Winger Ed.
08-03-2004, 09:44 PM
Hooty and I got to the lake today with the more or less finished boat. He was going to bring his STV for a chase boat and get some pictures under power,,,,, but he tore up his jack plate the other day.
It ran well, there's lots of 'set up' and prop experimentation to do still.
With the 150 hp 2.4, a 1 to 1.87 gear case, 25p Merc. Tempest prop:
It turned up 5,200 rpm before it ran out of horsepower, giving a GPS speed of 59.7.
We raised the tilt about a inch. The water was getting 'less flat' by then. It had a series of 3-6 inch swells from many many boat wakes that you could really feel the boat getting hit by a big surge of resistance when crossing them.
I felt the engine could have wound up a little higher if the water was more flat. But, conditions what they were, it only got up to 5,000 rpm, but the GPS speed read 61.7mph.
I figure the slippage percentage went down as the engine's tilt angle came up.
///
The take off was great, no bow rise or cavitation to speak of.
Acceleration shoves ya straight back in the seat. Top speed
was reached in just a few hundred yards.
I couldn't ask it to have been more stable, very little sideways tilt in the turns. I had a little trouble with a battery connection, and was able to get out of the seat and walk down the side of the cowling to reach in the back and fiddle with them. The boat leaned over with my 250lbs doing that, but only a couple of inches.
At 60, the rear 4-6 inches of the sponsons were in the water, and there was no hint that it wanted to kite or nose up.
We'll start more serious work on the set-up in the next few days. I figure I'll raise the engine a inch first, and we'll try one of Hooty's 28" Choppers to see how it does.
I hope to get it to where it runs out of horsepower and tach.s out at around 6500rpm. It won't be raced, and the older I get, the less I like rebuilding engines.
I can't thank you folks enough for helping me along during the design and construction stages, and all the support as it came along.
Ed.
It ran well, there's lots of 'set up' and prop experimentation to do still.
With the 150 hp 2.4, a 1 to 1.87 gear case, 25p Merc. Tempest prop:
It turned up 5,200 rpm before it ran out of horsepower, giving a GPS speed of 59.7.
We raised the tilt about a inch. The water was getting 'less flat' by then. It had a series of 3-6 inch swells from many many boat wakes that you could really feel the boat getting hit by a big surge of resistance when crossing them.
I felt the engine could have wound up a little higher if the water was more flat. But, conditions what they were, it only got up to 5,000 rpm, but the GPS speed read 61.7mph.
I figure the slippage percentage went down as the engine's tilt angle came up.
///
The take off was great, no bow rise or cavitation to speak of.
Acceleration shoves ya straight back in the seat. Top speed
was reached in just a few hundred yards.
I couldn't ask it to have been more stable, very little sideways tilt in the turns. I had a little trouble with a battery connection, and was able to get out of the seat and walk down the side of the cowling to reach in the back and fiddle with them. The boat leaned over with my 250lbs doing that, but only a couple of inches.
At 60, the rear 4-6 inches of the sponsons were in the water, and there was no hint that it wanted to kite or nose up.
We'll start more serious work on the set-up in the next few days. I figure I'll raise the engine a inch first, and we'll try one of Hooty's 28" Choppers to see how it does.
I hope to get it to where it runs out of horsepower and tach.s out at around 6500rpm. It won't be raced, and the older I get, the less I like rebuilding engines.
I can't thank you folks enough for helping me along during the design and construction stages, and all the support as it came along.
Ed.