Boll- Major 4.4cc Diesel

I have recently completed another of Chris Bolls diesel engine designs, this time the Boll- Major 4.4cc (Not quite 5cc Tug!) Chris designs engines to be made from bar stock and with the minimum of frills to encourage modelers with the minimum of equipment to try their hand at making an I/C engine. Such a design therefore gives you the opportunity to alter things as you wish. I have done just that and only used the original Bore,Stroke and timing. Everything else has been modified in some way to suit my way of working. Chris has seen my modifications and approves of them.

.I had no difficulty in getting it to fire up. To date it has had 6 x 3 minute runs at a rich setting and is turning over at around 6400 RPM with an 11"x4" Master nylon prop.. It is still a little tight so the revs will improve to the around 8000 rpm that Chris gets with his version. I have several different propellors to try out.

Once again I have failed to get my photos inserted in the correct order. I have clicked on them as I intended them to be, but they seem to always go in the reverse.

Keith.

Edited By KEITH BEAUMONT on 01/05/2021 17:39:53

Looks good Keith, what diameter material did you need for the cylinder as it looks like a lot of swarf was made.
Need a video though just to hear it !!!!!

Emgee

Emgee,, It started out at 1.5" diameter, and did make a lot of swarf. With my record with inserting photos,any vid will probably run backwards!

Keith

Where can Chris Boll be contacted for drawings?

Niels

Niels, I will contact him for permission to send you his e mail address, by message.

Keith

Very,very nice.

Thank You in advance

Hi Niels,

I have put a message in your box.

Keith

Keith,

Another cracker.  I love the anodising 

Rod

Edited By Roderick Jenkins on 01/05/2021 20:56:17

Rod,

Thanks for your comments and I hope you have overcome your copywright problem.! I hope Neil notices I have gone "Green"

Keith

Superb result Keith, another beauty to the collection (and besides at .6cc adrift who cares )

The green ano is exceptional - whose dye did you use?

As my old boss would say on a job well done - "Ex - a - lent - tayy"

(haven't been doing much lately - the old Control Line bug has struck again )

Regards - Tug

Tug,

Thanks Tug, I am very pleased with the green too.I could not make my mind up whether green would look OK, I then thought of using a green felt pen to see the effect and that convinced me. I do not do the anodising myself. I have a local firm who is happy to do my bits.

Keith.

Lucky you Keith, no wonder it has that 'professional' look about it

Anodising is not a difficult process to undertake but it is (at amateur level) fraught with inconsistencies in colour uptake.

Just had a great afternoon 'circulating' despite a good soaking and rained off toward the end. A 'damp and slack' (tissue that is) situation if ever there was.

What's next BTW

Tug