REFLECTOR: What would you do - not do?

[Ron Brown]

Mark Machado answered this question about 5 years ago.  He said the 45 
degree cut was not for strength issues but rather made it easier to get the 
tapes to lay down tight into the corners.


----- Original Message ----- 
From: "Alex Balic" <alex157 at pwhome.com>
To: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
Sent: Tuesday, February 28, 2006 9:17 PM
Subject: RE: REFLECTOR: What would you do - not do?


> For some tapes the strength will be the same- but the major benefit  of
> cutting on the boas is that at 45 deg. fiber orientation the fibers do not
> cross the joint at 90 degrees, and so the bias tapes can easily form into 
> a
> fillet because the fiber bundles are being bent at only a percentage of 
> the
> fillet angle, and are able to better transfer loads across the joint.
>
> Alex
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of John Dibble
> Sent: Tuesday, February 28, 2006 6:49 PM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: What would you do - not do?
>
> I like the pre-made fiberglass tapes that Aircraft Spruce sells.  They are
> not cut on
> a 45 deg bias, but ( I hope I am not opening up too big a can of worms 
> here)
> I have
> done the math and I believe the strength is the same no matter which way 
> the
> "grain"
> is positioned.
>
> John
>
> Andrew Ellzey wrote:
>
>> I found a cheep way to make a 96" long 1 1/2" diameter sanding tube. When
>> you are building your canard you are told to sand the 1 1/2" radius on 
>> the
>> rear of your canard where your elevators mount, with a 1 1/2 shipping 
>> tube
>> or something suitable. I found that finding something 1 1/2" OD that was
>> straight and didn't cost an arm and a leg was a tall order. What I
>> discovered was that a fluorescent light bulb (5.95) was exactly 1 1/2" OD
>> and about as straight as you can find. I attached my 80 grit sand paper
> with
>> double backed carpet tape. I know that this sounds fragile, but what I
> have
>> found is that the sandpaper helps to protect the bulb. I also have found
>> that because it is so light, you have better control over how much foam
> you
>> are removing, helping you to find the high spots.
>>
>> Andy Ellzey
>
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