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2017 Super Light Tunnel World Record 71 mph Motor!
http://ww.w.hpbc.ca/viewtopic.php?f=52&t=4719		 Page 1 of 1
Author:  Hounddog [ January 31st, 2025, 2:45 pm ]
Post subject:  2017 Super Light Tunnel World Record 71 mph Motor!
Ok, the T750 record is 66 mph.....50 tohatsu...that’s impressive considering the previous record was mid 50 mph.
Now we have a SLT record at 71 mph.....another 50 tohatsu...now this is even more impressive!
https://www.youtube.com/watch?v=voggn_c4V3A
Author:  Hounddog [ January 31st, 2025, 3:10 pm ]
Post subject:  Re: 2017 Super Light Tunnel World Record 71 mph Motor!
I have a pretty good history with the 50 tohatsu going back to 1992. I am puzzled how they are getting these type performances out of that motor.
71 mph at 7300 rpm means at least a 22 pitch prop. The 66 mph T750 was set with a Yamaha 70CES 11 X 22. I have tested one of those props. My 50D T750 runs a 11 x 18 at 7000 rpm and 57-58 mph. That’s faster than the previous World Record .
A 50D is the best performing. They are better than the later series. I have that model and later models
I have had and raced several and never had one being capable of turning a 22 pitch at 7300 rpm.
T750 is a stock class with specifications for the motor.
I haven’t been able to find out nor have others been able to find what is special with these tohatsu motors.

Anyone know???
Author:  Roflhat [ February 2nd, 2025, 12:43 am ]
Post subject:  Re: 2017 Super Light Tunnel World Record 71 mph Motor!
There's lots of trick bits you can do with the flow in the Tohatsus, but the SLT generally take less to push them along than the T boats. But the Tohatsu that got that record at Coniston is pretty hopeless lower down in the rev range, basically built as a record motor
Author:  Hounddog [ February 2nd, 2025, 10:24 am ]
Post subject:  Re: 2017 Super Light Tunnel World Record 71 mph Motor!
99% of the people who view this site wouldn’t give a damn one way or the other about these insignificant World Records for small race classes. I believe the inspectors at these events don’t care very much either and inspection is minimal if any.

As a one per-center let me explain why it’s upsetting to me.
I raced in OPC classes that are stock classes with set rules and engine specifications. You were disqualified if your equipment didn’t pass. You never wanted to be disqualified because that would be an embarrassment to you and you would always be suspected of cheating from that day on.

How many on this site have had there equipment inspected at a race? What about at a National Event Race? What about a World Championship?
Well I can said yes to all three!

Good inspection is first fault and you’re disqualified. Inspectors check easiest part first.
My inspection at the World Championship in 2008 was 3 inspectors and took 2 hours. Each inspector individually examined every part of the motor that had a specific measurement for it.
I got my motor back in pieces.
It is much more difficult to win in a stock class!

Records that don’t make sense in stock classes shouldn’t go unchallenged. Records are goals racers try to match. They are a yardstick stick and indicate were you need to be to be competitive.
Author:  Roflhat [ February 3rd, 2025, 4:10 pm ]
Post subject:  Re: 2017 Super Light Tunnel World Record 71 mph Motor!
Agreed, and it is the same process over here especially at records week. Whole engine strip down and it's up to the competitor to put it back together.
The modified SLT classes are not quite open but you can do a huge amount of work to the engines, so a lot of it is about who has the deepest pockets or the most ingenuity.

The classes with the 70ces are a lot more limited with what you can do, but within those regs people did find a lot of improvement. The Norwegians and Finns especially
Author:  Hounddog [ February 3rd, 2025, 7:25 pm ]
Post subject:  Re: 2017 Super Light Tunnel World Record 71 mph Motor!
The T750 record.
Before there was any engine inspection. Over in North America they would question...the boat.
Is it a production T750? They would want to know the make and model of the boat and was that model ever raced in T750. If it’s a new model how many are there in existence? The answer would have to be correct or the post inspection ends right then ...the boat is illegal.
I have never seen another T750 hull like that one before. It appears to be a smaller GT30 or perhaps a T550 hull with an extended strong box to make the boat the correct T750 length.
Those hulls are registered to race in those classes not T750.
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