19 & All,
I sent two (a week apart) emails to JBC Yacht Engineering and No reply. I did not address it to -- George, perhaps I should have.
I sent the same information request to North-by-West. I received a email
from NbW yesterday. They told me that they no longer handled Hydralign and I should contact JBC.
My Requested the following:
1st, I described my Hydralign Prop. by the stamped in -- Model/ S/N.
Requested -- Owners Manual, Parts
Manual and Pricing List & any other documentation
that a owner would have received with a new propeller.
I requested (to buy) (2) tubes of grease to complete (1) service
of the hub now and a 2nd a year later & (1) Zink Anode.
I sent my request to the one & only -- JBC Contact Email
Address as listed on their web site.
** I don't have a clue about why I have not received a follow-on email from JBC ?!?
*** I have seen the Hydralign clip on You Tube on setting up of the Aperture Prop., looks simple enough.
**** I get it (now) about dialing in the pitch to .. just obtain max. engine RPM at Governed RPM. I toyed with the idea that I'd set the prop. pitch to obtain 3,400 or 3,500 RPM... In-Stead of 3,600 Governed RPM. It may be to my advantage for a slightly over prop'd. setting to conserve fuel
at my intended Cruise
RPM of -- 2,700 to 3,000 RPM.
However, I did not want to place the engine in a constant deep lug load situation. If I was testing for a deep lug in a truck, It's fairly easy to verify. If you can accelerate out of lug, you are not damaging the engines lower end (rod bearings). A deep lug pounds the hell out of the connecting rods and rod bearings. My Example >> Cummins Engine Governed Operating RPM Data for -- 855 CI Engine is >> Max. No Load = 2,300, Gov. RPM with Load = 2,100, Lowest Shift RPM = 1,650 RPM. Lower than 1,600 is the beginning of a DEEP LUG and will cause shortened engine life or component (rods) failure(s). I assume that I can apply these -- load/ torque/ hp/ rpm data values from one engine to another for a comparison study.
*** I (now) understand, that a Prop. may be over pitched to obtain these results but (may) enter into capitation (early on) to do so. I can't mount a bigger diameter prop. on my I-37. A 14 in. diameter prop. is about the max. size D. with the 15 % dia. keel
Thanks A Lot,