Nineteen & All,
Wow, that's great, other than a prop. strike... you're doing A Ok with your Hydralign ? I thought the Hydralign was/ is a well built (tough) design and you gave me a testimonial of this fact. You stated, it goes from fwd. to rev. smoothly.
1. Does it have good thrust in reverse as well ?
2. I will email
George at JBC Yacht and see if he will provide/ sell me a Operator Booklet & Instructions to Re-set the pitch for my Model A Hydralign. I sent out a inquiry to West by North, a 2nd vendor of the Hydralign but nothing yet.
3. I know I will need to change my pitch to 9 or 10 degree's. The prop. was bought & set up for a 22 HP engine
on a Nor 'sea 27 sailboat at 10K hull
weight. I have a Islander 37 MS with a 50 HP Perkins
@ 14,900 hull weight.
I had my I-37 run by two different prop. vendors and was spec'd. @ 14 Dia., Pitch 09 or 10 degrees.
Closing, I expect to have my 14 in. Hydralign in my hand by Sat. or Monday. I have found a couple clips of it on YouTube. I want to service it with grease & install it on my I-37.
I have been in the track & balance business for 35 years on helicopters & airplanes. I want to check the current
fixed -- 14 in. Dia., 3 blade
prop. out for vibration levels @ 1,500, 2,200, 3,000 and 3,600 Engine RPM
. I have a 1.5 to 1 ratio gearbox
. My Prop. shaft speed should be -- 750 /(1500 Eng. RPM), 1,100 /(2,200) 1,500 /(3000) and 1800 /(3,600). I want to establish a data base on the current installed propeller. I may add weight to the present 3 blade
prop. if it's too high in inches per second (IPS). The acceptable range for a aircraft prop. is around 1.0 IPS or less. I assume that a boat prop. is around the same value in IPS's, perhaps a little higher.
After I establish a fixed blade data base, I'll install the Hydralign Prop. I'm interested in seeing the Vibration Levels on the Hydralign. One must account for the newly greased hub and gave the prop. run time to distribute the grease internally inside the hub assembly. Also, the prop. shaft alignment, shaft bearings, output drive box, engine mounts have an influence on the overall vibration output.
Anyway, I'd plan on doing a vibration analysis for my I-37 and tweaking it down too a low value vibration output. Having a low level vibration level running propeller in a aircraft is a very good thing; it cuts down on -- prop. cracking/ failures, engine mount cracks and cowling cracks, etc. .
Thank You for Your Information on your Hydralign Propeller.