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| Fantail Launch Updated - Volume 2 |
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narrabay2
Senior Member
Username: narrabay2
Post Number: 174
Registered: 10-2019
| | Posted on Friday, May 21, 2021 - 03:38 pm: | 
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Continuing project updates from here:
http://www.oldmarineengine.com/discus/messages/4/422866.html
Started working on a little instrument panel that actually hides the electric wires etc, and can accomodate the steam gauge tachometer...
The bottom row is throttle, ignition/start key, choke. The other two rows are for running lights, bilge pump, deck lights, anchor light, and couple extras for whatever else later. 
Going out to get some stain, probably mahogany or similar color.
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narrabay2
Senior Member
Username: narrabay2
Post Number: 178
Registered: 10-2019
| | Posted on Friday, May 28, 2021 - 07:50 pm: |
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Might just work... just have to waterproof the tach really good...
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narrabay2
Senior Member
Username: narrabay2
Post Number: 180
Registered: 10-2019
| | Posted on Sunday, June 06, 2021 - 01:07 pm: |
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Well I have been sicker than in years with a cold, first day out of bed since Tuesday! Decided to do some light duty, and make the back cover for the little instrument and switch panel. Marine plywood I had sitting around. Just barely clears the tallest switch. Someone on here who's been very helpful to me suggested learning 3d CAD software and drawing things before making them, and he is of course correct and I need to do that. But this one just squeaked by...
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narrabay2
Senior Member
Username: narrabay2
Post Number: 196
Registered: 10-2019
| | Posted on Thursday, August 05, 2021 - 05:54 pm: |
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After all kinds of trouble with the engine tune, not fully resolved but better, we took it out for first ride since the YT-1 installation. 1.25 Miles each way through the harbor, although it seemed much longer. Idling it is turning 250RPM, cruising RPM was 550-650+ RPM.
Installed a 13x13 3-blade prop and I could bury the tachometer with that, which is over 700 RPM. The YT-1 red line is 800 RPM
It was very fun, went across the harbor, had dinner at a waterfront venue which was quite good, drove back in the dark. It ran great on the way over, but stalled several times on the way back but leaning the hi speed jet solved that. Wouldn't idle again at the very end coming to the ramp, but that's relatively minor. At least we didn't need the oars!
This boat is quite popular with other boaters! Lots of waves and smiles!
I was with Ernie this morning and he gave me some more ideas to work on the issue.
The crankcase breather is operating nice and dry (and the engine oil level if anything is even a little high). The cub cadet electric starter is a blessing. And the tachometer is very beneficial.
So for a first ride with the YT, despite some balky running at night (in pitch black!), I think was a success... and the night was calm and warm. Very nice weather for the maiden voyage...
Here's the video, slow running at first then cruising speed and some night footage coming back.
https://youtu.be/kg5z4oatP78
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narrabay2
Senior Member
Username: narrabay2
Post Number: 197
Registered: 10-2019
| | Posted on Friday, August 13, 2021 - 10:53 am: |
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Here's a little prop RPM vs MPH chart I made. Will have to do some GPS speed trials to compare boat speed to prop wash speed, or should that be "GPS slowness trials"!
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chris_spring
Senior Member
Username: chris_spring
Post Number: 136
Registered: 02-2019
| | Posted on Friday, August 13, 2021 - 12:25 pm: |
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It is good to see it under way. It seems it has been a rather long haul.
Others have advised that these boats are never really finished. There is always more to do.
Someone else advised that you invest more in an old boat than money.
Both statements are true. And that's the really cool part about it.
Cheers! |
ernie
Senior Member
Username: ernie
Post Number: 2648
Registered: 01-2002
| | Posted on Friday, August 13, 2021 - 12:36 pm: |
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Here is a neat hull speed calculator
https://www.easycalculation.com/physics/classical-physics/hull-speed-calculator. php
At rest your boat has a water line length of 18 ft. However the harder you drive it and then consider the squat of the fantail hull the water line length increases to 20.
So using this calculator your boat will have the following for top speed.
At 18 ft 5.6851 K 6.5425 MPH
At 20 ft 5.9927 K 6.8964 MPH
By the way these speeds are almost exactly what I found using a real GPS (not my phone)with the Gray 3 HP in it.
Also if you do the math yourself (1.5 times the square root of the water line length)the numbers are pretty much what the calculator in the link above gives.
Have fun with it
Ernie |
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