G'day from Brisbane Oz...

[IC Engineered Designs]

Hi Guys,

I happened across this site quite by accident and what a fabulous site it is!

There are some fantastic projects underway here for sure, and I really do enjoy reading the stories of each.

A little about myself, 30+ years a fitter machinist, I got into CNC in the early 90's and consequently into 3D design and CAM.

Heavily involved in motor sport and full size aircraft over many years including RC as a hobby.

I'm entering semi retirement and in the process of setting up the workshop at home which includes the recent purchase of a Deckel Maho DMU70 5 axis (Early 2000 vintage), a Cincinnati Sabre 1000 (currently rebuilding with a Centroid Control).
All my design and analysis is done using Solidworks.

My pet project is a slightly unique power plant for a large scale P51D for which the design phase is complete with the next step being production once the workshop is up and running.

I've attached a rendering of the completed design....this engine is a 120cc V12 2 stroke with one goal in mind...to produce at least 0.2HP per cc based on proven single cylinder 2 stroke performance. (Time will tell!)LOL

Sites like this are fabulous research tools as there a many fabulous craftsmen with great ideas I've found.

I look forward to chatting and sharing the build as it progresses.

cheers,

Ian Cleland

Brisbane,
Australia

[MJM460]

Hi Ian, welcome to the forum from another Aussie from way, way down south somewhere.  You will fit right in here.  “Entirely by accident” is the way many of us who live in the far flung reaches of the internet, stumble onto this forum. 

Those are decent machines that you have, and I look forward to following your project.  I hope you will start a thread and show us some of the processes in making a quite complex project.

I assume you intention is to also complete a test rig to confirm its performance, another interesting challenge.

MJM460

[IC Engineered Designs]

G'day MJ,

Cheers!

I was 40 years in Melb before moving to QLD...I miss the food!!LOL

Yes indeed, I've completed a design for a variable capacity water brake optimised for around the 25HP mark.

I'll most definitely start a thread and share details, designs and construction as time goes on.

 

[Vixen]

Hello Ian
Welcome to the forum. Your V12 two stroke sounds like an ambitious and exciting engine. I will certainly be following  your progress. I guess a V12 two stroke will need some form of forced induction, what do you plan to do?

Mike

[deltatango]

Hello Ian,
Welcome to the forum from another in Melbourne. As MJM said, many of us stumbled into MEM and were pleasantly surprised by the friendly welcome from a bunch of very knowledgeable and skillful people.

The V-12 aero engine is impressive and I'm looking forward to hearing more about it.

Regards, David

[IC Engineered Designs]

Hi Mike,

Thanks for the welcome...

Negative on the forced induction.

The design incorporates and extremely low friction positive seal between cylinders along with rotary valve induction.
The rotary valves are fed from a common plenum...see attached.

[IC Engineered Designs]

Cheers David,

Thanks for the welcome...

I will in the next several months start a thread and get on with producing swarf.

I'm happy to answer any questions regarding the design.... certainly among fellow enthusiasts..on a dedicated forum such as this.

cheers,

Ian

[Vixen]

Hello Ian,

If there is no forced induction, are you planning to have twelve separate crankcase volumes, each with an individual rotary valve, to transfer/scavenge the the cylinders?
From the CAD images, it looks like your design work is well advanced.

Mike

[IC Engineered Designs]

Mike,

Correct on all counts...

The design is 100% complete.

The intermediate seals are manufactured...designed to cope with the surface speeds of nearly 27.5 m/s and of a bilateral twin lip design.

I designed the basic seal then enlisted a specialist manufacturer in the US to produce a workable seal.

The result of which is shown in the attached pic.

[Kim]

Hi Ian, and welcome to the forum!
I'm not an expert in IC but it looks like you're doing some really cool stuff.
Can't wait to read more about it.
Kim

[awake]

Welcome, Ian!

[IC Engineered Designs]

Cheers Guys,

Thanks for the warm welcome.

I'll start a thread in the correct area soon.

cheers,

Ian

[derekwarner]

Welcome Ian......

The sealing element is interesting...obviously CNC produced with a static O-ring encased into the OD & dual [reverse] energised lip seals for the shaft diameter....is it a 60% bronze filled PTFE?

That surface speed of ~~ 27m/second  for a rotary sealing element is near x twice the speed of any application I have seen ....

The Austrian based Economos GmbH introduced the World engineering sealing community into CNC production [over moulded],  of fluid sealing elements some 23 years ago

Looking forward to reading more

Derek

[IC Engineered Designs]

Hi Derek,

It is a fairly high speed application for this type of sealing element.

I have two materials to test, you are correct in that they are PTFE based.

They are both however proprietary materials, the first being a polymer filled PTFE and the second being a carbon fiber/ metal oxide filled PTFE. Needless to say, that's all the information the supplier furnished other than to say they would both stand up to elevated temps and the surface speed as indicated.

The caveat for this application is the requirement of a very hard wear surface. The crankshaft will be from H13 allowing high core strength, gas nitrided to achieve around 68 HRC before final grinding.
The high hardness certainly won't hurt as all bearings are rolling element.


cheers,

Ian

[derekwarner]

Back some 18 years we went down the path of attempting to reduce the PLC controlled dither and rod wear as being exerted by Moog electro hydraulic valves.......

The upshot of this is 'Teflon Plating'.......[nothing to d with saucepans] 

Using convention hard chrome plating [~~65RC] + grinding........when used with Teflon [PTFE] based CNC produced seals results in a transfer of Teflon into the microstructure or the ground chromium surface

This natural process then results in literally the Telfon based seal element gliding over the chromium surface with micro embedded Teflon, which then leads to the need for a better understanding the optimum level of surface roughness in the ground chromium [Ra & Rt] etc
 
This work was based upon my earlier 1986 experience with Teflon sealing elements in hydraulic systems for Gun Mounts & Missile Launcher on RAN vessels

Derek