppoprt the inside of the tube while I pressed the seam flat. Additionally I wrapped some fiberglass reinforced packaging tape around the outside of the thrust tube in several places including the end.

Is your tube also supported all the way around in a couple places by fuselage formers? It has to be straight and smooth or it will vibrate. You can't have the end of the tube sticking out, flapping in the breeze either. My tube lasted me for years and over 100 flights.

Joe

(in reply to Tomcat_104)
       Post #: 682

RE: DUCTED FAN JETS - 7/23/2008 7:37:18 PM   
vnaimo


 

Posts: 5
Joined: 12/25/2004
From: woburn, MA, USA
Status: offline 		HAVE A BYRON F-16 WITH A OS 91 DF ENGINE. ALSO HAVE THE BYRO-JET FAN UNIT. I DON'T SEEM TO HAVE THE PROPER ADDAPTERS TO ATTACH THE IMPELLER TO THE ENGINE. DOES SOMEONE HAVE A PICTURE OR INFO HOW TO ATTACH THEM. THANKS

(in reply to mafrasca)
       Post #: 683

RE: DUCTED FAN JETS - 7/23/2008 11:59:42 PM   
mcdonald77



Posts: 66
Joined: 2/20/2006
From: Sedro Woolley , WA, USA
Status: offline 		I dont mean to interupt the question, but if someone is interested I have a .46 ducted fan setup in the for sale section of rciniverse at a great price.

(in reply to vnaimo)
       Post #: 684

RE: DUCTED FAN JETS - 8/7/2008 2:40:56 AM   
iflyg450


 

Posts: 259
Joined: 7/4/2006
From: townsebd, GA, USA
Status: offline 		I have never done a DF plane. I swaped a club member for a OS .25 DF engine and Fan. It runs very strong I just have one question. WHAT DO I PUT IT IN????????????????? Anyone know of a airframe for the engine?


-Jason

(in reply to chipperg)
       Post #: 685

RE: DUCTED FAN JETS - 8/7/2008 7:26:39 AM   
rcjets_63



Posts: 187
Joined: 2/26/2008
From: Albuquerque, NM, USA
Status: offline
quote:

ORIGINAL: iflyg450

I have never done a DF plane. I swaped a club member for a OS .25 DF engine and Fan. It runs very strong I just have one question. WHAT DO I PUT IT IN????????????????? Anyone know of a airframe for the engine?


-Jason


There is a great little Midwest kit called a Jetster .25. (see http://www.modelaircraft.org/museum/bio/Sarpolus.pdf which has a photo of the .45 sized version) It is an introductory DF model. Marcel Lahaie of Quebec made a .25 size version of the Mirage 2000. The problem is going to be getting a fan. The only 25 size fan I know is Kress Jets and I heard that they are shutting down the business. You might try looking on ebay to see if you can pick one up. The pipe to use is the MACS whisper pipe. I suggest that you get the powerplant/fan in hand first, then worry about the plane.

Jim

(in reply to iflyg450)
       Post #: 686

RE: DUCTED FAN JETS - 8/7/2008 1:52:14 PM   
iflyg450


 

Posts: 259
Joined: 7/4/2006
From: townsebd, GA, USA
Status: offline 		Thanks for the info I have the engine and fan in hand just need an airframe. I might shove it into on of thoes foamy jets from hobby lobby

(in reply to rcjets_63)
       Post #: 687

RE: DUCTED FAN JETS - 8/7/2008 11:16:26 PM   
Flight Risk



Posts: 272
Joined: 6/7/2003
From: private, CO, USA
Status: offline 		I just came across the Ducty, that I noticed used to sell for about $450 listed on the MECOA site for $150. There is no information and when I click to order, it shows a trainer for $79. I really don't need this but it looks like a bargain if they really have these, and they are complete with engine and fan.

http://www.mecoa.com/modelerdirect/

FR


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On a Wing and a Prayer...........and a tank of Nitro...

(in reply to iflyg450)
       Post #: 688

RE: DUCTED FAN JETS - 8/11/2008 1:50:22 AM   
juanpipito


 

Posts: 68
Joined: 10/11/2005
From: miami, FL, USA
Status: offline 		hey im selling my BVM maverick if anyone is interested, check the ads.

(in reply to Flight Risk)
       Post #: 689

RE: DUCTED FAN JETS - 8/11/2008 11:52:56 PM