> Paul I agree with all your comments.
 > I find hard to believe that a manufacture of aircraft equipment can
produce a PSRU being so heavy!  We are all looking for a PSRU that can handle
the torque of a 13b at say 6500 rpm with an output of around 250hp . There
seems to be many manufactures willing to sell their brand of PSRU to the home
builder and they all seem to be over price except the unit offered by Tracy
Cook.
 > In the marine industry I can buy a marine reduction gear with a higher
duty cycle than an airplane  with oil lube pump, reverse gear and cooling for
$1200.00US and weighting 35lbs.
 > Tracy Cooks unit looks to handle all we rotarians need and we should all
work with a supplier of equipment to achieve a competitive product that we
all can use and benefit from the results.
 > Don Dunbar >>

Don:
Do you have a web address of the marine reduction gear you are talking about
here "In the marine industry I can buy a marine reduction gear with a higher
duty cycle than an airplane with oil lube pump, reverse gear and cooling for
$1200.00 US and weighting 35lbs.
Rich Gillen

Hi Rick.
The marine box is made by ZF of Germany and the web page is WWW.zf-marine.com
Some of the information is different to what I have on gas engines and they are reviewing their range.
The model is the ZF25 or the HSW 250H, this is a hydraulic box with clutch packs.
This box has a hydraulic pump so a cooler could be place in the circuit.
There web page has this box at 50lbs.
The ZF25M is a manual box and is 40 lbs, the rating for gas engines is are higher that the published diesel ratings.

Regards Don

I think this is the same company as Hurth and is what Jon is using.
The web site is hard to navigate. These look like spur gears.

Paul Lamar

 
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