Offshoreonly.com - Scarab 29 engine raise help

Page 2 of 2

Show 40 post(s) from this thread on one page

Offshoreonly.com (https://www.offshoreonly.com/forums/)

- Do It Yourself, Boating on a Budget (https://www.offshoreonly.com/forums/do-yourself-boating-budget-249/)

- - Scarab 29 engine raise help (https://www.offshoreonly.com/forums/do-yourself-boating-budget/351534-scarab-29-engine-raise-help.html)

Scarab29Aj

12-31-2017 11:10 AM

Quote:

Originally Posted by SB (Post 4602118)

Thanks for answering my second question. Could you answer the 1st ?

Sorry about that. Originally they were 350 engines.

Scarab29Aj

12-31-2017 11:17 AM

Quote:

Originally Posted by Griff (Post 4602107)

How much are you estimating the hp gain per engine???? A 5mph gain is probably about a 75hp gain per side.

If you have 1.50 ratio drives, your prop slip is very low at only 5% which is pretty unlikely for any straight V bottom boat.
I'd try some 23 Mirage Plus props spinning out and see what happens.

i did figure about a 75 hp increase a side. Just thought my new numbers vs old numbers would be further apart with the drive height change.

With the prop slip numbers i was surprised also. GPS speed was taken off the speedometer as well as phone. And tachometer readings matched laptop data?

Scarab29Aj

12-31-2017 11:23 AM

Quote:

Originally Posted by class6 (Post 4602081)

That's why I said try the rev4. A 23p is more prop than 24 bravo but goes through the water much better and the boat will probably have a better attitude. I'd try spinning in and out back to back and see where it gets you.

i will definitely try a pitch down. I had mirage +23 originally on it and first water tests would instantly blow the props out. Should have tried spinning them out right then.

All times are GMT -5. The time now is 06:01 AM.

Page 2 of 2

Show 40 post(s) from this thread on one page