Looking to build an airplane engine

[Uncle Buck]

Don't need it for anything, just thought it would be fun and cool...

this one looks interesting:

Webster NGEZ

I'm looking for something like this...

not looking into anything high tech, just something simple to start off with...
the basic. I wouldn't mind building this, just want to see what else is out there.

I don't mind paying reasonably for plans either

Thanks and Cheers
Goran

[stevehuckss396]

There is a book by "The motor boys" that is supposed to have plans for a bunch of small engines very much like the one you have posted. Follow this link and at the top left there is a link to the boys. The book is 20 bucks and has plans for 10 or more engines


http://modelenginenews.org/

[joe 3]

I am also looking for a beginners engine, and I think the problem with the one you posted as well as most of the Motor Boys engines is that they are Diesels. They require a high compression ratio, so your piston needs to seal very well to the cylinder. Unless you can source a ready-made piston/liner combo, this might be hard to achieve.

[Mcgyver]

Originally Posted by joe 3 I am also looking for a beginners engine, and I think the problem with the one you posted as well as most of the Motor Boys engines is that they are Diesels. They require a high compression ratio, so your piston needs to seal very well to the cylinder. Unless you can source a ready-made piston/liner combo, this might be hard to achieve.

I would think the simplicity and minimal parts would make them ideal beginners projects. what clearance is there on the cylinder and bore? At some point, nothing useful can be made if parts can't be turned and bored to size.

imo the trick to best of class piston/cylinder fits is to learn how to make and use laps. unlike honing, a lap used properly will correct errors in the bore. you end up with a perfectly parallel round bore that you can take up to a mirror finish. with this homemade equipment you can produce fits and finishes with any old lathe that'll look and perform like you've a shop full of the best grinding equipment.

if you are interested in making engines, here's some notes and pics i did on how to lap bores. for the smaller bore of the aero engines, the barrel lap is most appropriate imo

http://bbs.homeshopmachinist.net/sho...highlight=laps

[stevehuckss396]

Originally Posted by joe 3 I am also looking for a beginners engine, and I think the problem with the one you posted as well as most of the Motor Boys engines is that they are Diesels. They require a high compression ratio, so your piston needs to seal very well to the cylinder. Unless you can source a ready-made piston/liner combo, this might be hard to achieve.

Good point! Try this one. Uses cox cylinders and minimal parts. Only bad part is the tap is a bit pricy. But you could always get around that by cutting the threads on the lathe. I have the plans for the first and bought the kit for the second. Plan on building both after i finish the little Bugatti.


http://www.jamesengine.com/index_files/Page486.htm

or if you have a few more bucks.

http://www.jamesengine.com/index_files/Page662.htm

Steve
http://forum.bugattibuilder.com/phot...s.php?album=27

[jans123]

If you want to see some advanced hobby engine, built by a "hobby pro", with parts partly cnc-machined you can look at this guy: http://fly.to/orkenrud
Just if you ever doubt that the sky is the limit...
All have been up and running exempt for the Merlin, not yet...
/Jan
(I'm far behind and green in envy and I haven't even bult a single cylinder two stroke yet)