Adjustable stab weight recommendations

[Lance Van Nostrand]

Bob,
Here's my input on the subject. Your weight is just about what I got when 
following Bob Knoll's instructions to the letter.  His videos are awesome 
but there are some improvements that can save significant weight.  Doing it 
his way (but substituting gator adjusters) seems to result in a 2oz penalty. 
A few simple mods reduces that penalty to about 1oz as compared to a 
non-adjustable.
1. the load on the stab tube is less than you might imagine.  There is no 
need to use as much microb and epoxy all along the tube channel.  Use polyU 
instead and wet the channel so it really foams.  Concentrat the glue at the 
riblets and be sparing everywhere else.  The cap needn't be made from1/4" 
balsa.  Use 1/8" balsa with 2 1/4" thickeners per side to make sure the cap 
is in contact with the tube in a few locations.
2. alternatively, if you can drill a hole for the tube before joining the 
halves, then this is lightest.  Then you only have to cut out riblet slots.
3. After completion, the center section can be cored out leaving only a the 
material that holds the tube and pin and TE
4. the adjusters needn't be attached with steel screws.  glue them and use 
nylon bolts or put a couple  #59 holes in each wing and push a tight T-pin 
thru to hold them in place while the glue dries.
5. Chuck the steel pin and replace with a 1/8" aluminum rod from the hobby 
store.

This will give a great result, with nice fillets on the stab, but minimal 
penalty.

--Lance

----- Original Message ----- 
From: "Bob Kane" <getterflash at yahoo.com>
To: <discussion at nsrca.org>
Sent: Saturday, December 11, 2004 9:07 AM
Subject: Re: Adjustable stab weight


> I'm using the Gator system also, here is what I have
> for weights:
>
> Each half + elevator     3.0 oz X 2
> Center section with pin  3/4 oz
> Tube and screws          3/4 oz
>
> Total weight 7 1/2 oz.
>
> Seems a little porky, but then so am I :)
>
>
> --- Bob Kane <getterflash at yahoo.com> wrote:
>
>> Has anyone ever weighed their adjustable horizontal
>> stab before mounting it to the plane? I have almost
>> finished making the stab of my Temptation project
>> removable and adjustable using the technique
>> described
>> by Bob Noll in his "Perfect" series of tapes. My kit
>> is the deluxe version, pre-sheeted stab and wings.
>> The
>> completed stab seems heavy, but there is a lot of
>> hardware involved. I'm interested in the weight of
>> both the halves and the center section including the
>> tube, thanks.
>>
>> =====
>> Bob Kane
>> getterflash at yahoo.com
>>
>>
>>
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>
>
> =====
> Bob Kane
> getterflash at yahoo.com
>
>
>
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