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Time to re power
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| Phil T |
Posted on 08/17/15 - 10:54 AM
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Nice photos.
5500 rpm is right on the sweet spot.
Are you happy?
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| Backriverexpress |
Posted on 08/17/15 - 11:47 AM
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Love it !!!!
1970 Katama |
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| Backriverexpress |
Posted on 08/17/15 - 11:49 AM
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I will give a write up when I have better service
1970 Katama |
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| Finnegan |
Posted on 08/17/15 - 1:53 PM
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What is the gear ratio of the engine? Speed seems kind of high for a 17" or even 19" pitch.
Edited by Finnegan on 08/17/15 - 1:54 PM |
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| Phil T |
Posted on 08/17/15 - 3:17 PM
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Larry -
For the 90HO the gear ratio is 2.00.
I helped him (with some help) on the prop suggestions offline.
Edited by Phil T on 08/17/15 - 3:18 PM |
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| Finnegan |
Posted on 08/17/15 - 4:23 PM
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Not being familiar with BRP engines, thanks for that information, Phil. The reason I asked is because any outboard running a 2.00 gear ratio, including several that I have with that very common ratio, would need to be turning a 21" pitch prop to achieve 51 MPH at 5500.
I know that Tom has said for years that these Stiletto Advantage I's run effectively 2" more pitch than marked (probably because of very aggressive cupping), so an effective pitch of 19" would give more like 46-48 top end speed at 5500. That has been exactly my own experience when running 19's on these engines. Mercury's propeller charts also bear out those numbers.
I do know that these old 16' hulls do run faster than the 17's, so I'm sure 51 MPH could be obtained, but it seems to me a 19" Stiletto (effective pitch of 21") would be needed to get there with the 90 HO. And I have one for sale also!!!
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| Backriverexpress |
Posted on 08/17/15 - 7:14 PM
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Ok so .... I used speed box app ????
Could it be off ???
Not sure ???
I know that it showed 51 solo and about 48 with my wife in the boat
She is 5 foot nothing ;)
Did I just have an amazing day towing my kids all over the place without the old blue smoker on the back
WELL HELL YES ;) !!!!!!!!
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| Joe Kriz |
Posted on 08/17/15 - 7:57 PM
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Backriverexpress wrote:
Did I just have an amazing day towing my kids all over the place without the old blue smoker on the back
WELL HELL YES ;) !!!!!!!!
That's what it's all about. Whether you are going 40mph or 50mph.
Speed test are never totally accurate because of wind speeds, current speeds, etc.
Speed Over Ground or Speed Over Water.. All have to take into account the wind and current speeds.
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| Backriverexpress |
Posted on 08/17/15 - 8:39 PM
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Thanks Joe, I'll add some photos to my photobucket later this week
1970 Katama |
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| Backriverexpress |
Posted on 08/18/15 - 3:29 PM
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Ok just added a pile of photos ( I think service is terrible here )
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| Phil T |
Posted on 08/18/15 - 4:50 PM
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You come here (KY) and I will go there, enjoy your boat and crap service. Ha Ha!
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| Backriverexpress |
Posted on 08/18/15 - 5:15 PM
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Phil, two unreal Maine days on my father in laws lake
Ok .... Now tonight "Speed Box" would only show 48 MPH
However the water had a ripple on it and it would send it into a wobble
So ????? Not sure I would say top end is 48-50 somewhere ;)
Not sure if the pix loaded
Edited by Backriverexpress on 08/19/15 - 6:16 AM
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| Backriverexpress |
Posted on 08/19/15 - 6:34 PM
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Ok sorry .... Photos are now on Photo bucket
http://s103.photobucket.com/user/back...aler/story
I will add more later.... just got home from the lake.
also will give details on the weight of engine and handling of the boat....
Edited by Phil T on 08/20/15 - 9:45 AM
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