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Old 10-06-2013, 09:19 PM   #21
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Boat name: On The Rocks
Boat make: Ring 21 marshan 17 four winns horizon, hydro 3 pointer, f2 cat, backdraft 22
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Quote:
Originally Posted by PJC View Post
Cool powerplant, we are currently fitting a pair or T53's (1850hp each) into a 50' cat to race in America in the SBI series, should be on the water in tow or three weeks
50' Mystic??

gaZ
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Old 16-06-2014, 11:39 PM   #22
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Country: UK
Location: Isle of Wight
Occupation: Helicopters
Boat name: Allison250
Boat make: Sunseeker Monterey 27
Engines: 400HP Gasturbine
Cruising area: Cowes

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Allison 250 Gas Turbine service

Just hauled it out for some barnacle cleaning! at Cowes Dry Sailing, many thanks to Tristan and Steve for their help, got the boat back in the water, but new prop test failed due to a bit of fuel starvation, the offending pump removed and new one will be here soon, 9.9 hp aux merc getting me out of trouble and giving 6knots flat out, so well happy.........
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Old 08-07-2014, 09:29 PM   #23
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Location: Newport Isle of Wight
Cruising area: solent

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Quote:
Originally Posted by Gasturbine59 View Post
Just hauled it out for some barnacle cleaning! at Cowes Dry Sailing, many thanks to Tristan and Steve for their help, got the boat back in the water, but new prop test failed due to a bit of fuel starvation, the offending pump removed and new one will be here soon, 9.9 hp aux merc getting me out of trouble and giving 6knots flat out, so well happy.........
Happy to help. Would have liked to look over the boat a bit more. Next time. Or if you pass after getting the fuel pump sorted and you need a sea trial helper. Give me a shout.
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Old 09-01-2016, 03:30 PM   #24
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Country: UK
Location: Isle of Wight
Occupation: Helicopters
Boat name: Allison250
Boat make: Sunseeker Monterey 27
Engines: 400HP Gasturbine
Cruising area: Cowes

Join Date: Sep 2012
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OK, moment of madness, I put the whole gas turbine Monterey project on ebay for 10grand !!, it didn't sell, now I have come to my senses and am about to transplant the Allison into waiting Fletcher 17GTS, just craning out the Merc 3.0litre to make some room LOL..............will show you some pictures later, this is a hot rod.....70mph easy!
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Old 09-01-2016, 06:07 PM   #25
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I considered an RR Allison for my Cougar 27 before I started building it. The reasons we opted out were two fold.

The first is that I didn't know how quickly the governor would react to the boat leaving the water at full power and instantly unloading the prop. I suspected that it would not react quick enough and the power turbine would over speed catastrophically as they were not designed for such applications. Around 15 years ago NTC in Canada built one using an Allison hooked up to a Hamilton jet drive but they only ever appeared to run it on flat lakes.

Squirt 1

The second was that the Allison is renowned for its reliability in its original application, however it is one of the less industrial and more fragile engines and we were concerned about corrosion in constant salt water environment of a boat. Especially on the compressor first stage as the blades and stator's are very thin.

Any thoughts on the above.
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Old 09-01-2016, 08:44 PM   #26
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Occupation: Motorsport Development inc Engine Managment
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Cruising area: Solent / Kent / Cornwall

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Quote:
Originally Posted by Gasturbine59 View Post
OK, moment of madness, I put the whole gas turbine Monterey project on ebay for 10grand !!, it didn't sell, now I have come to my senses and am about to transplant the Allison into waiting Fletcher 17GTS, just craning out the Merc 3.0litre to make some room LOL..............will show you some pictures later, this is a hot rod.....70mph easy!
That I want to see.. I get just under 65mph from a 17ft fletcher with a 220 outboard, and its not setup for speed.

Please update with your progress, sounds right up my street!
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Old 12-01-2016, 06:15 PM   #27
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Country: UK
Location: Isle of Wight
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Boat name: Allison250
Boat make: Sunseeker Monterey 27
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Cruising area: Cowes

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Allison issues

Quote:
Originally Posted by freddy21 View Post
I considered an RR Allison for my Cougar 27 before I started building it. The reasons we opted out were two fold.

The first is that I didn't know how quickly the governor would react to the boat leaving the water at full power and instantly unloading the prop. I suspected that it would not react quick enough and the power turbine would over speed catastrophically as they were not designed for such applications. Around 15 years ago NTC in Canada built one using an Allison hooked up to a Hamilton jet drive but they only ever appeared to run it on flat lakes.

Squirt 1

The second was that the Allison is renowned for its reliability in its original application, however it is one of the less industrial and more fragile engines and we were concerned about corrosion in constant salt water environment of a boat. Especially on the compressor first stage as the blades and stator's are very thin.

Any thoughts on the above.
Hi, yes as you say if prop comes out at full chat it would almost certainly overspeed, you need to modulate the throttle, they don't just go bang if you momentarily overspeed, there is a good amount of tolerance. Interesting thought though, as a trained helicopter pilot, one could be cruising along at full chat, then drop the lever on the floor to enter autorotation (airflow reversall through the main rotor) !, this has the effect of instantly removing the load, on some helicopters this is correlated with the power turbine governor, as in the case of the pneumatic governor on the Allison250, but for instance on the Gazelle helicopter, the astazou copes with no overspeed, and no correlation with the pitch lever, but it does use a hydraulic governor.
The corrosion issue is of concern, but again ,proper maintenance wash it with fresh water, the compressor is all stainless steel, so tougher than you think, I have had this Allison in the current boat now on a mooring and it hasn't shown any signs of deterioration. Once installed in the Fletcher it will be kept on a trailer, so i can keep it all dry and polished lol!.
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Old 12-01-2016, 06:34 PM   #28
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Country: UK
Location: Isle of Wight
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Allison transplant

Quote:
Originally Posted by beyondhelp View Post
That I want to see.. I get just under 65mph from a 17ft fletcher with a 220 outboard, and its not setup for speed.

Please update with your progress, sounds right up my street!
Thanks for you interest and words of encouragement!, I look forward to my progress!!, lol, will posts pics soon as , rgds
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Old 13-01-2016, 10:32 PM   #29
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Country: UK
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Boat name: Allison250
Boat make: Sunseeker Monterey 27
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Cruising area: Cowes

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Allison transplant

OK today the Merc 3litre came out, no probs so far!


check this Batboat out on ebay, awesome!!!
Allison Jet Turbine Powered Talon 21 Pickle Fork Powerboat Allison Jet Turbine Powered Talon 21 Pickle Fork Powerboat | eBay
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Old 06-03-2017, 08:30 PM   #30
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Boat make: Sunseeker Monterey 27
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Gas Turbine RIB

Quote:
Originally Posted by Gasturbine59 View Post
OK today the Merc 3litre came out, no probs so far!


check this Batboat out on ebay, awesome!!!
Allison Jet Turbine Powered Talon 21 Pickle Fork Powerboat Allison Jet Turbine Powered Talon 21 Pickle Fork Powerboat | eBay

OK , didn't bother with the Fletcher!, but now got a 5.4metre RIb!, much more fun?, been posting progress on Ribnet,
Gas turbine RIB? - Page 3 - RIBnet Forums
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Old 17-06-2017, 10:13 PM   #31
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Jet Rib! Progress?

Told ya!, nearly done!
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