quickie engine problem solved

[towplane]

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!.

 

[Kent Ashton]

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.

[towplane]

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?

[Kent Ashton]

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.

[Eugen]

Hello Chris,

nice engine! My engine is on the way 🙂

which prop you did on that engine ? Dia? Pitch?

 

[towplane]

On ‎2‎/‎6‎/‎2022 at 10:53 AM, Eugen said:

Hello Chris,

nice engine! My engine is on the way 🙂

which prop you did on that engine ? Dia? Pitch?

 

eugen is that a q2 diagram?  mines a Rutan model 54 (quickie)

[Eugen]

18 hours ago, towplane said:

eugen is that a q2 diagram?  mines a Rutan model 54 (quickie)

Yes its a Q2 and comes from Autodesk fusion360.

im on my way to build the q1 wing after fuselage is done so far. Would like to share with you details about the engine. I had some questions…..

[Eugen]

@towplane , I send you a message. 

[Eugen]

Did anyone in touch with towplane? I send him some notes and emails but not response so far. thanks.

[towplane]

sorry Eugen just saw your post.  can you call california where i'm stuck for free r cheap?  chris.  530 409 6101.  or better is towplane@gmail.com.  thanks, chris