Jump to content
Sign in to follow this  
towplane

quickie engine problem solved

Recommended Posts

I think most quickie pilots will agree that the plane is fine except for the powerplant.  Kohler was the first industrial engine mfgr. to come up with a 90 degree twin, so that's what I used.  Midwest Super Cubs (MSC) has a long history of making these engines perform reliably so the basic CH 25 (25 hp) was slightly modified:

  • factory iron flywheel replaced with one duplicated in 6061 Al;
  • crankshaft extension machined from 7071 Al;
  • power take off is from flywheel end in order to keep cooling airflow as designed and reduce torsional harmonics;
  • governor assembly removed;
  • aluminum intake manifold replaced with plastic one from MSC'
  • ground-adjustable main jet from MSC
  • rotating assembly balanced, cam ground, heads ported & matched by MSC;
  • all metal parts except flywheel (has magnets) cryogenically treated by Cryogenics International;
  • Earls Performance oil cooler;
  • CH18 coils substituted for the CH25 Smart Spark so that engine can run without battery;

This Quickie had 300 hours with the Onan, and so far has 18 with the CH 25.  Climbs 600 fpm @ 69 kias, gets over 100 mpg @ 73kias, goes 103 kias at 3600 rpm using 1.5 gph.

the firewall forward weighs 1 pound more than the Onan did, and has an electric starter.  Briggs, Honda, Subaru, and now Yamaha all make a similar engine.  Kawasaki's is water-cooled.  Hopefully folks will use one of these engines and get the Quickie fleet flying again!.

 

6061.jpg

7071.jpg

kohlur.jpg

atop.jpg

bcow.jpg

ee.jpg

onan.jpg

barkeep.jpg

  • Like 1

Share this post


Link to post
Share on other sites
13 minutes ago, towplane said:

gets over 100 mpg @ 73kias, goes 103 kias at 3600 rpm

Nice writeup.  I only recall seeing one Quickie here on the east coast with some kind of pull-starter engine.  Very interesting to see him get running.

Share this post


Link to post
Share on other sites
On ‎11‎/‎6‎/‎2018 at 7:42 AM, Kent Ashton said:

Nice writeup.  I only recall seeing one Quickie here on the east coast with some kind of pull-starter engine.  Very interesting to see him get running.

Thanks, Kent.  No one's contacted me yet about details as to how to get their quickie going so I have to get the word out better. Maybe should offer it to Kitplanes?

Share this post


Link to post
Share on other sites

You might try this forum  http://www.quickheads.com   or the Quickie Yahoo group.   If you want to sell it, I'd post it on Barnstormers.  I suspect there are just not many active Quickie builders these days.  Post some flying stories or building experiences.  People are interested in those kinds of threads.

Nice of you to offer help, though.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×