how fast

lobbers

Senior member
Joined
Mar 3, 2005
Messages
137
Location
midlands
Cruising area
south coast when get chance
Boat name
yellow boat
Boat make
seaquel 600xs
Engines(s)
yamaha 200 pro v
can anyone shed some light on what sort of speed i may get out of my yam 200 prov with 21" prop please:)
 
If the sequel is a light boat a 21" may be alittle on the small side but i recon you should see at least around the 60mph
 
It depends on the gear ratio of the gearbox as well.
 
lobbers said:
can anyone shed some light on what sort of speed i may get out of my yam 200 prov with 21" prop please:)


Not fast enough cockwipe!!:bang: :drain: :lol:lol:
 
so what would be a better size prop to use:hugegrin:
 
and stiil you would be following:drain: :drain: :drain:
 
lobbers said:
so what would be a better size prop to use:hugegrin:

Whats your gear ratio?
what rpm is peak power on your engine?
how high you running? i.e where is your prop shaft in relation to the bottom of your transom?
 
not sure of any of that just brought engine cos looked good and prop is about 4ft away as not fitted it yet wanted to get as much info as poss before so to get it right when fitting it
 
if it the same sort of spec as a 200 merc with 1.87:1 gears and you are looking for top speed thus sacrificeing a little on pull out by mounting the engine high you may see the magic 70mph but you may find you need around a 23" prop to keep the revs down but best thing to do is find out where peak power is then run it with what you got and see what revs you get flat out then prop up or down accordingly.
 
ok thank i,ll have to see how she goes know where there is a 4 bladed phirana 24" prop:hugegrin:
 
now thats not being very sporting is it:frog: :jaw:
 
I think the Yam's are lower revving than Merc's, topping at summat like 5500
 
Running a Yam Pro V 200 on the back of a Ring 21E with a Yam 23" prop & getting just under 70mph @ 5800 rpm.

Have tried a couple of 4 bladers & gain on pull out but loose a couple of mph at the top end.

Not sure how the weights of the boat compare though.
 
i was running my yam 130 at 6400 no problem this year after cutting the rev limiting cable.
 
Isnt there a speed calc out there with boat weight ? It definitly has an impact on speed.
 
No because there are other factors involved such as hull design. The prop calculator will give you a maximum possible speed or if you know that the amount of slip but that's all.
 
FrenchPhil said:
Isnt there a speed calc out there with boat weight ? It definitly has an impact on speed.

Correction is made under the slip of the prop,
identical set ups but with differing weights will have differing slip percentages.

There are a lot of questions on props must post my excel spredsheet. er Damm!! must make it a zip first !!
 

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