(This from Ron's Model Engine News website: an outbreak of Weaver Fever resulted in Weaver examples from Ken Croft, He improved the inlet timing and reports 10,500 rpm on a 7x4 prop. This was the diesel version.
As far as i know it's not produced as a kit anymore, Mine is scratchbuilt and the plans are available on outerzone, and you can get a printed copy from the AMA plans service if you're in the U.S.
I really enjoy watching you build the engine and trying it out and overcoming issues. Do you ever think it would be so much easier to use and electric motor and battery? Myself, I find most of the enjoyment is in building! Keep up the great work.
Never sounds like it's coming up to peak lean. What nitro content are you using? Might just need more run-in time but bumping up the nitro to 20 or 25% would help. June 1952, Model Maker ran a series of articles: A 1 c.c. C.I. Engine. a simple compression ignition engine (aka "diesel") called the "Weaver/Ransom" after the designer and draftsman, The engine is still remembered in MICE circles, being often referred to simply as "The Weaver".
Yeah it never did run well in this video. that's 20% nitro. i've since gotten it running a lot better in diesel form, around 6500 rpm on an 8X5 but it seems breathing restricted, it runs much worse with a smaller prop. the twin version has much bigger transfer ports so with any luck it shoud be much better in that regard.
It's really great work and fun to watching!! I found your channel just an hour ago and you made my day! I hope your skill make this world more fun or great than today! One day not long time later, I dream your engine will be famous around the world! I'm Japanese and not fluent English so please don't be strict about my words even if my sentences or something was wrong>< At least I'm positively writing this comment. Thank you for showing amazing skill and uploading enjoyable video!
A thought regarding propellers. Often with free flight models, low pitch propellers (3", 4") are used so that a larger diameter propeller can be used - giving more thrust. But since your motor is turning only 6000 rpm at best, low pitch propellers may not result in a flying speed greater than the stall speed. On a 4" pitch prop 6000 rpm is only 23 mph and 3" pitch is only 17 mph. A Cox .049 on a 6x3 might be doing 15,000 rpm. But even at 12000 rpm the "pitch speed" of 34 mph would clearly be above the stall speed of the model and thus viable for flight. Since your motor seemed to like larger props, perhaps you could find a 6" pitch prop and give that a go ...
That is the Spirit that I live for !!! Spent years in Robins garage as I watched and learned the Art of Aeromodeling ... keep it Going you gotta know how much we all learn from you ...
I thought the same, i tried a 6X3 but it barely ran and was super sensitive to the needle. it actually runs the best, and fastest(?) on the 8X4. i suspect it's due to the port size and arrangement, it can't breathe well enough to break past around 6000 Rpm
This is myone and only goal with home machining: Building practical tiny engines. You're livin' the dream! Once I get done with my 71 C10 project I might start buying up some tooling to start down this path.
@@terrymoorecnc2500 My supposition is that it's not got quite enough transfer port area - it was also designed in the late 40's, with a long stroke and fairly heavy rotating assembly. it actually turned faster, with a larger prop lol. with the turbo plug it barely ran on a 6X3. I was thinking of making the transfer ports bigger and reducing the weight of the piston assembly but i think i'm gonna put this one on the shelf for now, i've got lots of other things i want to work on.
(This from Ron's Model Engine News website: an outbreak of Weaver Fever resulted in Weaver examples from Ken Croft, He improved the inlet timing and reports 10,500 rpm on a 7x4 prop. This was the diesel version.
Where can a guy get a kit for the plane? Great looking model and have a couple old COX laying around. Great videos by the way!
As far as i know it's not produced as a kit anymore, Mine is scratchbuilt and the plans are available on outerzone, and you can get a printed copy from the AMA plans service if you're in the U.S.
@@JellyFishMachine thanks for the info!
I really enjoy watching you build the engine and trying it out and overcoming issues.
Do you ever think it would be so much easier to use and electric motor and battery?
Myself, I find most of the enjoyment is in building!
Keep up the great work.
I fly gliders mostly, and all but 2 have electric motors for launching! this is the only fuel powered airplane i have lol.
Very nice and very cool engines.
Never sounds like it's coming up to peak lean. What nitro content are you using? Might just need more run-in time but bumping up the nitro to 20 or 25% would help. June 1952, Model Maker ran a series of articles: A 1 c.c. C.I. Engine. a simple compression ignition engine (aka "diesel") called the "Weaver/Ransom" after the designer and draftsman, The engine is still remembered in MICE circles, being often referred to simply as "The Weaver".
