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ContinuousWave: Whaler Performance
Trim Tabs vesus engine trim on 22'
|Author||Topic: Trim Tabs vesus engine trim on 22'|
posted 08-22-2001 10:46 PM ET (US)
What is the best combination for Trim tabs and engine trim. Should I raise and lower the motor before I adjust the trim tabs?
posted 08-23-2001 08:03 AM ET (US)
I've found on my 22 that I'll trim the motor down (tuck it in) a little as I am coming down from plane, so the next time I go back up on plane, I have plenty of bite. This has become more important now that I have raised the motor two holes up from resting on the transom. Then once I'm back up on plane I'll trim the motor up to neutral trim or a little higher and leave it there, using only the tabs to adjust or correct boat trim.
posted 08-23-2001 08:05 PM ET (US)
Just curious, how much is 2 holes up? My engine is raised about 2 inches off the transom on an 18'.
posted 08-23-2001 08:38 PM ET (US)
2 holes up on my 225 Evinrude is about 1 1/2 inches. 2 inches may be three holes. On my motor, and I think it's pretty standard, the motor was through-bolted to the transom with the top of the engine mounting bracket resting directly on the top of the transom. The engine mounting bracket contemplates four bolts; the top two bolts have specific holes in the bracket and the bottom two bolts go through vertical slots in the bracket. The engine was bolted such that the top two bolts were in the top holes (out of four on each side) and the bottom two bolts were in the tops of the vertical slots. I loosened the bottom two bolts so the bracket could slide up the transom once loosened, then took the nuts and washers off of and pulled the top two bolts forward so they were clear of the holes they had been in in the bracket but were still resting in the holes in the transom, raised the motor enough that I could push those two bolts back through the third holes down on the bracket rather than the top hole and re-tightened the nuts and washers.
That put the motor two holes up from where it had been installed.
posted 08-23-2001 08:45 PM ET (US)
What this is all about is raising the motor to its most efficient height, which I understand is where the cavitation plate is about 1 1/2 inches above the lowest point of the transom, if you run a straight-edge along the keel and project that line back to the front of the lower unit. 2 holes up has raised my cavitation plate a little over an inch above that point/line, and that's close enough for me for now.
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