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Old 06 February 2003, 12:28   #31
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Julian

Years ago, more than I care to remember, I bought 3 or 4 boats from a guy in Edenbridge, I think the house name was Pootings or something like that, it might even have been the village name.

The boats were known as Fondas, excellent bit of kit, available part built for home completion. He offered me a job once when he saw one that I had completed for a mate.
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Old 06 February 2003, 13:30   #32
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trim tabs

ribs with low seated tubes will be less prone to a glass boat at chine walking, however

with a small lightweight deep vee speedboat I have found in the past that 3 factors can produce an annoying ride, which could be cured by trim tabs ?

torque of powerfull engine can produce tilt (engine trim can help cure sometimes )

single handed driving - no choice but to sit on the right of boat giving poor weight distribution- very very annoying

certain sea conditions- never really been able to figure out why

Now with people on board you can boss them around to change trim by playing musical chairs

Surely trim tabs would give the opportunity to play around with sideways trim. All airplanes have them fitted ( ailerons) !!

Reality is they are the last thing you would think of spending money on given their price & given you may only use them occasionally
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Old 06 February 2003, 15:01   #33
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Just got in, and how we have gone from do I go with Trim Tabs yes or no?


To my mate can sort you out a second hand scorpian, is beyond all belief.


The best rib to buy is going to be a real upsetter for some and probably will be the biggest thread ever going?.So we will leave that one in the bin for the moment. As some of us will have no mates after that one hits the Net.

Your decision is based on the information here and your own conclusions,after maybe discussing it with Bennet Trim Tabbs and then see how you feel.

http://www.diy-boat.com/Pages/Archiv...rb/powerb.html

Good luck.


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Old 06 February 2003, 15:50   #34
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trimtab by BOMBARD

I never used trim tabs, but I'd seen something like that in Zodiac catalog. That's optional for their RIBs, both Zodiac and Bombard. They are no power-lifted. I don't remember the price. Friend of my and Andre, put that thing(tabs) on his Bombard DB 600, as I remember. You have to ask Andre for contact to Kurczak - He'll tell more about handling boat with that gizmo
One more thing: my other friend put trim tabs on 4,5 m Fletcher with 200 HP Mercury! With throttle on 2/3 and on calm water He was flying virtualy on tabs and propeller!!!
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Old 07 February 2003, 05:02   #35
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Scorpion

crazyhorse

I never said i could get Dirk a second hand scorpion. I told him there were a couple for sale on the website , nothing else.

Julian
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Old 07 February 2003, 10:43   #36
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I have just been out for a blast round the bay and when I got back decided to look at my tabs.
(Firstly the starboard tab wont depress-but i'll find out why and try and fix that).

What surprised me was that from hi-up to max-down, the tab seems to move remarkably little. Certainly not "big spades digging in, causing huge drag, horrible fuel consumption etc etc".

My (Bennett) tab instrument measures the tab settings from zero to 20.
IF IF this is in degrees, then the setting is likely to have the (desired) effect without, it seems, much of a penalty.

Anyone care to comment.

Brian (the one who has got to be back by 17.00 to watch tele!)
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Old 07 February 2003, 10:54   #37
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Brian, I cannot comment on how the tabs work on your boat but when my tabs are working (properly) I can bury the bow so low in the water that it laps over the tube. This came particularly handy when we were in New York using the boat as a taxi (remember that day Charles?) in the Hudson River which is full of dead bodies, logs, and complete sides of houses!! the bow would hit the debris first and give us a chance to cut the throttle before any damage was done.Alan P
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Old 07 February 2003, 10:57   #38
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Afternoon Brian

The trim tab could be lack of oil or where it has been left standing the slt could be trapped between the rams. Some WD 40 should solve this problem. We have a similar sytem with 0-20 degrees down etc. Ours dig in quite a way though. Maybe a different ram etc. Was it nice out on the water. Is your boat still in the Scorpion yard.

Julian
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Old 07 February 2003, 12:17   #39
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Alan P. / Julian

Hmmm.
I checked the Bennett website but could find no mention of angle of depression of the tab between max and min.
My rams (two on each tab) extend about 2 inches (max to min), pushing the tabs down, as I said about 20 degrees.

Judging by what you said Alan, this is by no means enough. You imply they should go down 40/60/80 degrees??
Have e-mailed their tech support for an angle figure.

Julian. What do you think your angle is (if you will excuse the question)?
What do you mean by your problem with "sit" trapping between the rams?

PS Brought Cyanide back to Torquay early December.
Torbay today was smooth, slight breeze, overcast but I was bored. Also no one out there to play with, everyone seems to be doing something called work. Whatever that is!
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Old 07 February 2003, 12:26   #40
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Tabs

Hi Brian

Sorry I made a spelling mistake, I meant Salt stuck between the rams. Ours go down 4-5 inches or so. Again like alan our bow can go down very low. Have you checked your oil resevior, maybe you need to top her up a bit.

Julian
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