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Old 11-04-2021, 09:11 PM   #161
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Country: Scotland
Location: Isle of Lewis
Occupation: Skipper
Boat make: Thundercat
Engines: Yamaha 70ces

Join Date: Apr 2014
Location: Isle of Lewis
Posts: 506
Had some decent conditions today, a bit windier than I hoped but nice and cold. Did about 15 top speed runs, some 2up and then some with just myself and a 30kg water ballast. Performance is the best it's ever been, managed 78.1mph on one run! 67.8 knots, even faster than I went at Coniston. Still a couple things to try
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Old 18-04-2021, 08:10 AM   #162
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How are you, people? Did any speed runs recently?
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Old 18-04-2021, 05:53 PM   #163
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Country: Scotland
Location: Isle of Lewis
Occupation: Skipper
Boat make: Thundercat
Engines: Yamaha 70ces

Join Date: Apr 2014
Location: Isle of Lewis
Posts: 506
Not been out since then, doing a couple tweaks to the boat
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Old 21-04-2021, 12:36 PM   #164
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Cool, hope you show us some photos when you're done.
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Old 02-05-2021, 02:24 PM   #165
Thundercat guy
 
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Country: Scotland
Location: Isle of Lewis
Occupation: Skipper
Boat make: Thundercat
Engines: Yamaha 70ces

Join Date: Apr 2014
Location: Isle of Lewis
Posts: 506
Great week last week, was over in Skye for a few days and then made it to Easdale for Friday/Saturday. Covered 68nm on fri and 57nm on sat. Engine running pretty well although I think there’s water in the fuel, starting playing up a bit towards the end. Superb weather though!






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Old 03-05-2021, 12:40 PM   #166
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Cool!Looks like in the movies. It was a lot of fun for sure.
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Old 06-05-2021, 08:27 AM   #167
Thundercat guy
 
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Country: Scotland
Location: Isle of Lewis
Occupation: Skipper
Boat make: Thundercat
Engines: Yamaha 70ces

Join Date: Apr 2014
Location: Isle of Lewis
Posts: 506
A couple weeks ago my friend Rolf Magne Sunde passed away. I got in touch with him years ago about engines and tuning, and after Coniston I sent him my engine to tune. He was an absolute mechanical genius, lovely guy and we spent countless hours on the phone discussing all things Yamaha. He set a World Speed Record with one of these engines on an f4 catamaran at over 100mph in the early 90's which still stands today. We spoke every other day and he will be sorely missed.
I got this custom sticker made up a year ago to go on the new engine cowling which is now nearly ready to go on



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Old 13-05-2021, 07:57 AM   #168
Thundercat guy
 
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Country: Scotland
Location: Isle of Lewis
Occupation: Skipper
Boat make: Thundercat
Engines: Yamaha 70ces

Join Date: Apr 2014
Location: Isle of Lewis
Posts: 506
New cowling is now on, 3D printed an intake section in the back which is a lot bigger than the standard one too

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Old 16-05-2021, 07:24 PM   #169
Thundercat guy
 
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Country: Scotland
Location: Isle of Lewis
Occupation: Skipper
Boat make: Thundercat
Engines: Yamaha 70ces

Join Date: Apr 2014
Location: Isle of Lewis
Posts: 506
Anyone have any ideas on this? Engine is running strange, mid range has massive hesitations. If I can get it up to speed it sort of clears. Has been running like this for the last few runs now, filter is full of this stuff. I've changed the fuel, run it through a water seperater and it doesn't seem to be water. Cleaned the carbs, checked fuel pump
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Old 13-07-2021, 06:29 PM   #170
Thundercat guy
 
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Country: Scotland
Location: Isle of Lewis
Occupation: Skipper
Boat make: Thundercat
Engines: Yamaha 70ces

Join Date: Apr 2014
Location: Isle of Lewis
Posts: 506
Seem to have sorted the water in the fuel tank, removed some worn rubber seals from the tank and made a U shaped breather to stop water going in. Also had an issue with the engine dropping onto 2 cylinders, turned out to be a loose bolt on one of the pickup coils under the flywheel. Engine now going better than ever, jets are 170/180/180, not running the additive any more as the supply has dry. Using octane booster with Toluene instead, plugs are the perfect colour so happy with that.

Booked accomodation for Coniston again this year, hopefully goes ahead! Need to find a copilot whos 50kg or less, any volunteers?
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Old 06-09-2021, 09:58 PM   #171
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That's great news, everything sounds perfect. when will you be going to Coniston?
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Old 06-09-2021, 10:49 PM   #172
Thundercat guy
 
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Country: Scotland
Location: Isle of Lewis
Occupation: Skipper
Boat make: Thundercat
Engines: Yamaha 70ces

Join Date: Apr 2014
Location: Isle of Lewis
Posts: 506
Records week is the first week of November, 1st-5th this year
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Old 20-09-2021, 08:39 PM   #173
Thundercat guy
 
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Country: Scotland
Location: Isle of Lewis
Occupation: Skipper
Boat make: Thundercat
Engines: Yamaha 70ces

Join Date: Apr 2014
Location: Isle of Lewis
Posts: 506
Couple shots from the summer


and video https://streamable.com/ypxiue
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Old 02-10-2021, 11:18 AM   #174
Thundercat guy
 
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Country: Scotland
Location: Isle of Lewis
Occupation: Skipper
Boat make: Thundercat
Engines: Yamaha 70ces

Join Date: Apr 2014
Location: Isle of Lewis
Posts: 506
New stickers on for Coniston
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Old 07-10-2021, 07:26 PM   #175
Thundercat guy
 
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Country: Scotland
Location: Isle of Lewis
Occupation: Skipper
Boat make: Thundercat
Engines: Yamaha 70ces

Join Date: Apr 2014
Location: Isle of Lewis
Posts: 506
More testing done yesterday, early morning had a couple hours calm. Consistent 76mph + each run, tried the new cylinder head I designed which gave a bit more power. Well chuffed with that! 76.7mph top speed, couldn't get my biggest prop to settle so need to try a couple setup tweaks.
New car too, Subaru Legacy 3.0 Spec B Auto


T shirts designed for Coniston
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