WT2527 15cc Glow Engine

Hi Craig nice to see a finished motor running nice piece of work.

David

Hi all,

Small update. Ran the engine again with the timing gears in correct location. Definitely an improvement at the top end rpm, up to around 5500rpm.

Interestingly the bottom end is now not so smooth as it was before, but not too bad.

My next plan to improve the rpm is to try making another set of valve springs that are a bit stiffer as I suspect the bounce back on the valves could be limiting.

Cheers

Craig

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Hopefully when it runs in properly I might be able to get the bottom end tuned in again.

Currently using a 14x8, but plan to try a 13x6 and 13x8 this weekend.

Will keep you posted.

Craig

Lovely job Craig. Thanks for sharing the photo's, there is a lot of effort required to keep on top of the photo's whilst trying to produce a quality set of parts, which can be tough enough!

Regards

Steve

Hi all, a bit of an update.

So I had decided to try making a new piston with 2 rings rather than 1 as the plans have. There was not enough room to fit 2 on the original due to the cut out used to fix to the gudgeon pin with c-clips plus the diameter of the gudgeon pin. I used Autodesk Inventor to design a new one, Obviously had to keep the distance from the centre line of the gudgeon pin to the top of piston the same to retain the same compression ratio, so reduced the gudgeon pin diameter and also did away with the c-clip fastening, instead using bronze plugs at each end of the pin to keep centre.

I had a few problems cutting perfectly perpendicular ring slots in the piston, but eventually suceeded (thanks to all suggestions from my post for help on the other page).

Happy to report after a few tanks of fuel through it today, and a bit of fiddling with carb settings I have managed to get it running fairly smooth and reliable. The range is now 2600-7600rpm, with the top end getting a bit higher with each run.

Very happy and starting to think that I will actually be able to put it in the plane that I've built especially for it.

A short video of one of the engine runs below:

Excellent, very nicely done.

Rod

Great work Craig, sounds lovely, hope you get many happy hours flying it.

thanks guys. The engine is now running solidly up to 8000rpm on a 14x8 prop and has had another 6 or so tanks of fuel through it. Reckon she is ready to spread her wings this weekend weather permitting.

A double maiden of the plane and the engine.

Hope it flies well and many happy flying hours to follow.

Great engine and plane Craig! Happy flights (and happier landings)

Hi all,

Just to wrap this thread up, below is a link to successful maiden of the Spacewalker with the WT2527 engine. Just gave it a short flight and landed (sucessfully) so I could check everything. Happy with results. Hope to get her out again soon.

Hi Craig, well done, sounds great.

Emgee

Thanks for the work you have put in its nice to see the end product in flight. It must be very satisfying. You don't always see the end of a build.

David