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Old Apr 25, 2010, 05:35 PM
Claus at Area 52
clausxpf's Avatar
copenhagen Denmark
Joined May 2002
2,534 Posts
Build Log
The BD-5 ---edf 70mm

As it is not finished yet it should be here in its own build log.
it is not a tested way of building but i like to go to the edges, to see how far we can push things.
we have minimized the thicknes of the foam core to 6 mm ( less than 1/4 ") and it looks ok even to work with but with one limitation.. one have to have the glass inside before sanding the outside to finished shape.
the foam we have used is 4 inch thick, and a template at each side to cut it
cutting is started with biggest outside first and smallest inside ... then the "chease cutter" to correct the "difference" working out from the middle to the edge.
our 14 days of work acivement.
Ron and Claus
at area 52
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Old Apr 26, 2010, 01:34 AM
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kimhey's Avatar
nøtterøy, NORWAY
Joined Mar 2006
1,171 Posts
great!

I built the BD-5 from parkjets.com.

Your version looks so much better! You just inspired me to get started on a new project
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Old Apr 26, 2010, 06:17 AM
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Glong-flyer's Avatar
Ballarat, Australia
Joined Jan 2007
347 Posts
Very nice work keep it up
Pete
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Old Apr 26, 2010, 09:23 AM
Claus at Area 52
clausxpf's Avatar
copenhagen Denmark
Joined May 2002
2,534 Posts
todays installation of the ducting and the fan unit.

having all the parts done there was only to put it in the plane with glue for the final placement. It worked out pretty well and simple.
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Old Apr 26, 2010, 09:54 AM
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eatond's Avatar
United States, MO, St Charles
Joined Nov 2002
1,751 Posts
Hi Claus,
What weight cloth are you using on the inside? Are you using epoxy or WBPU to coat the cloth?

I'm interested in trying this technique but too much in the queue right now to get to it.

Dan Eaton
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Old Apr 26, 2010, 11:55 AM
Claus at Area 52
clausxpf's Avatar
copenhagen Denmark
Joined May 2002
2,534 Posts
Dan
I am now using 49gr/m2 ( 0.16oz/feet2)
i have tried the wbpu but it is hard to keep in place and the cure time for the real stregth is long, so now i am using airplane grade epoxy, it is a little more sticky and one more thing i cut the pieces into 8 inch wide bands with a ½" overlap to make it easy to get in place.
a little extra trick is the 3M replaceble spraymount on the fiberglass to hold it in place on hard to do forms.

1/4 " foam thickness is what it takes to make "timber" when it is glassed both sides.
but do not try to sand the outside to shape before the inside glass have hardened.

Claus
at area 52
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Old Apr 26, 2010, 12:56 PM
Carbon fiber is our friend
Steve C's Avatar
United States, CA, Lodi
Joined Feb 2001
4,212 Posts
Nice project Claus.

Your NACA ducts look good. The lip on the back edge can be cut back and rounded more if you need more static thrust. Don't expect miracles though. Mine doesn't do too well until it's flying.

Steve C
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Old Apr 26, 2010, 01:16 PM
Claus at Area 52
clausxpf's Avatar
copenhagen Denmark
Joined May 2002
2,534 Posts
Steve
i am well aware of that! My work with the Windrider model of BD-5 have shown to me that there is gain in doing the inlet propper, even only modiffiing the the stock one.
Claus
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Old Apr 26, 2010, 09:00 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
20,763 Posts
very nice Claus ...im trying to get the Draken Thread moved over here. hows the Draken going ?
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Old Apr 27, 2010, 05:22 PM
Claus at Area 52
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copenhagen Denmark
Joined May 2002
2,534 Posts
this is next to speed building.

just a few updates on the project.
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Old Apr 28, 2010, 05:29 AM
My project: FAIREY DELTA 1
Erik v. Schaik's Avatar
Uden Volkel, Netherlands
Joined Dec 2003
4,976 Posts
I already thought on previos pics this is a big plane. 70mm fans can have 90mm edf sized jets easely.

good work!

Erik
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Old Apr 28, 2010, 11:25 AM
Scratch builder
USA, PA, Telford
Joined Apr 2004
1,347 Posts
Hi Claus!

Does the inner duct walls seal around the motor?

Will the low pressure in the duct pull cooling air through the motor?
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Old Apr 28, 2010, 12:37 PM
fltlevel450
Georgia
Joined Dec 2006
20 Posts
no seal to the motor to the inner duct sides.
the way WM 400 is done with cooling of the outside of the motor through the airgab between the housing and the motor, ending right in front off the fan..means suction from through the the not sealed inside "walls" als well as through the motor.
this one is not pure perfect but will work ok.
Claus
at area 52
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Old Apr 28, 2010, 05:15 PM
Registered User
Joined May 2007
221 Posts
Claus very interesting 70mm build. I really like the BD5j version. Will there be plans or drawing available for this size aircraft, or even 90mm edf
Carl
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Old Apr 28, 2010, 06:47 PM
fltlevel450
Georgia
Joined Dec 2006
20 Posts
Carl .
lets have it into the air first then we can talk.
Claus
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