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05-13-2020, 03:34 PM #106
Cant wait to see a video of it running!
LETS GO BRANDON.... LETS GO BRANDON
Sometimes I talk to myself...then we both just laugh and laugh
'84 Checkmate Convincor
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05-13-2020, 04:45 PM #1075000 RPM
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05-15-2020, 06:45 AM #1085000 RPM
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That boat came out great. You and your shop class should be very proud.
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Instigator, Seanj85 thanked for this post
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05-20-2020, 12:40 PM #109
Looks good! Makes me want to build one when I finish the current project. Can't wait to see it setting the water on fire!
'78 Hydrostream Viking/'98 225 ProMax
Restoration: https://www.screamandfly.com/showthr...Viking-rebuild
Pictures: https://www.flickr.com/photos/152974...57708863869223
Videos: https://www.youtube.com/tnels
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Seanj85 thanked for this postInstigator, Seanj85 liked this post
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05-20-2020, 09:59 PM #110Screaming And Flying!
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A side note.... the steering arm ends MUST intersect with the C/L of the swivel point...… If not loose or tight steering cables.....when turning the wheel.
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Seanj85 thanked for this postInstigator liked this post
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05-21-2020, 04:09 PM #1115000 RPM
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05-21-2020, 04:17 PM #1125000 RPM
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I tried to steal a go pro from work but they wouldnt let me in.
Took er out for a cruise monday, hit 55 on the first run. Sponsons were still in the water. Went back to the ramp and pulled the motor up another half inch and added a little trim. Hit 63 on second run, but I was too scared to look over at the sponsons while laying down. I am pretty sure they were out of the water. I could feel the lift and it was riding more... quietly...
Also I thought the lower was at a 1.6:1 ratio however i messed up. It is more like 2:1.
That means 63mph is about 6500 on a 23pitch prop going thru a 2:1 reducer w 10 percent slip.
Spoke to the guys at ron hill, I have a feeling I am over-reving the engine, they are sending out a 26pitch. Going to give it a shot just have to pay shipping for the swap.
Also let a student take it out, I made sure the trim was back to original setting. His father docks his boat 2 slips down from me so we made a socially distant morning out of it. He had a blast.
I never thought 63 would feel so fast. It feels like you're going 100 mph. Gary I see what you mean about controlling lift w your body location. I am not sure how much faster I want to run. This thing rips.
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05-21-2020, 04:19 PM #1135000 RPM
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tnelsmn liked this post
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05-22-2020, 08:29 AM #114
Love it!
I think somewhere in this thread I guessed you’d see 70 and based on results I’d say w/the proper wheel, you’re there.
Excellent of Ron Hill to help you like that.
Dont be afraid of the hull lifting.
Youll feel it when it starts.
On your next outing:
Make sure there's no wind, and water is calm.
That should probably start carrying the sponsons at around 55 if weight balance is close.
W/you up by the wheel, get it to a steady 50/55.
Then start walking yourself aft, one step at a time.
Pay attention to feel. You’ll also see the bow raise and your angle of attack change.
Once you get it to lift, still keeping speed steady, move fore and aft small amounts and watch for changes in attitude.
You will start to feel it and sense it.
And you’ll like it ��
It will transition from being/running like a boat to, a low flying plane.
Once you’re comfortable w/this sensation, at that speed, feed it some more throttle.
Your goal will be to keep angle of attack stable as speed and aerodynamic lift increases.
Youll do this by walking back towards the wheel.
In an oval course race, drivers jump as far back in the boat as they can when exiting the turns ( I used to have bruises on my ass from the motor clamp handles!) to get the bow up and packing air as early as possible.
As that’s happening they’re also walking up the floor board to keep the bow where they want it.
In theory, your having the hull carry its weight and your weight on a cushion of air.
Only the last 2” of the main bottom is in the water.
Near zero hydrodynamic drag.
Ive been waiting to see if you’d make it to this step or stop when you get to 55 like most do.
Well done grass hopper.
Here is a shot w/me in the close boat.
Notice sponsons of both boats.
Now, also notice driver position, both boats.
You can tell far driver is farther forward than me.
Either, he was lighter or his hull had more lift causing him to walk closer to wheel.
This is at wide open throttle, end of straightaway, at top speed.
We were both flying our boats where we thought they were fastest/most efficient.
Didnt matter, i was passing him and beat him anyhow.
Last edited by Instigator; 05-22-2020 at 08:38 AM.
I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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05-22-2020, 11:08 AM #1155000 RPM
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Great info thank you Gary. Once this prop arrives I will take that information into consideration for next time. I am noticing that little changes in trim make a big difference. Did you run with any trim? Or tuck? Trying to find my sweet spot.
Hopefully i have a gopro by then. Driving this thing is so much fun, I also noticed it gets a lot of attention.
What year was the picture from? Are you running a yamato? How fast are you going in that pic?
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Instigator liked this post
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05-22-2020, 03:53 PM #116
I think Sean's been bitten.
RockTeam Junk
No sparkling wiggles in here, only dump truck grinches.
"Screamin Heathen"
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05-22-2020, 05:57 PM #117
The lift in the hull, weight, power, prop, conditions determine set up.
That hull liked neutral or a bit of down trim.
About ‘1980 in Laredo Texas.
Yes, Yamato 80 just after they came to the states.
High 60’s.
Was a fun race.
Local news had a helicopter there filming my race.
When I got out front they were filming me from just ahead, just above.
I remember I had these cool white leather driving gloves and was showing off for them.
Was working and racing for the builder of that boat.
That boat was very fast and very stable but I was hot dogging for the news chopper.
I made it look out of control for the camera.
Should have been killer footage but I never saw it.
After the race my boss asked me what was wrong w/the boat ��
The next day, while leading my heat, at the end of the race, I hit something in the water and blew a hole in the bottom of the boat.
It was bad and I was filling w/water fast.
Rules say you cant pit until last boat finishes.
I was 1/2 a lap ahead of second place boat and almost a full lap ahead of last place. So I had a while to wait.
The boat had so much water/weight in it, even w/the motor still wide open, it came off plane.
I did circles in front of my pits throwing water in the air so my boss would know what was going on.
He kept waving me off knowing I’d get DQd if I came in.
They had turn judges on a pontoon in middle of the course and I did laps around them doing same thing and they also motioned for me to stay out.
Last boat finally finished and I let off the throttle and the boat sank right in front of our pits!!
Funniest part was being that Laredo is right on the Texas border with Mexico there were a lot of Mexican spectators at the race. There was a group of four or five of them in lawn chairs Right by our pits and watching my race.
When they saw me win the race and then the boat sank in front of them they went freaking berserk!
It was hilarious. Couldn’t speak a lick of English but you could tell they were having a blast.
Was a fun race.
Last edited by Instigator; 05-24-2020 at 07:27 AM.
I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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05-23-2020, 07:39 PM #1185000 RPM
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Awesome stuff
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Instigator thanked for this post
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05-28-2020, 05:32 PM #119
yeah lives around the corner from me
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06-10-2020, 06:33 AM #1205000 RPM
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Here is a link of her running. Still working on setup, I need to get rid of this battery and even though the plans dont call for it, Ron Hill suggested adding air traps. Also going to try another prop, just waiting on them to finish building it.
https://youtu.be/C3a5m93Jqn4
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