I have a "seal 28" and I need your help in choosing the size of 3 blades propeller for her

Nanny engine 21 hp zf10m 2:1 ratio transmission 1"shaft

thank you very much

nissim

Aztec, Seal 28 nr. 26 has a Beta 20 3 cylinder engine and I have a 13 x 9, 3 blade prop. The engine revs to 3600rpm max.

This arrangement gives me just under 7 knots in calm conditions, good stopping power and drive in rough seas.

If you PM me with your email address I can send you a propeller calculator spreadsheet.

Mike

Mike Edwards

Seal 28 "Aztec"

It seams we have the same engine preforms

My question is do the engine rich 3600 rpm

and if the answer is yes do you have black smoke or the water that are coming from the egzoze are black when you run in 3600 rpm

my Email is nissim94@gmail.com

Tank you again

Nissim

Mike Edwards

Seal 28 "Aztec"

I received your Email with the attached it is very useful.

Thank you for it.

I have looked on the 20 Beta marine engine details, this engine is based on kubota and my Nanny engine is based on the same kubota.

Both have almost the same specifications.

If you have the same ratio 2:1 transmission I can take the same propeller without worrying from any trouble.

If it is right in your opinion I will do it.

thank you very much

nissim

Via Mares

Mike

Mike Edwards

Seal 28 "Aztec"

I am looking for this size of prop.

I hope to find one soon.

Nissim.

http://viewer.zmags.com/...on/dde28f6a#/dde28f6a/40 

Mike Edwards

Seal 28 "Aztec"

I found 3 blade 14"/9" propeller

What is your opinion:

To use it as is or to make it smaller 13"/9"

Thank you

Nissim

Seal 28 "Via Maris"

I am not expert on this subject but I think your engine will be revving just a little bit slower.

I would suggest it is near enough to try as it is for a season and if the engine is not reaching high enough revs on full power have it reduced a little.

I was once told that an inch on the pitch or diameter is equivalent to 200 RPM.

good luck

Mike Edwards

Seal 28 "Aztec"

I am new in the field and your feedback is very useful for me

thank you again

Nissim

SEAL 28 "VIA MARIS"

Neil Sinclair

Seal 28/27

'Andiamo of Exe'

We have here in Haifa a professional men that do this work

I do not think i can handle such a work

Anyway I believe that I am in the right way to solve my propeller problem

Many thanks

Nissim

Seal 28

"Via maris"

At last I found the solution to my propeller problem

After I replaced the propeller to 14/9 it steel did not go more then 1500 rpm

So I looked for the solution in another place and found it in the exhaust elbow,where the gases from the engine meat the sea water, it was closed with soot and blocked the way out of the exhaust gases.

I replaced the elbow ,now the engine go up to 3400 rpm and the speed is (+-)6 knots

thank you all for your answers

Nissim

Seal 28

"Via Maris"