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Old 30 May 2010, 06:16   #1
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What speed do you start to plane at?

I know its dependent on size, weight and power - but just curious about what sorts of speeds seem to be the norm.
I'm just getting on the plane at about 15 kts (I think it was kts it was set to when I tested ) and 3000 rpm.
Thats on a 4.7m rub with Suzuki 70.

It would be so much nice to be able to plane at harbour speed limits (10kts)

John
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Old 30 May 2010, 06:59   #2
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My 5.8m Destroyer with a Johnson 115 used to plane at about 13/14 knots. Ask me again in October
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Old 30 May 2010, 08:05   #3
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I find I can start to plane at about 12 knots depending on weight distribution.

However, I find to stay on the plane without getting knocked off it in anything other than flat calm I need to hold 19 knots.
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Old 30 May 2010, 13:40   #4
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I'm with Nos, except for the 12 kts thing. Mines more like 15 to 19 depending on load and distribution. Alone it's probably lower, but I don't usually watch speed when taking off.

FWIW, rpm at plane (for me, anyway) is kind of moot: I usually nail the throttle forward until the stern lifts, then back off to the speed I want.

jky
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Old 30 May 2010, 14:52   #5
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Quote:
Originally Posted by jyasaki View Post
I'm with Nos, except for the 12 kts thing. Mines more like 15 to 19 depending on load and distribution. Alone it's probably lower, but I don't usually watch speed when taking off.

FWIW, rpm at plane (for me, anyway) is kind of moot: I usually nail the throttle forward until the stern lifts, then back off to the speed I want.

jky
I only know because if I do 10 knots (the speed limit) in Poole Harbour it'll slip onto the plane if I lean forward too far.
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Old 30 May 2010, 15:02   #6
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Originally Posted by jyasaki View Post
FWIW, rpm at plane (for me, anyway) is kind of moot: I usually nail the throttle forward until the stern lifts, then back off to the speed I want.
+1

My Destroyer was very hard to hold just on the plane anyway - it either wanted to drop back to displacement, or would take off up to about 18kt.
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Old 30 May 2010, 16:20   #7
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We used Poole alot with our previous RIB and put smart tabs on so that she would plane at 10kts. They worked very well, the problem being that as we were planing, everyone thought we were breaking the limit!

Steve
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Old 06 June 2010, 16:50   #8
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Quote:
Originally Posted by longjohn View Post
I know its dependent on size, weight and power - but just curious about what sorts of speeds seem to be the norm.
I'm just getting on the plane at about 15 kts (I think it was kts it was set to when I tested ) and 3000 rpm.
Thats on a 4.7m rub with Suzuki 70.

It would be so much nice to be able to plane at harbour speed limits (10kts)

John
I have a 5.5m zodiac with a 90HP and thats on the plane at about 13knots.
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Old 06 June 2010, 18:28   #9
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Tabs up 11 knots
Tabs down 8 knots
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Old 07 June 2010, 03:55   #10
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13 or thereabouts
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