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1995 Rage 15' Conversion | Boat Plane Issue
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| gardnerf |
Posted on 07/06/21 - 11:28 AM
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Hello,
Been reading this forum for years and finally created an account to ask a question.
I have a 1995 Whaler Rage that has been converted from the Jet Drive to a new (to me) Tohatsu 50hp Four Stroke. Now that I have gone through all the work of removing the old engine, adding steering, removing and adding odds and ends I take it out and it will not get on plane. From the research I have done it looks like the motor is just too low in the water. I even added a hydrofoil and got closer, but not close enough. I am thinking the best option (because everything is rigged up at this point) would be to move from a short shaft to a long shaft on my motor. Not sure if anyone has any experience with this. Here is a schematic of the motor....
https://www.megazip.net/zapchasti-dlya-lodochnyh-motorov/tohatsu/mfs50a-15574/mfs50a-31182/mfs50a-812432/drive-shaft-housing-14628313
My question is would I just need an extension housing and a new shaft to get this job done? Or is a much more involved process? any insight would be helpful.
Thanks!
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| Phil T |
Posted on 07/06/21 - 12:30 PM
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I think you are contradicting yourself.
First you say:
"..looks like the motor is just too low in the water"
then you say:
"..move from a short shaft to a long shaft "
Do you have a short (15") shaft or long (20") shaft Tohatsu?
Also - What prop make, model and size are you running?
Take some photos and measurements of the height of the anti-cavitation plate in relation to the bottom of the keel. It should be 1-2" ABOVE the bottom of the keel.
If your engine is too low in the water, a jack plate is probably recommended.
1992 Outrage 17 I
2019 E-TEC 90, Viper 17 2+
2018 Load Rite Elite 18280096VT |
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| gardnerf |
Posted on 07/06/21 - 1:30 PM
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Sorry about that. Phil's comment was correct. I feel like the motor is too HIGH in the water. Here are some images for reference. I have the 15" Tohatsu currently. Prop that I am using is a Solas Amita 3 Blade 11.4 X 12P Propeller 5311-114-12.
From the measurements that I have done I feel that I am 2.75" above the keel. I do have 12" of jackplate installed. Any thoughts on how low the jackplate is installed essentially lengthening the keel and needing the motor to be even lower? Attaching a photo as well. Thanks!
gardnerf attached the following image:
[55.1Kb]
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| gardnerf |
Posted on 07/06/21 - 1:41 PM
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Another image with a little better lighting.
So other don't need to hunt the motor that I have is a Tohatsu MFS50A (50HP 4 Stroke)
gardnerf attached the following image:
[158.01Kb]
Edited by gardnerf on 07/06/21 - 2:16 PM |
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| gardnerf |
Posted on 07/06/21 - 2:33 PM
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Here is the Prop Guide... I feel like I have the right Prop but would be interested in another opinion.
gardnerf attached the following image:
[73.49Kb]
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| Phil T |
Posted on 07/06/21 - 3:25 PM
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For every 6" of setback one goes up an 1".
So for your setup, 2" on top of the 1-2" above the keel.
Can you place a straight board on the keel sticking out the back so you can measure UP to the bottom of the anti-cav plate.
1992 Outrage 17 I
2019 E-TEC 90, Viper 17 2+
2018 Load Rite Elite 18280096VT |
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| Phil T |
Posted on 07/06/21 - 3:49 PM
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I ran your setup (WOT of 6K, gear ratio of 2.08) through a prop calculator since I don't have any owners who tested an outboard on a Rage.
This is ballpark.
It only gives a general pitch recommendation and does not take into consideration of material, aluminum vs. stainless steel or prop blade design (chopper vs, stern liifting vs etc.)
Phil T attached the following image:
[48.96Kb]
1992 Outrage 17 I
2019 E-TEC 90, Viper 17 2+
2018 Load Rite Elite 18280096VT |
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| Phil T |
Posted on 07/06/21 - 3:51 PM
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I need to see a photo from farther away in better light that shows the bracket attached to the transom and it's location in relation to the top of the transom, start of the cap.
1992 Outrage 17 I
2019 E-TEC 90, Viper 17 2+
2018 Load Rite Elite 18280096VT |
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