supercharged V12 2 stroke

Dean

This is turning out to be more a work of art, its absolutely mind blowing as far as I am concerned. I am in awe of people with skills like this.

Thanks for sharing

Martin

No problem, thank you very much for the kind words. I must admit that the project has been somewhat challenging to my skills and patience but I have found it very rewarding to see such interest by other people ( helps keep me motivated to work through the problems I've faced machining some of the parts). As soon as i have the bottom end completed i will do another assembled so far shot.

cheers for now

Dean

Well i have just finished the spinner nut and prop driver and have started machining the split main bearing block. this has been sized and split, surfaced and the bolt holes have been drilled and tapped ready to turn the bearings.

here are some photos of them and some progress assembled shots, the prop is 16x6.

cheers for now

Dean

Edited By dean clarke 2 on 12/02/2014 08:13:46

Dean

The size of this wonderful creation has been coming clearer in the past few posts. Any chance of a shot of it in the palm of your hand?

Did you say what the CC will be?

I can also see the ME109 connection.

Pete

Hi Pete, this engine is nominal 70cc

cheers

dean

Edited By dean clarke 2 on 13/02/2014 06:50:11

Well, Cambridge NZ is just down the road from me, and as it happens I have a Dornier Do335 just about ready to go, but of course that would need another one of these.

John

LOL, Actually me too!! 85" span, don't know if I have the mental fortitude to make another one of these tho, well maybee. You are more then welcome to pop out for a coffee and a look see if you want.

dean

Would that be the ESM one? I have a 160 twin for the front of mine, and a 120 single for the back. A fairly small amount remains to be done, although I am not sure if I have the confidence to fly it yet.

12 of everything seems like enough trouble, 24 would start to seem like work instead of a hobby!

I'd like to take you up on dropping in some time. Actually we are living in the Big smoke and thinking of bailing out quite soon to retire somewhere nicer, and Cambridge is quite high on the list of possible destinations.

John

Well it's been some time since an update and things have been a bit less than ideal in some ways. Got all the main bearings done and sized to the block and crank and went to assemble them together and discovered that horror of horrors they didn't want to go all the way into the crankcase bore. BUGGER!!!!!!!!!!!!! upon investigation it was discovered that somehow the crankshaft had become not so straight in the main journal department! so after a great deal of swearing and tanty throwing i finally decided it was time to leave it alone for a bit and have a strong sedative cup of tea. Having thought about it for awhile i decided to mount the crank in a Collette chuck from the front main bearing and fit the 2 ball races to the rear main and set them up i a small scroll chuck in the tail stock. having done this i could plainly see that the front two center main bearings were not rotating at all in the same line as the rest of the crank whilst the rear three were not so bad, not perfect either i might add but not too far out. Now how the hell did that happen??? And more importantly how the heck am i going to fix it!!!!!!!!!!!!! So after i bit of thought i simply remachined all the mains down to a smaller size also remachining the flywheel diameters and chamfers , thrust faces etc, reground and polished to an acceptable finish. Now everything turns as it should between the two main end bearings. Now to make replacement split mains and the then refit the crank to the case. I will also take the time now to make the sump plate and the engine mounting holes so the case will be completed in the next workshop session. Here is a photo of the remachined crank and the split main bearings. I will update the photo album and thread when the rest of the case is also all done.

cheers for now

dean

Edited By dean clarke 2 on 02/03/2014 04:46:11

Dean,

Top Marks for Anger-Management !!

Keep up the amazing work ... it's a joy to see.

MichaelG.

Maybe a case for machining almost to size, then leaving it for a time to settle down, then take off the last few thou. Good rescue job. Ian S C

Thanks yea it was a close thing, i will have to look at how i go about machining the crank and change the sequence i think. nearly got the whole bottom end finished and i will update everyone with progress and photos in the next few days (hopefully)

cheers for now

dean

Great work so far Dean, well done! JD

Ok so after a great deal of time spent doing everything but engine building i have finally been able to advance this v12 build project a little bit.! after the last debacle with the crankshaft and its "not so straightness" i must confess to suffering from a little bit of the depressive can't be bothereditess so it has been somewhat longer then intended between workshop sessions.( that and being flat out with work and whatnot). So where do things stand at present? Well the engine block is now complete with conrod grooves and mounting holes and a very nice polish finish i think also. The crank is now final fitted with split mains complete with pressure fed lubricating holes. front and rear covers on to stay and also the rear drive for the supercharger is made and fitted. Here are some photos showing the latest bits and assy etc.

cheers for now

Dean

Now its onto the conrods and pistons, or maybee the blower rotor and vanes, we'll see.

Dean

Dean, you cannot stop now. This work of art as you have shown is full of trials and tribulations and "can't be bothereditess" is the hurdle you must (just for your fans, me included) overcome. More power required Egore.

Alan

LOL yea i know i wouldn't sleep at night if I didn't get it finished and hear that loverly whiney bark burst from those loverly exhaust elbows. Luckily the ole can'tbebothereditess is only a temporary affliction and once i have got rid of a couple of dragging on jobs on the home front all energy and power will become focused on the completion of this beast ( and a couple of other little surprises too eh, he he he)

cheers for now

dean

Ok so now i am just in the finishing stages of the supercharger. All thats left is to machine the vane slots and make the actual vanes. While it took quite a bit of fiddling around to get the alignment of the rotor vane and end caps etc right I got there in the end.

cheers

dean

The vanes are cut from 1/16 th phenolic and the drive pulley system will be mounted on a steel hub with an aluminium pulley to allow for easy pulley changes when experimenting with drive speeds.

That's fantastic Dean!! Great work. I especially liked your self control with the crankshaft!

All the best, keep up the good work.

cheers

Bill

Well here's the supercharger drive assembly all finished, now its onto the conrods and pistons

thanks

dean

Dean, your engine and supercharger look great. Congratulations on a fine job.

One note of caution though on the supercharger drive. I have designed several o-ring drives in office machines, to drive rollers by electric motors. In these machines I followed the o-ring maker's design guides for best practices and power to be transmitted etc. Unfortunately these drives were not successful, either not able to transmit the power required, or with rapid wear, or with severe flapping at high speeds.

Not saying yours won't work, it might. Just suggesting to leave room for toothed belt and synchronous pulleys drive, as a backup plan, in case of trouble with the o-rings.

I had best success with Gates PGGT 2mm and 3mm synchronous belt systems in office equipment and in later machine designs for automation equipment. If you do use such a system, be sure to call the belt suppliers to check that sizes selected are currently available, and do buy some spares in case they are discontinued at some point in future. You can also purchase pre-milled aluminum pulley stock from Gates and bore to suit.

Good luck, JD