mikehibb
regular
Reged: 23/09/2007
Posts: 379
Loc: Turkey Azerbaijan and Georgia
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Just curious really, only need it to pootle about.
Tender is Plastimo 2.6m flat bottom with wooden floor (not slats) O/B is new 3.5 Tohatsu 2st short shaft.
(yes I know that I will need to run it in for a few hours first before opening it up) Well it will if it gets delivered in time, should be arriving next week.
Thanks in Advance.
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DogWatch
regular
Reged: 10/09/2004
Posts: 9164
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We have slats in a similar sized dinghy. We have a 2.5hp motor, previously 2.2.
Alone in the dinghy I reckon 4 knots, but it is rare that I would use it as such. Loaded much less, the most important thing is to stay dry and I tend to throttle right back and just cruise in and maybe 2 knots or so, once it starts splashing over the bow it stops being fun, especially if you are in good gear or have shopping on board.
I don't think speed is an issue until you get to little ribs where you are sat at a console and get up on the plane, before that the wet / not wet rule comes into play. Just my thoughts.
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landlockedpirate
regular
Reged: 28/11/2001
Posts: 865
Loc: North West
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It wont quite get on the plane, so I would expect 4-5kts 1 up WOT. You will probably get a much more economical 4kts at 1/2 throttle though.
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Mark
I don't have a tag line, cos all my imagination is being used dreaming of my next boat. 
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MM5AHO
regular
Reged: 01/10/2007
Posts: 194
Loc: Central Scotland
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Our tender, tied to the yacht stern seems to do approximately the same speed as we do. I've never figured out how it knows how to regulate that, but when we are gunnels under, creaming along, it always keeps up, and when almost becalmed, it still never overtakes us, just stays about the same distance behind. Amazing!
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Geoff
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alldownwind
regular
Reged: 10/08/2004
Posts: 1262
Loc: Medway
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I have the same outfit except the dinghy is a Quicksilver. One-up, on smooth water, it will plane and then go b****y fast, if you sit right forward. Two-up, though, no planing.
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Pasarell
regular
Reged: 18/01/2007
Posts: 212
Loc: Solent
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I have the same engine on my 8ft (light) GRP cathedral hull tender to get to and from the mooring. It does exactly 5 knots but doesn't quite get onto the plane. Haven't measured it with the inflatable but imagine it could plane 1 up and go quite a lot faster.
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William_H
regular
Reged: 28/07/2003
Posts: 3519
Loc: West Australia
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From theory the max speed will initially depend entirely on the weight in the tender. I think even one adult will stop it from true planing. However if it was skippered by a light weight child then the tender could plane in which case the top speed will probably be limited by the propeller pitch and max revs of the motor. One would assume this size of motor would have the prop pitched for low speed max thrust. olewill
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roly_voya
regular
Reged: 05/02/2004
Posts: 1049
Loc: Pembrokeshire Wales
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I have a 2.65 with blow up keel and 4hp engine, It had max speed of about 5kn and would not plane even one up untill I fitted a spaller prop 6.5x6 instead of standard 8x8.5. Dingy is transformed, now planes at 12kn 1up and about 8kn 2 up still planing.
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alldownwind
regular
Reged: 10/08/2004
Posts: 1262
Loc: Medway
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Quote:
From theory the max speed will initially depend entirely on the weight in the tender. I think even one adult will stop it from true planing. .....
I'm 13 stone and I can assure you that mine planes, one-up.
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mikehibb
regular
Reged: 23/09/2007
Posts: 379
Loc: Turkey Azerbaijan and Georgia
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Many thanks all, 4 knots will be fine for what I need.
However I am only 12 stone so might see if I can get it on the plane. The nephews will be over later in the week so no doubt they will get some fun out of it.
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