Engine height w/ Permatrim

PhilR · Posted: Tue Nov 04, 2008 8:55 am Post subject: Engine height w/ Permatrim

My Honda 90 is mounted on the transom in the second hole down from the top and I have read that the Permatrim should not have water flowing over the top...mine does. Where have you other 19' Angler positioned your motors?

drjohn71a · Posted: Tue Nov 04, 2008 9:17 am Post subject:

Phil, Water runs over my Permatrims at most speeds, but they seem to work well. Was that in the instructions?

I don't know if I'd worry much about it if all works well.

John

marvin4239 · Posted: Tue Nov 04, 2008 9:33 am Post subject:

Phil when I installed my permatrim I installed a SS prop at the same time. With the boat on the trailer I put a straight edge on the bottom of the boat and trimmed the motor down until the permatrim was parallel with the staight edge. At that point the permatrim was about 3/4" below the straight edge or bottom of the boat. I tested the boat and speed and rpm was a little slower than before installing the permatrim. I raised the motor one hole which put the permatrim about 1/4" above the bottom and the boat preforms well with no loss in speed or RPM. I don't really know if this is correct procedure but it works for me. My motor is a Suzuki 90 but I don't think that should make a difference. I've read with a SS prop you can run the motor higher.

Sneaks · Posted: Tue Nov 04, 2008 10:41 am Post subject:

Sea Wolf · Posted: Tue Nov 04, 2008 10:55 am Post subject:

Sneaks wrote:

"F75 Yamahaha."

Always a joker in the crowd, somewhere!

Joe. Laughing

Sneaks · Posted: Tue Nov 04, 2008 12:04 pm Post subject:

Sea Wolf · Posted: Tue Nov 04, 2008 12:39 pm Post subject:

breausaw · Posted: Tue Nov 04, 2008 1:53 pm Post subject:

After talking extensively with a Permatrim tech at Shipyard Island Marina I moved my Honda 90 up to the center hole. Now I’m able to trim the boat level at high cruise, and gain a little speed.
The underside of the Permatrim is parallel with the bottom of the boat now, but for optimum performance was told moving the motor up a little move would improve performance even more. At this higher motor location its possible an aluminum prop could cavitate, so switching to a stainless may be necessary.
But- By increasing the size of the factory cavitation plate, by up to four times. PermatrimTM reduces the chance for the propeller to create an air pocket - the cause of cavitation.
The guy I talked with at Shipyard Island marina thinks a stainless wouldn’t be necessary given the low performance characteristic and slower speeds of the C-dory.
This spring I’ll move the motor to the top hole, if cavitation occurs I’ll most likely drop it back down.

thataway · Posted: Tue Nov 04, 2008 2:15 pm Post subject:

Our Tom cat has the Permatrims running on top of the water at planing speeds. However since the engine is on a bracket, it is set higher anyway. The C Dory 25 has the Permatrim submerged. My plan is to move the motor on the C Dory 25 up until the Permatrim is even with the bottom of the boat (it is close to 2" below the bottom. The problem is that I don't think that I have enough "hole" room to come up--and may have to redrill the holes--that means filling the old holes. So it is more complex than just moving the motor up a hole.

tpbrady · Posted: Tue Nov 04, 2008 4:36 pm Post subject:

Jay,

I'm in the top hole on my motor with the Permatrim about 1/2 inch above the bottom of the boat when the motor is trimmed parallel to the bottom. In normal running (less than WOT) the motor is trimmed down somewhat (the front of the Permatrim is higher than the rear forcing the bow down). I have run several props ranging from 14 pitch to 17 pitch and the only prop that absolutely wouldn't work was the 17 pitch. For some reason it could not generate the same RPM as without the Permatrim by a significant amount. When I trimmed the motor way up you could feel the Permatrim rise out of the water and the motor started cavitating immediately. The 17 pitch 3 blade aluminum prop (13.25 inches in diameter) was completely useless when operating with the Permatrim installed. I tried a 4 blade 15 pitch Solas and 3 blade 15 pitch Solas and they showed some degraded performance on the top end. The 3 blade 14 pitch stainless QuickSilver prop performed the best with the Permatrim.

breausaw · Posted: Tue Nov 04, 2008 6:42 pm Post subject:

Hi Tom,

If cavitation becomes a problem with my stock prop after I raise the motor perhaps you’d be willing to lend me that 3 blade 15 pitch stainless solas again, Wink

think that’s the one. If that salves the cavitation problem maybe I’ll opt for buying the 3 blade 14 pitch stainless Quicksilver.
You’re bound and determined to sell me on that Quicksilver, maybe Cabalas is having a sale?

tpbrady · Posted: Tue Nov 04, 2008 9:55 pm Post subject:

Jay,

I'm not alone on the QuickSilver 14 pitch for the new Honda 90. Marc at Wefings thinks highly of it also.

PhilR · Posted: Wed Nov 05, 2008 10:15 am Post subject:

Thank you all for the good info! I just checked and the top of the Permatrim on my motor is 1" below the bottom of the hull when parallel. I may try raising it one hole in the springtime. I'd like to try the Quicksilver 14 pitch ss prop....can someone give me the proper description and suggest a good place to buy it?

tpbrady · Posted: Wed Nov 05, 2008 10:54 am Post subject:

Phil,

I'm not sure my experience with the Quicksilver 14 pitch prop on a heavily loaded 22 will translate over to a similar experience on a 19 Angler. When I am light, I can get into the rev limiter on the motor if I trim it up too high. I chose the 14 pitch prop for low end performance and fuel economy when heavily loaded. I would think you would be better served with a 15 or 16 pitch prop on a 19.

However, if you want to try. Cabelas has it in their catalog. It's the only 14 pitch prop available for a Honda that I have seen.

Yosef · Posted: Thu Feb 02, 2023 10:44 am Post subject: