This might be another of those threads debating where boat names came from.
One story I heard was that Petter's produced a batch of engines suitable for landing craft that subsequently were not needed, and were 'moved' and appropriated for use in Narrow boats to replace some Nationals etc. The PD2M that went onto YARMOUTH came from a ships lifeboat with little use, so the M is for 'Marine'. There were other variants made of the twin with different suffixes, some went into industrial uses for pumps and generators, some of the latter may well have been 'marinised' with cardan shafts, but not the M suffixed engine to my knowledge. Parson's 'F' box, with or without reduction, solid shaft with 'Metalastic' block was I believe the norm.
Petter made 3, and 4 cylinder, 'V'6's and 'V'8's. Speedwheel has some shots of a V8 in generator mode.
McLaren is an old firm established in 1876 by brothers John and Henry who produced steam traction engines. The McLaren connection was from involvement from that company from 1947 when working in conjunction with Fielding & Platt Ltd. and Petter's Ltd. producing a totally enclosed range of horizontal engines known as the Petter-Fielding (I believe such engines were used in the Fieldmaster [maybe thinking of Fieldmarshall] tractors, they certainly look the same.) In 1949 controlling interests in McLaren were acquired by the Brush group. In 1957 no less than 76% of sales went to export with hundreds of Petter-Fielding engines going to India, Indonesia, Pakistan and the Middle East. Also a large consignment of vertical M series engines were going to Scandinavia, Malaya, Brazil, South Africa and Australia. Furthermore, parts were being supplied still for engines which had been in service since 1928. In 1951 turnover was 12 times that of 1946. Over 1,900 men and women were employed in a vast complex covering 13 acres. The Planet type tractor was fitted with a Petter PD2 with Berger Handraulic starting equipment. One such vehicle was used to tow passengers and personal luggage around Butlin's Camp in Pwhllheli.
Much of the above information is taken from 'The Stationary Engine' magazine, December 1991 in an article written by David Edgington.
I was going to post an image, but Photobucket is not performing.
Here we go (trouble with Firefox)
One I pulled to bits earlier:
Derek
Not forgetting the little Petter PAZ1 (Pazi) which many will remember as powering the thousands of cement mixers on building sites. We had one powering a 24V generator on the bow of our Dutchman.