Plan Drawings: Canless Fo Mi Chin II for Non-Shavers

Moderator: Mike Everman

Plan Drawings: Canless Fo Mi Chin II for Non-Shavers

Postby larry cottrill » Thu Jul 14, 2005 5:23 pm

I know this is what many of you have been waiting for. Here it is: a Fo Mi Chin II clone that should appeal to those of female persuausion or guys too young to shave, or maybe somebody who likes the basic design but just doesn't want to mess with trying to weld to a paper-thin steel can. This one is officially named the Reynstodyne FMCII(TM) in honor of its Fo Mi Chin roots.

Now, why would you want to build one of these? I'm so glad you asked. First, the engine is simple and can be built easily from 1 mm or thinner sheet steel. Second, the original Fo Mi Chin II has been declared particularly "sweet running" by no less than Bruno Ogorelec after independent testing [though he was not able to rave about it being particularly easy starting, for some reason]. Then, it is a very light and compact engine. AND, it achieves something few Reynst breathers can boast of: A small cross-sectional footprint. This engine can be put anywhere a Dynajet will fit [though I have not described any way of liquid fueling it]. But, all in all, it's a very small and convenient engine form to play around with.

There should be nothing really tricky about building this mill for anyone who is a competent metalworker and weldor. There are only two cones to form, and both are fairly small. The front "dome" cone can be styled as either the "classic" form with the plug mounted low, or you can use the FWE front dome instead, with the plug right at front dead center. Your choice. You should be able to do the whole works for ten or fifteen US dollars and a few hours of meticulous labor.

This engine should start and run exactly like the original Fo Mi Chin II, and might out-perform it slightly, since the rear cone of the chamber is smoother and better formed. Obviously, you could do a stainless version out of thinner material, if you don't mind forming the tailpipe and intake parts out of flat sheet.

Have fun!

L Cottrill
Attachments
Reynstodyne_FMC_II_scale.gif
Basic scale drawing of the new Reynstodyne FMCII(TM) valveless pulsejet. Drawing Copyright 2005 Larry Cottrill
Reynstodyne_FMC_II_scale.gif (7.35 KiB) Viewed 6969 times
Reynstodyne_FMC_II_intake_plan.gif
Scale detail drawing of the intake/tailpipe assembly. The dimensions are adjusted only slightly from the original Fo Mi Chin II plan, and the construction is unchanged. Drawing Copyright 2005 Larry Cottrill
Reynstodyne_FMC_II_intake_plan.gif (11.81 KiB) Viewed 6971 times
Reynstodyne_FMC_II_cone_sheet_1.gif
Rear cone sheet pattern for the new FMCII. Note the large notch for the intake half shell to pass through. Drawing Copyright 2005 Larry Cottrill
Reynstodyne_FMC_II_cone_sheet_1.gif (8.64 KiB) Viewed 6964 times
Reynstodyne_FMC_II_cone_sheet_2.gif
"Classic" front dome cone sheet pattern, with the plug located low in the "chin" of the chamber. Drawing Copyright 2005 Larry Cottrill
Reynstodyne_FMC_II_cone_sheet_2.gif (6.35 KiB) Viewed 6958 times
Lady_cone_sheet_2.jpg
FWE front dome cone sheet pattern. Use this one on your FMCII if you prefer your plug located front and center. Drawing Copyright 2005 Larry Cottrill
Lady_cone_sheet_2.jpg (70 KiB) Viewed 6966 times
FMCII_intake_finished_front_crop1_small.jpg
Front side view of the finished intake/tailpipe assembly. The turned-down snout at the front end is done entirely by heating and gentle hammering. Photo Copyright 2005 Larry Cottrill
FMCII_intake_finished_front_crop1_small.jpg (144.17 KiB) Viewed 6959 times
FMCII_intake_finished_bottom_crop1_small.jpg
Bottom view of the intake/tailpipe assembly, clearly showing the port that spouts into the middle of the chamber. Photo Copyright 2005 Larry Cottrill
FMCII_intake_finished_bottom_crop1_small.jpg (145.23 KiB) Viewed 6962 times
FMCII_chamber_intake_welded_crop1_small.jpg
Intake/tailpipe assembly welded in place on original Fo Mi Chin II. This should be MUCH easier on the clone version, since the chamber steel is heavier. Photo Copyright 2005 Larry Cottrill
FMCII_chamber_intake_welded_crop1_small.jpg (169.5 KiB) Viewed 6965 times
larry cottrill
 
Posts: 4140
Joined: Sun Oct 05, 2003 1:17 am
Location: Mingo, Iowa USA

re: Plan Drawings: Canless Fo Mi Chin II for Non-Shavers

Postby steve » Thu Jul 14, 2005 8:05 pm

you should post a link to this in the "looking for plans?" sticky at the top of the valveless section.

come to think of it, you should put all of your plans for engines that have been confirmed to work on the sticky as well!
Image
steve
 
Posts: 1029
Joined: Sun Jun 06, 2004 12:29 am
Location: Clinton Conneticut / Melbourne Flordia

Re: re: Plan Drawings: Canless Fo Mi Chin II for Non-Shavers

Postby larry cottrill » Tue Aug 02, 2005 7:33 pm

steve wrote:you should post a link to this in the "looking for plans?" sticky at the top of the valveless section.

come to think of it, you should put all of your plans for engines that have been confirmed to work on the sticky as well!

Done.

L Cottrill
larry cottrill
 
Posts: 4140
Joined: Sun Oct 05, 2003 1:17 am
Location: Mingo, Iowa USA

re: Plan Drawings: Canless Fo Mi Chin II for Non-Shavers

Postby hagent » Sat Aug 20, 2005 6:16 am

Hi Larry,

Did you ever get this one running? Any specs on performance?

And where do you buy that antenna tubing?

Thanks,

Hagen
Hagen Tannberg
hagent
 
Posts: 413
Joined: Sun Feb 06, 2005 9:01 pm
Location: Simi Valley CA

Re: re: Plan Drawings: Canless Fo Mi Chin II for Non-Shavers

Postby larry cottrill » Sat Aug 20, 2005 7:51 pm

hagent wrote:Hi Larry,
Did you ever get this one running? Any specs on performance?

No, I didn't build this one, since I built the prototype Fo Mi Chin II on which it is based. The Fo Mi Chin was run successfully by Bruno at Burning Grape, and he called it a very "sweet running" engine. That's as good as it gets for "performance figures" on that one. This one is my re-design for those who don't want to hassle with welding onto a shaving cream can. It is as close to identical to the prototype in terms of internal dimensions as I can get it, so there should be no reason to doubt that it will run well.

Go for it!

And where do you buy that antenna tubing?

Try Menards, Home Depot, Porter's Do-It Store, etc. It is painted a sort of bronze or "antique gold" kind of color, and comes in 5 ft and 8 ft lengths, I believe. However, you have to waste about 5-6 inches of each end. It costs around a dollar a foot. It is mild steel, well under 1 mm in thickness, with a welded seam. It cuts like cardboard with a good hacksaw and welds very nicely using mild steel rod.

L Cottrill
larry cottrill
 
Posts: 4140
Joined: Sun Oct 05, 2003 1:17 am
Location: Mingo, Iowa USA


Return to Valveless pulsejet forum

Who is online

Users browsing this forum: Google [Bot], Yahoo [Bot] and 2 guests