Yeah it never did run well in this video. that's 20% nitro.
i've since gotten it running a lot better in diesel form, around 6500 rpm on an 8X5 but it seems breathing restricted, it runs much worse with a smaller prop. the twin version has much bigger transfer ports so with any luck it shoud be much better in that regard.
It's really great work and fun to watching!!
I found your channel just an hour ago and you made my day!
I hope your skill make this world more fun or great than today!
One day not long time later, I dream your engine will be famous around the world!
I'm Japanese and not fluent English so please don't be strict about my words even if my sentences or something was wrong><
At least I'm positively writing this comment.
Thank you for showing amazing skill and uploading enjoyable video!
Excellent from Greece!
What wingspan has that Diamond Demon? 49" or did you scale it down a bit?
it's normal scale, 49"
A thought regarding propellers. Often with free flight models, low pitch propellers (3", 4") are used so that a larger diameter propeller can be used - giving more thrust. But since your motor is turning only 6000 rpm at best, low pitch propellers may not result in a flying speed greater than the stall speed. On a 4" pitch prop 6000 rpm is only 23 mph and 3" pitch is only 17 mph. A Cox .049 on a 6x3 might be doing 15,000 rpm. But even at 12000 rpm the "pitch speed" of 34 mph would clearly be above the stall speed of the model and thus viable for flight. Since your motor seemed to like larger props, perhaps you could find a 6" pitch prop and give that a go ...
That is the Spirit that I live for !!! Spent years in Robins garage as I watched and learned the Art of Aeromodeling ... keep it Going you gotta know how much we all learn from you ...
Great job man! It seems like it needed more air fuel. Rotary valve or reed is the way to go. Maybe test crank case pressure as well
For normal free flight this engine will do great for that size model
Great stuff! You can't argue with flight proven hardware.
This was very therapeutic to watch!
I think you should try a smaller prop, for exaple 7x3,5...my little 1,5 cc cipolla junior used that one and run a lot
I thought the same, i tried a 6X3 but it barely ran and was super sensitive to the needle. it actually runs the best, and fastest(?) on the 8X4. i suspect it's due to the port size and arrangement, it can't breathe well enough to break past around 6000 Rpm
@@JellyFishMachine sensitive on needle with small prop can indicate need for more compression - info from pylon racing days
Those glo engines will give u grey hair trying to get em runnin right
Hi Nick I shared this video on my facebook. Looking good sir!!
yes, I think you are right, ports arrangement, should be improved...in any case you made a great work...very nice
Wood, paper, dope, hours of work...KEEP THE OLD SCHOOL ALIVE!!! ✌
More engine building videos please. That lot were fascinating.
Excellent Flight
Thanks for the video
Most guys I know run 35-40 % nitro for those small engines. Have you ever tried hotter fuel? Wonderful machine work excellent skills.
You are using to much prop. It never 2 cycles. Love your videos
A 7x6 hyper balanced wooden prop would help.
This is why i chose electrical engineering lol.
How would you generate electricity without mechanical. How would you manufacture electric motors?
This is myone and only goal with home machining: Building practical tiny engines. You're livin' the dream!
Once I get done with my 71 C10 project I might start buying up some tooling to start down this path.
I think the exhaust ports look rather small IMO....🤔😏🇬🇧 What was the name of the model please..?..
I guess i forgot to put that in the video... it's called tha diamond demon. outerzone.co.uk/plan_details.asp?ID=8646
@@JellyFishMachine Thanks, I love these old Free Flight planes...I just Maidened my Linnet from 1954...🤔😏🇬🇧
Do a cargo plane but for engines but I like your video and subscribe thanks 👍
I can't wait for a two cylinder version!
Is that tank vented?
yes, just a hole in the top to fill it with
@@JellyFishMachine doesn't sound like it ever peaks. Almost like it's starving for fuel under load.
@@terrymoorecnc2500 My supposition is that it's not got quite enough transfer port area - it was also designed in the late 40's, with a long stroke and fairly heavy rotating assembly. it actually turned faster, with a larger prop lol. with the turbo plug it barely ran on a 6X3. I was thinking of making the transfer ports bigger and reducing the weight of the piston assembly but i think i'm gonna put this one on the shelf for now, i've got lots of other things i want to work on.