Finally the first PSRU with a reduction of 3.12 to 1. Pictured is
the basic box which is heavily based on Tracy’s PSRU but with the larger
reduction and 2 oil lubricated thrust bearings on the prop shaft
instead of a single sealed roller bearing in Tracy’s. This psru will mount
directly in place of Tracy's 2.85 reduction PSRU with no
modification.
Now
to put to test to see if the practice matches the theory. Already found
one fault. The “O” ring seal that seals the main body of the PSRU to the base
that attaches to the mounting plate is outside all the attachment bolts, which
means that the oil can wick down the bolts and make a lovely mess of your pride
and joy. Now looking for more faults as this is easily fixed. Unlike
Tracy's , this PSRU is totally sealed with O rings to ease dismantling with no
clean up of whatever gasket sealer you have had to
use.
Now
the terrible part and still undecided as I am yet to cost a damper on the
drive. Sadly it also is not cheap and may yet cost near $500 for a ”bit of
rubber”. Then comes a mounting plate as made by Geoff Doddridge which he
sells for around $400 USD. There is no point in me trying to compete with
Geoff as he does a magnificent job at a cheap price. Freight is always a
horrible price so he makes the plate and there is no freight from Aust to
be added.
The
total cost in Aust dollars (including Geoff’s plate) will be around the $5000
which equates to $3500 USD. Then freight of possibly $200. Currently
looking at further reduction in price if you source the gear set locally saving
on freight both ways to Aust and back. I will have to alter the way it is
constructed so that all the mods can be done by you the builder. Still
looking!
So
far the progress.
Neil.