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Cylinder taper is simply larger diameter at bottom end about 0,01-0,02 mm. Piston at bdc have clearance(meaning less drag) and at tdc is tight.

Inner surface of the liner was lapped with 320 grit valve compound.

Hi all Here my biggest toy finished Next run with modified carburetor

Just add wings and seat and fly.

Pěkná práce!

Uncle Google say Here: http://www.machineconcepts.co.uk/engines/nelson/nelson.htm

https://www.homemodelenginemachinist.com/threads/mp-3-2cc-glow-engine.26858/

I'm glad you're happy :) I holding my previous 3,2cc baby (what you can find here).

Do you talk about this one? https://www.adriansmodelaeroengines.com/catalog/product.php?cat_id=40&pid=253

Ahoj F-DS Did you saw this Felgiebel build thread?Just for inspiration. https://www.homemodelenginemachinist.com/threads/building-the-felgiebel.27541/

Its more ways to turn crankshaft. I personally turn them in four jaw chuck out of ht bolt. Plans do not contain one important note- cylinder bore must be tapered!

My first engine was Boll aero too. If you want made crankshaft with separate crankpin, i dont recommend use loctite.Crankpin must be pressed into web.Slide fit+ loctite leads to fail.Imo best option is one piece crankshaft. It be better make cylinder with bigger bore diameter- bigger...

Machining these "Z" rings looks a bit tricky. It would be a simpler make two thiner ordinary rings and gaps oriented opposite.

Make drawings are planned, but there is not enough time.

This engine is my version of these classic stars.

Frankly in near future not ;) Liner is made from scrap mild steel shaft and piston is out of cast iron "puck".

Hi Everyone ! This Boy is my new engine project. Finaly finished and documented :) Parameters are: Bore 19mm Stroke 17mm volume 4,82cc or .29 cu.in Tested on prop MA 9x4 Fuel FAI 74/26 Plug hot Video here:

Hi Kevork Your build is interesting.I saw latest engine porting changes and have a question.You really need your engine running at 30000+ rpm?

Hi C-mario I read your problems with engine starting.If you make needle valve as in plan (needle taper and fine 4mm thread) you need open at full 4 turn to run rich (if i remember corectly). If you put about 1/2ml of fuel into carb,few times flick and connect igniter.Engine will run.Do not put...

Hi Gerard My conversion was actually with reed valve and not rotary valve. "final" version of reed was looks much simpler. Thin steel reed screved on the backplate. Reed cover that you may see above was removed,because it caused power drop. Reed engine have excellent starting ability ,but often...