astra-taranis
New member
Dears,
My name is Henrique, I'm from Brazil (south america), please, sorry about my poor English.
I have a johnson 15hp 1988 (I think that have only 50 hours os less) original Long Shaft, but I make Short Shaft.
My Boat is calaca flash bass (http://www.calaca.com.br/flashbass/) with 5 meters or 16.40 feet. And weight about 90kilograms.
In original (long shaft) with 9 1/2 x 10 propeller my speed is: 20 km/h (12.4 mph) with 2 people (pilot and friend) .
In short shaft with same propeller my speed is: 22km/h (13.67mph) with same 2 people .
So I put a new propeller 9x11 pitch and my speed now are:
Alone : 38.2kmh (23.61 mph)
With 2 people: 22 kmh (13.67mph)
With 2 people , but the other person in first chair: 26kmh (16.15 mph).
So the questions are:
1- Put I make a mistake with pitch?
2- What the pitch I have to put now (9 or 10 pitch)?
3- If I buy a 9 pitch I will broke my outboard ?
4- What speed I can dream with a 9 and 10 pitch with me and other person?
5- Putting pitch 9, I'll imagine that I will get speed loaded? Today I'm 13.75mph can imagine something near 18-19mph ?? Or will not be as great progress as well?6- They said these johnsons 15hp 88 has in reality no more than 13hp, so go unless other engines like yamaha 15, you confirm that?
or I need to put this motor is garbage and buy a tohatsu 18 ?
Best regards! From Brazil!
My name is Henrique, I'm from Brazil (south america), please, sorry about my poor English.
I have a johnson 15hp 1988 (I think that have only 50 hours os less) original Long Shaft, but I make Short Shaft.
My Boat is calaca flash bass (http://www.calaca.com.br/flashbass/) with 5 meters or 16.40 feet. And weight about 90kilograms.
In original (long shaft) with 9 1/2 x 10 propeller my speed is: 20 km/h (12.4 mph) with 2 people (pilot and friend) .
In short shaft with same propeller my speed is: 22km/h (13.67mph) with same 2 people .
So I put a new propeller 9x11 pitch and my speed now are:
Alone : 38.2kmh (23.61 mph)
With 2 people: 22 kmh (13.67mph)
With 2 people , but the other person in first chair: 26kmh (16.15 mph).
So the questions are:
1- Put I make a mistake with pitch?
2- What the pitch I have to put now (9 or 10 pitch)?
3- If I buy a 9 pitch I will broke my outboard ?
4- What speed I can dream with a 9 and 10 pitch with me and other person?
5- Putting pitch 9, I'll imagine that I will get speed loaded? Today I'm 13.75mph can imagine something near 18-19mph ?? Or will not be as great progress as well?6- They said these johnsons 15hp 88 has in reality no more than 13hp, so go unless other engines like yamaha 15, you confirm that?
or I need to put this motor is garbage and buy a tohatsu 18 ?
Best regards! From Brazil!