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Old 22 September 2015, 06:01   #11
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Originally Posted by Bombardc2 View Post
That's the one! I used the launch there all the time when we had inflatables but haven't been for a while. I do plan to launch there more often again. I'll say hello next time I see you! We were beside you at one point and think you were touching nearly 20 knots 🚤! If you want to venture a bit further at some point but want a bit of back up drop me a pm.


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20knots sounds fine to me! I'll PM you as we were toying with a trip over the bar and beyond.

Simon
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Old 22 September 2015, 06:14   #12
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>>>think you were touching nearly 20 knots

Is that with a Mariner 15? If so you are getting every bit of performance out of that setup... and no loss of speed for the 420 over the 380. Excellent.
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Old 22 September 2015, 07:12   #13
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>>>think you were touching nearly 20 knots

Is that with a Mariner 15? If so you are getting every bit of performance out of that setup... and no loss of speed for the 420 over the 380. Excellent.
Yes, using a 2006 mariner 15 longshaft. With freshly changed gearbox oil

Simon
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Old 22 September 2015, 07:55   #14
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If that is GPS verified I'm very jealous.

Anyone comment on why mine is slower?!

Bombard Aerotec ready for the maiden voyage (b@stard son of a Y Class)
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Old 22 September 2015, 08:08   #15
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I can't think you have anything wrong Max but the advice we'd both give a newbie...

Aerotec:

Inflated to pressure and rechecked in the water?

No weed growth - ha ha.

Load not excessive?


Mercury:

Reaching WOT?

Compression check?

Carb clean?

Prop perfect?

Prop pitch?

Transom height/trim angle setup?
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Old 22 September 2015, 08:12   #16
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If my memory is right 18 knot is about right for a 15hp on a 380 Aerotec.
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Old 22 September 2015, 08:26   #17
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That's what I thought Nick but this has always been Fibnet hence I'd like to see gps verified speeds only! It all depends on load too of course so people need to post their load weights. To summarise in say F3 chop I get around 16.5 to 17 tops, maybe it might say max (for a second 17.2). Load around 160kgs.

Check all that David bar as noted that my Tiny Tach broke so need to get another to check revs at WOT. Don't have a compression tester though...
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Old 22 September 2015, 08:30   #18
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Hmmm, just found a post from a while back (!)

380/15HP Prop suggestions

Quote:
Originally Posted by Max... View Post
Nasher - finally got round to doing some runs with the tacho on today.

Mariner 15 with standard factory prop.

Best trim position was 2 and achieved 5750 rpm max at WOT. Touched 19 kts lightly loaded with myself 12 stone and young son around 5 stone.
I've lost a bit off the top!

Another topic on this here:

Y Class avon best prop?
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Old 22 September 2015, 08:32   #19
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That's what I thought Nick but this has always been Fibnet hence I'd like to see gps verified speeds only! It all depends on load too of course so people need to post their load weights. To summarise in say F3 chop I get around 16.5 to 17 tops, maybe it might say max (for a second 17.2). Load around 160kgs.

Check all that David bar as noted that my Tiny Tach broke so need to get another to check revs at WOT. Don't have a compression tester though...
I had planned on taking a GPS with me but left it in the car... Next time I'm out I'll do a proper speed check. But for now, I'm claiming 20
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Old 27 September 2015, 16:40   #20
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Just remember to always do a speed check over two legs on reciprocal bearings - tide / wind / waves can easily shift your top speed by +/- 2 knots or more.

Cheers

Chris
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