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Measuring for sponson alignment. Don’t bypass this step.
Sponson assembly ready for drilling.
Drilling for boom tube screws.
Sponson Alignment
*
This is a critical step in building your
boat. Make sure that you fully understand
what we are doing, and don’t skip this
step!
*
We need to make sure that both sponsons are
exactly correct with reference to the tub. If they
are off, the boat will never handle properly.
The process is simple. Take your time, measure
often and it will be fine.
Slide the boom tubes in the tub.
Measure at the front and rear.
The tubes will stick out about 9-3/16 inch from
either side. This measurement is not critical.
We want both tubes to be exactly the same
length. In other words, we don’t want any toe in
or out on the sponsons.
If they are very different, sand the longer tube
with 80 grit on a block. Assemble, measure and
sand until both the front and rear are exactly the
same.
If they are slightly off (less than 1/16 inch) simply
put the shorter tube in the front. A little toe in will
not hurt a thing. Toe out will be a disaster…
Mark the tubes front and rear if necessary.
Remove the tubes.
Put the sponsons on the boom tubes. You may
need to clean the inside of the aluminum tubes
so the plugs will fit in. Use an Exacto knife for
this.
Set this assembly on a couple of 2x4 pieces of
wood.