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Author Topic:   Longshaft Outboard
Wart posted 08-19-2004 03:07 PM ET (US)   Profile for Wart   Send Email to Wart  
I am thinking about buying an 11' Tender Sport.
It has a 15 horse 4 stroke Suzuki on it.
The plate above the prop is 6" below the bottom of the transom. I have heard it will cause problems.
Do you think this engine is large enough for two full grown men and fishing equipment to plane in chop?
What do you suggest?
rbruce posted 08-20-2004 08:40 AM ET (US)     Profile for rbruce  Send Email to rbruce     
You have a long shaft motor for a short shaft transom. This will cause undue draft and will prevent you from reaching planning speed.

You could use a hardwood spacer between the transom and the mounting bracket of the motor or modify the transom of you boat to level the antiventilating plate with the hull of the boat, or better placing the antiventilating plate 1/2 an inch above the bottom of the hull.

My Sport 11 has a 20 HP but from 1969. I would guess that it only reaches 15 HP at the propeller, My brother and I both at 75 kilograms plus a small ice box and other stuff can reach plane after a while, but our motor is a short shaft trimmed out one hole, and the boat seems to run faster and get into plane quicker.



MarkCz posted 08-20-2004 12:16 PM ET (US)     Profile for MarkCz  Send Email to MarkCz     
How about one of these.
This cast aluminum offset type jack plate is designed for clamp-on mount outboard motors up to 40 hp. This unique design improves performance and handling of smaller or lighter boats. The Mini-Jacker also allows mounting of long shaft motors to shorter height transoms. Mini-Jacker mounts to boat transom with bolts and then engine is simply clamped and/or bolted on. The Mini-Jacker stands off transom 4". The engine mounting surface is 11.5" wide x 10" high and features a vertical offset of 3". The overall width of transom mounting flanges is 17".
$ 75.99
PeteB88 posted 08-23-2004 08:45 PM ET (US)     Profile for PeteB88  Send Email to PeteB88     
I too have a 11.5 that I remain undecided regarding best motor/hp/brand. I got it earlier this year and have run my trusty old Johnson 9.5. It will NOT plane w/ two people and fishing gear on board which drives me nuts. However, I took my fishing dog (Std Poodle) on the last trip, kept him over the bow hatch, moved full fuel tank forward of seat (amidships), kept tackle and rods back with me. That little sucker took off like a bonzai warrior - compared to two person configuration - and we had a blast.

I remain undecided however; should I get a newer 20, 15, 2 stroke, 4 stroke (boat yard "experts" disagree that they might be too heavy for 11.5) Yamaha or Merc.

IF there is a Whaler shrink out there - I need ya!!

In any case, for hard core in-land lake and clear river fishers these are fantastic boats. I will be venturing out on to Lake Mich as soon as I get the power figured out.


JohnJ80 posted 08-23-2004 11:09 PM ET (US)     Profile for JohnJ80  Send Email to JohnJ80     
I'd buy something else. That isn't going to work well at all. The motor and the boat are not paired up well.

You are going to have all sorts of ride problems, potential stability problems with the AV plate so very low in the water. The drag of an additional 5" of lower unit in the water is huge. I would be surprised if you got it to plane and if it did, the boat trim would be pretty bad.


rbruce posted 08-23-2004 11:48 PM ET (US)     Profile for rbruce  Send Email to rbruce     

Get a quotation for a Honda BF 20 D at 106# and 4 stroke. Also get a quote for a Tohatsu 18 4 stroke.

Mine is a Chrysler 20 and it will take some loading on the bow to get it into plane with a loaded boat but it will definitively plane.



rbruce posted 08-23-2004 11:49 PM ET (US)     Profile for rbruce  Send Email to rbruce     
But the gasoline and oil usage is quite heavy in 2.5 to 5 hour errands because it is an old league two stroke!
Wart posted 09-01-2004 11:48 AM ET (US)     Profile for Wart  Send Email to Wart     
I took a test run in the 11' Whaler with the 15 Horse longshaft Suzuki 4 stroke. The bow lifted up dramatically
and water splashed back over the transom as we got on plane.
The motor seemed to have a hard time.
I guess I should try adjusting the tilt.
JohnJ80 posted 09-01-2004 04:47 PM ET (US)     Profile for JohnJ80  Send Email to JohnJ80     
I doubt adjusting the tilt is going to do any good at all. You've got a whole lot of lower unit way down deep pushing on a lever arm that is way too low. If you are getting water over the back then that bow has to be going WAY up and that goes to a safety factor too.

I think I would look for a different deal or if it is a good one, get some dealer to look at taking the motor in trade and put the right length shaft on the back.


PeteB88 posted 09-01-2004 06:19 PM ET (US)     Profile for PeteB88  Send Email to PeteB88     
If the deal is good, buy the boat, sell the motor, buy a short shaft 15, 20 or 25. Higher the better. Make a deal, write a check, go have fun, help a bro who's looking for a long shaft OR you could by my vintage Grumman Combo II 13 ft, combo motor, sail and row w/ 18 ft mast - extremely cool boat that wants a long shaft. Own something cool and unique.

good luck

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