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ContinuousWave: Whaler Performance
Outrage 17 II, does it need trim tabs
|Author||Topic: Outrage 17 II, does it need trim tabs|
posted 06-10-2004 04:00 PM ET (US)
My Outage 17 II with Yamaha F115 (four stroke) and Ballistic 19 x 13 3/8 prop makes 46 mph at 5800 rpm. This is fine by me. But the hole shot is a little slow in my opinion. (I was used to ride with a Montauk with a 90 2-stroke).
Will an installation of trim tabs help to have a faster acceleration of the boat?
posted 06-10-2004 04:15 PM ET (US)
I have the same boat, but with an Optimax 135. Is the speed your registering on a GPS or from a paddlewheel? It seems a little high for the thoereticals on this boat/motor combo.
That said, my holeshot improved dramatically when I raised the engine. It was originally mounted all the way down. Raising it 1 hole improved holeshot and the ride. No effect on top speed, but good effect on trim range. I no longer have to trim out as far to get my top speed.
Check your wake. Is it flat with minimal side spray from the engine? If not, raising may help. I would thing tabs a waste on this small of a boat, unless you regularly travel with heavy loads.
posted 06-10-2004 05:02 PM ET (US)
The speed is measure by GPS. My motor is mounted on the second hole seen from the top. This speed is about the maximum you can get out of this motor / boat combo. I'm very please with the performance of the Ballistic prop. With a standard Yamaha SS prop (black version), the WOT speed was only 42-43 mph.
I can trim the boat very well, but I'm curious if it is possible to increase the acceleration.
posted 06-10-2004 06:18 PM ET (US)
Trim tabs will not help in the acceleration department...they will keep the bow down during hole shots, however.
posted 06-11-2004 12:22 PM ET (US)
Backlash is correct. Trim tabs may reduce your time to plane, but will not improve acceleration.
posted 06-17-2004 03:34 PM ET (US)
Thank you very much for your replies. Something is still not clear for me.
Acceleration is the increasing of speed per second, or to say it in another way, the time you need to get your boat from 0 to a speed of 30 knots. When a boat gets faster in plane, in my opinion the boat will reach the 30 knots in less time.
Is this theory right? and will trim tabs help to get my 17 Outrage II faster on a speed of of 30 knots? Replies are very welcome.
posted 06-18-2004 12:40 PM ET (US)
linhans - There are several issues involved here. Incidently, I have the same boat with a 115 Johnson - and have never considered putting on tabs - but our uses may be different. I use my boat for family "dinking" around, camping, photography and fishing on relatively large inland lakes - with up to 5 people on board.
Your comparison / base is not comparible to your current boat. That is, the Montauk is much lighter than the Outrage and you may have a heavier people/gear load in the Outrage as well. And the four-stroke Yamaha is considerably heavier than the two-stroke on the Montauk. I suspect the significant difference in weight is the biggest factor in your comparison.
Tabs will help to get on plane because of the increased lift of the stern which alters the attitude of the boat - but - also induces more drag (protrude into the water) in every case - from slow to fast speeds. While tabs may help get on plane, they would also slow down the boat because of the increased drag. Therefore, this presents a trade-off regarding "average" acceleration to 30 mph - getting on plane faster but inducing more drag. Therefore, I can't say which is controlling - and if the tabs would improve the "average" acceleration. ---- Jerry/Idaho
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