Subject: BD4 wing fold.
From: paul lamar
Date: 6/3/2017, 5:46 AM
To: A10-Me-Earthlink



How do the wings join together to make it cantilever? The specs list
width as
7 feet with wings folded. What does that mechanism look like?

Steve Carlisle

Not shown in the plans that I have.
I have no idea. It might be like a sailplane where the spar fits into a
socket.

Paul Lamar

The wing spar slides over the center spar tube in a very tight fit .

I have been looking for a wing fold system for it. Bede built  it just
so you could take the wing off rather than fold then others have come up
with methods of sliding the wing off the centre spa with an internal leg
holding the fuselage end of the wing up while you rotate the wing 90
degrees and fold back.  Then a contraption of some sort straddles the
rear fuselage to support the wing folded. This way fuel and electrical
lines don't need to be disconnected.

Reminder to oneself never to visit an Internet site and not download
relevant info immediately .

Speaking of that Paul I have downloaded the weight and balance graphs
for which I thank you. Weight and balance is at the perimeter of my
knowledge and as yet I don't have a copy of the plans but still just
picking the damage apart.

Having great difficulty getting in to the nuts holding the top door
hinges on. Only a tiny opening in the box there and fuel and electrical
wires run through it. Have bent a spanner to 90 degrees but still not
sitting on the nuts . Plan b to be considered . Have to get the hinges
off to remove the front side skin. Shame a large access door hadn't been
built in either side for access to the back of the instrument panel.
Some have done this.


Mark Dillner


Here is the page from the early plans on the wing fold.


Paul Lamar

That's very interesting.  I am just missing WF-2 and WF-4. Is there any
mention of the wing support in the folded position?

Mark Dillner

Here is what I have on wing support.
The more I study this airplane the better I like it.

Are you sure the wing tanks are leaking?

You might find some plastic truck fuel tanks in the junk yard that might
fit in the back seat. If they hold 30 gallons. 113 liters.
A 30 by 30 inch tank  8 inches high will hold 30 gallons.
8 CM by 8CM by  2 CM (check my conversions :-))

It is about 5 hours to Andora. So you will probably
have to make one stop for fuel at 12 gallons an hour.

Paul Lamar

A version of the Bede wing fold was designed for the BD-17 (low wing
single seater).  I am not sure that any of the five or so existing
BD-17's actually incorporated the mod.  There are plans available for
the BD-6 which apparently now sports a high-wing version of the BD-17
wing.  I don't know if there is a wing fold version for the revised
BD-6.

George Wright

My Fiat Ducato has a 20 gallon plastic tank that is roughly 24 by 18 by 14
inches thick. In theory that is 26 gallons but there are a lot of deep
ridges and valleys in it. I can never get more than 20 gallons in it.

Paul Lamar


CM I would assume is centimeters. In that case I would day you are short
a 0.

Dale Davies


I am not surprised :-) Metrics are alien to me :-)


Paul Lamar

I have been watching E Bay for a suitable alloy tank even if it's just to give me ideas. Seen some interesting alloy boat tanks that may or may not need the addition of baffles  Might just be easier to build one or two tanks designed to fit snuggly in the space but still removable to give a clean or good inspection. My tanks didn't leak recently but the log book shows issues in the past.

Mark Dillner

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