Prop Size Trouble
#1
Registered
Thread Starter
Join Date: Oct 2013
Location: Toledo, Ohio
Posts: 16
Likes: 0
Received 0 Likes
on
0 Posts
Prop Size Trouble
Does anyone know who I need to talk to about the right size prop for my boat. The boat is approx. 12000 lbs. 40' Scarab twin 550hp, TRS drives.. I can not get over 42-4300 rpm. Top speed is low. and fuel economy is poor. (not really caring about that),
I was hoping someone can lead me in the right direction. I just don't want to start buying props.
I was hoping someone can lead me in the right direction. I just don't want to start buying props.
#2
Platinum Member
Platinum Member
iTrader: (6)
Currently running ?? prop
#4
Charter Member # 55
Charter Member
Assuming the engines are running correctly, you're over propped. 550hp engines at what rpm??? At 4300 rpms, they are prob only making 400hp.
Every 1" drop in pitch equals about a 200 rpm gain at WOT.
Every 1" drop in pitch equals about a 200 rpm gain at WOT.
#6
Platinum Member
Platinum Member
Is that the 38 with a swimstep ? because that boat with TRS drives should run a 23 Bravo 1 3 blade. But if you have the generator and A/C it might drop down to a 21 3 blade
#7
Registered
Thread Starter
Join Date: Oct 2013
Location: Toledo, Ohio
Posts: 16
Likes: 0
Received 0 Likes
on
0 Posts
Scarab 400
It is the 400, Basically the 38' hull with the swim step as part of the hull , has the reverse arch. Does not have a generator. Motors run fine just trying to find out what size prop to go to since I feel what I have now is not correct.
#8
Registered
Join Date: Aug 2011
Location: Dunkirk ny
Posts: 440
Likes: 0
Received 0 Likes
on
0 Posts
Prop
Jj
#9
Registered
Join Date: Aug 2011
Location: Dunkirk ny
Posts: 440
Likes: 0
Received 0 Likes
on
0 Posts
Prop help
Does anyone know who I need to talk to about the right size prop for my boat. The boat is approx. 12000 lbs. 40' Scarab twin 550hp, TRS drives.. I can not get over 42-4300 rpm. Top speed is low. and fuel economy is poor. (not really caring about that),
I was hoping someone can lead me in the right direction. I just don't want to start buying props.
I was hoping someone can lead me in the right direction. I just don't want to start buying props.
Jj
#10
post #4, and the price is right. (thread is for 25's but post 4 has a pair of 23's)
http://www.offshoreonly.com/forums/w...5p-3blade.html
i might be wrong but, trs typical depth is like 7 1/4 inches and i think the bravo 1, 4 blade does not like to be that deep
http://www.offshoreonly.com/forums/w...5p-3blade.html
i might be wrong but, trs typical depth is like 7 1/4 inches and i think the bravo 1, 4 blade does not like to be that deep