Thread: The Ultimate FC

Learning about the Rolls Royce B81 motor.
It was designed and tested in WW11.
Designed for the miltiary only, but rolls tried commerical sales later (diesel sales killed that idea)
The best materials and design was used for the time.
The designed life is 300,000 miles before overhaul.
It is a very under stressed motor for long life.
What appears to have killed these motors in real life is a lack of use in militiary and civie hands.
(Internal rust and and the rings lossing tension.)
They are dry seleeve cylinders, with screw in harden valve seat incerts etc.
Very well made.
For some reason the poms in the design of the motor went from overhead valve to F head....side exhaust as they though it was easier to controll exhaust valve temps.
I know side valves can limit compression and horse power by its design.
The good news is Rolls knocked out civie versions with much higher out puts than the militiary versions....220 to 240 hp with about 340 ft lbs
The civie versions went to 300 hp and these pics of a 1951 Bentley with a RR B81 puts out 400hp and 400 ft lbs
There is hope for the old stolly yet........four SUs seems a simple mod to do.

Gday ron

The 4 su carbs looks like a good idea. just watched the video of the stollie going down that hill,you think the guy would have straightened it up a bit first,i bet he had to change his pants when the back started lifting.

Gaz

More poo on the drivers seat with this one.
It looks like the whole rear end picked up and the Stolly skidded down on the front bow plate and thats why the driver couldnt steer it.
Nice to know the bow plate may stop it going right over.
A brave thing to do........look at the height above ground the driver was before he put the nose over.( the driver most likely wouldnt see where the vehicle was going until things started to go wrong.)
[ame=http://www.youtube.com/watch?v=5-r_s7wTvW4&feature=related]YouTube - amfibie[/ame]

May be if the driver kept off the brakes, the front wouldnt have not dug in and the steering may have worked better.

I am starting to get into this amphibious thing a bit.
I have decided the ultimate FC is a OT-64 APC made by TATRA( not the Stolly) based on the TATRA 813/815 truck range.
Three things are interesting about this vid.

It high lights the hassles of getting a wheeled ampibious vehicle out of the water( thats why most have winches).

Russian Ampibious gear is very good.

Tracked ampibious vehicles have good all round performance with less mechanical problems and openings in the hull.

Things can turn to poo in very short order.
The LuAZ 4x4 is a small vehicle with central driving position and is propelled in the water by its wheels only( I have seen one swim at Corowa)
CHECK OUT from 5.50 onwards.

[ame=http://www.youtube.com/watch?v=40_yCEL-eFA]YouTube - Plavby OT-64.mpg[/ame]

Thanks Ron, yes keep posting as long as it doesn't impinge too much on your time. It's a great looking beast. Good luck with it all.
Don.

I vaguely recall reading that the Stolly was able to be fitted with small rockets to assist in exiting the water. I believe these are available cheaply from the US equivelant of Aussie Disposals.
Wagoo.

My Stolly taken from a mates phone camera.
Its first run on Aussie roads.
[ame="http://s131.photobucket.com/albums/p299/101Ron/?action=view&current=IMG_0087.mp4"]IMG_0087.mp4 video by 101Ron - Photobucket@@AMEPARAM@@http://vid131.photobucket.com/player.swf?file=http://vid131.photobucket.com/albums/p299/101Ron/IMG_0087.mp4@@AMEPARAM@@vid131@@AMEPARAM@@131@@AME PARAM@@p299/101Ron/IMG_0087@@AMEPARAM@@mp4[/ame]
[ame="http://s131.photobucket.com/albums/p299/101Ron/?action=view&current=IMG_0083.mp4"]IMG_0083.mp4 video by 101Ron - Photobucket@@AMEPARAM@@http://vid131.photobucket.com/player.swf?file=http://vid131.photobucket.com/albums/p299/101Ron/IMG_0083.mp4@@AMEPARAM@@vid131@@AMEPARAM@@131@@AME PARAM@@p299/101Ron/IMG_0083@@AMEPARAM@@mp4[/ame]

Originally Posted by wagoo

I vaguely recall reading that the Stolly was able to be fitted with small rockets to assist in exiting the water. I believe these are available cheaply from the US equivelant of Aussie Disposals.
Wagoo.

Just try to get some JATO rockets through Customs!

Diana