etec 90 on avon 5.4 prop

[reinier]

A Stiletto has to be driven a few inches higher than you are doing. If you drive it too low you get much less RPM and more chinewalk. 1" could make 300 rpm more....

[mcinfantry]

Originally Posted by reinier

A Stiletto has to be driven a few inches higher than you are doing. If you drive it too low you get much less RPM and more chinewalk. 1" could make 300 rpm more....

it ventilates ALOT. i only have to trim a little to get on plane.... if i ran it any higher, i dont think it would need trim at all.

[reinier]

Originally Posted by mcinfantry

it ventilates ALOT. i only have to trim a little to get on plane.... if i ran it any higher, i dont think it would need trim at all.

Mmmm strange, I know someone who drives that prop with the anti-caviation plate 4" above the keel...

In that case a SS prop with less cup is better yeah.

[mcinfantry]

lowered the motor so its now ONE hole up.

had the prop changed from 17~19 to 16~17

5000 to 5100 rpm. raised ONE hole. 40mph and 4mpg! @ WOT!!! thats LOADED with 26 gallon fuel, fishing poles, ice chests, anchors, storage locker, t-top and 2 up......

[yellowmitch]

What do we reckon the ideal situation for prop / adjustment is then?

I am running the same setup and hitting around 45mph with 2 up, full load of fuel at 4600rpm on standard prop.

Burning 4gal/hr at 3500rpm

[mcinfantry]

Originally Posted by yellowmitch

What do we reckon the ideal situation for prop / adjustment is then?

I am running the same setup and hitting around 45mph with 2 up, full load of fuel at 4600rpm on standard prop.

Burning 4gal/hr at 3500rpm

i dont think 4600rpm is that good, i have been told you should hit 5000~5200.

[ian parkes]

Originally Posted by yellowmitch

What do we reckon the ideal situation for prop / adjustment is then?

I am running the same setup and hitting around 45mph with 2 up, full load of fuel at 4600rpm on standard prop.

Burning 4gal/hr at 3500rpm

Thats about the same as i was getting with the standard 17" prop and engine was labouring a bit a slow cruising speed . i fitted a turningpoint stainless 15" pitch and the revs went up to about 5200 , top speed didn't improve but holeshot and midrange was much better and the fuel consumption improved a lot , probably 25% better

[Bigmuz7]

Originally Posted by yellowmitch

Burning 4gal/hr at 3500rpm

something not right there,.. I know mine is a four stroke but its only using 10litres / hour on a 5.7 Hull at higher revs

[ian parkes]

I have never worked out what mine uses in an hour , just roughly how many miles i have done and what it takes to fill up . My comment meant I was getting the same prop performance .

10 litres an hour sounds very frugal but I guess for an average day out we probably are actually motoring for about 3 hrs and I usually use about 30 litres of fuel but 3 hrs at say 25knots is about 75 miles and i reckon mine does about 1/2litre a mile so not far off then