hey is there someone who can tell me what the original propele size for a seal 28 I did not think there is much momentum with the sitting on[:)]www.kruse-familien.dk[:)]

Hello Larskruse
Please can you explain a little more about what you are asking, are you talking about the propeller?

Mike Edwards
Seal 28 "Aztec"

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hi yes there are propeller I'm talking about most of the plan is just to sit on a seal 28 with the I sail I only 4 knots in 2300 turn hope into bear with my poor English, I use google translator

hello Larskruse
I will try and give you the details of my propeller.
Unfortunately the sizes will be in English inches.
My original propeller was 14 x 10, 2 blade, and was coupled with a 2:1 gearbox to a 12 horsepower Petter Mini 12 diesel engine.

I have replaced this propeller with a new Vetus 13 x 9, 3 blade propeller which is coupled with a 2:1 gearbox to a Beta (Kubota) 20 diesel engine.
The speed obtained in each case is about the same 6.5 knots maximum at about 3400 rpm, maybe slightly more with the 20 horsepower engine. But the 3 blades give a smoother drive and work better in rough seas. It also stops much faster when manouvering into a tight berth.
From your photographs it looks like you have the original Bukh 20 or 24, you should be able to go faster than 4 knots. I suppose you have checked you speed log for accuracy.
What propeller do you have?

Mike Edwards
Seal 28 "Aztec"

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Lars - My boat Andiamo has a 16 inch diameter X 12 inch pitch 2 blade screw. The motor is a Bukh DV20. Maximum speed is 5.5 to 6 Knots, depending on how clean the bottom is. If you also have the Bukh engine - it is possible for the speed control lever to slip on its shaft - there is no keyway - and thus limit the maximum revolutions of the engine.

Neil Sinclair
Seal 28/27
'Andiamo of Exe'

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Lars - I have just checked the Bukh motor manual. You should get 3000 RPM at full speed.


Neil Sinclair
Seal 28/27
'Andiamo of Exe'

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hi
ok it with the 3000 rpm, I was not ready over.jeg will indeed be a good friend a old engine but I have tried with several rpm. but after 2400 rpm it's just as if it just whips and come nowhere my propeller is a 16x12 but the area of leaf is not large, I have put a few pictures on my website under the pictures it could be that it helped with one minor propellers with larger surface area of leaf there is plenty of surplus power is a Bukh dv20 [:)]

Lars Kruse
seal 28 primadonna

Over to you Neil, sounds like a similar setup to yours.

Mike Edwards
Seal 28 "Aztec"

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just a thought but is RH rotation prop correct for the engine and gearbox

Mike Edwards
Seal 28 "Aztec"

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I'm not quite what you mean by RH prop correct rotation when I translate it directly into Danish[:)]

Lars
RH is right hand rotation, that is, clockwise as you look at the screw from aft. I think your screw is correct from your pictures. Mine also has narrow blades. Maybe your screw is cavitating? This is a problem for some Seal 850 boats. There is insufficient space between the blade tips and the bottom of the hull and between the screw and the shaft bearing. For the Seal 850, it has been solved by moving the screw a small distance (25 mm ) aft and by making a fairing to fit over the shaft bearing. Not so easy on the Seal 28! I will try and get a photo of my 2 blade screw for you.

Neil Sinclair
Seal 28/27
'Andiamo of Exe'

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ok it with pictures you will email them to me[:)]

Lars Kruse
seal 28 primadonna

Lars - I have some pictures for you. Please let me know your e-mail address.

Neil


Neil Sinclair
Seal 28/27
'Andiamo of Exe'

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