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Antiques or Out of Business > Any electric Cricket out there?
 
 
SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		Did anyone converted their Cricket to an electric? I bought a Cricket from some one a few years ago. It never came with the clutch, start cone or an engine. It looked real easy to convert one to electric. Mine is just hanging in the hangar for nostalgia like my other oldies.
10-03-2009 07:00 AM
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v22chap
Veteran
Location: Howe, Indiana

My Posts This: Topic  Forum		Been going to do mine also ,,, but just have to much other stuff in the fire right now ,,,with moving and finishing off the basement in the new house and her changing jobs and not being able to help much


Like you I don't think it to be to hard .... a simple motor mount and some timing belt pulley's of different sizes for the motor so you can play around with the gear ratio and you should be good to go ,,, This gear ratio / motor / size will be the toughest part ... find a good online motor/ gear ratio calc or figure it on your calculator and it should get you close .

Good luck and keep us all posted on the build if you go with it .

Larry C ----------Bergen R/C helicopters
10-03-2009 12:36 PM
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R-Moore74
Senior Heliman
Location: norway

My Posts This: Topic  Forum		...electric would be fun alright! On the other hand I do have a spare OS 28 with the whole clutch assembly....just in case someone REALLY needs one. I have a complete cricket but it has not flown yet as I also have a lot of other projects in the fire!


Bent Are

BEntHeli
Who says it can't fly? - Just watch and I'll make it!!
10-05-2009 11:17 AM
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heli_headcase
Key Veteran
Location: Hovering around Atlanta

My Posts This: Topic  Forum		Determining the pulley (and overall gear) ratio will be quite a trick. Whom knows the supposed full-power RPM of a Cricket? Being fixed pitch you'd really want to calculate the best efficiency current for a nominal hover RPM and have some reserve for a solid climb.

Motor K/V comes into it too so with the choice of ratios and motor voltage characteristics you could find yourself with a wild Cricket!

Remember that the ESC will have to be proper for fixed-wing aircraft and have a sharp and consistent throttle response. I was tempted to throw in the suggestion of running in Governor mode but was afraid someone would take me serious and try it

Electrify everything - the airframe and radio components will thank you.


HHC

So many heli's - too little time...
10-08-2009 02:47 AM
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SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		>>Determining the pulley (and overall gear) ratio will be quite a trick. Whom knows the supposed full-power RPM of a Cricket?<<

I don't think it is that hard. I bet you the head speed did not exceed 2000 rpm in those days. There are not thrust bearings in those blade grips.

>>Motor K/V comes into it too so with the choice of ratios and motor voltage characteristics you could find yourself with a wild Cricket!<<

Once I determined the head speed the motor kV would be easy.

>>Remember that the ESC will have to be proper for fixed-wing aircraft and have a sharp and consistent throttle response. I was tempted to throw in the suggestion of running in Governor mode but was afraid someone would take me serious and try it <<

Not a fixed pitch. I have to run it as a fixed wing setup. The throttle will be more or less linear.

Hansen
10-08-2009 06:06 AM
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v22chap
Veteran
Location: Howe, Indiana

My Posts This: Topic  Forum		Hansen
I don't think there were any wood bladed helis that run 2000 RPM ... I don't think they would stay on ... better start more in the 1100 to 1400 area

Larry C ----------Bergen R/C helicopters
10-08-2009 01:52 PM
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heli_headcase
Key Veteran
Location: Hovering around Atlanta

My Posts This: Topic  Forum
Quote 
I don't think it is that hard. I bet you the head speed did not exceed 2000 rpm in those days.

The overall head speed will be determined by the desired pitch setting of the blades. Remember, the Cricket was designed around an engine with mostly fixed RPM characteristics and the pitch was set to take advantage of what the engine could produce. Now with electric power the pilot can choose to modify the head speed as desired to change the flying qualities. Higher overall speed (lower pitch) has some serious benefits since it means you can better maintain cyclic control when wanting to descend from altitude without having to drop the RPM down into the 'mushy region' but still knock enough lift off to descend at a reasonable rate.

Quote 
There are not thrust bearings in those blade grips.

There are not ANY bearings in "those blade grips" There are no blade grips per-say.

Quote 
Once I determined the head speed the motor kV would be easy.

Sure but you need to determine that still. Someone should do some taching of a crisply flying Cricket and report back on the hover as well as climb RPM.

Quote 
Not a fixed pitch. I have to run it as a fixed wing setup. The throttle will be more or less linear.

Yes, that's what I said. Not sure what you mean by "Not a fixed pitch." It is fixed pitch which is why you use a fixed-wing throttle setup. Do you remember or have any experience with the early MS Hornet, fixed-pitch heli's? They were sold with a little ESC operating a brushed motor. That ESC was 'steppy', meaning it had poor throttle stick resolution and it had a small delay in seeing throttle changes. Made for quite a challenge to fly at a constant hover height. Electric Cricket would be cool. Has anyone here seen Gerd's e-conversion of the Heli-Baby? Very nice!


HHC

So many heli's - too little time...
10-08-2009 02:04 PM
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v22chap
Veteran
Location: Howe, Indiana

My Posts This: Topic  Forum
Quote 
Has anyone here seen Gerd's e-conversion of the Heli-Baby? Very nice!
Yes I saw it at IRCHA when he was there ... but he also had a collective swift head on the one I saw ....

Larry C ----------Bergen R/C helicopters
10-08-2009 02:26 PM
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SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		>>Not sure what you mean by "Not a fixed pitch."<<

Missing words here.;-) "Not in a fixed pitch" we don't use governor mode.

>> Do you remember or have any experience with the early MS Hornet, fixed-pitch heli's?<<

Yes, I am still flying a fixed pitch Piccolo turned into a "Moth".

>> Made for quite a challenge to fly at a constant hover height.<<

A lot of anticipation was required.

>>Electric Cricket would be cool. Has anyone here seen Gerd's e-conversion of the Heli-Baby? Very nice!<<

Minimally no oil to mess up the heli. No, do you have a link?

>>I don't think there were any wood bladed helis that run 2000 RPM ... I don't think they would stay on ... better start more in the 1100 to 1400 area<<

That's why I said below 2000 rpm. Actually wood blades are lighter with less inertia so you don't mind spinning them up.
10-08-2009 07:16 PM
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v22chap
Veteran
Location: Howe, Indiana

My Posts This: Topic  Forum
Quote 
That's why I said below 2000 rpm. Actually wood blades are lighter with less inertia so you don't mind spinning them up.
Ya ,,but larger (than picolo) wood blades like the cricket without any blade root reinforcement will fly out of their holders at high RPM's (and it don't have to be much above 1400) and don't ask me how I know this

Larry C ----------Bergen R/C helicopters
10-08-2009 08:22 PM
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heli_headcase
Key Veteran
Location: Hovering around Atlanta

My Posts This: Topic  Forum
Quote 
Minimally no oil to mess up the heli. No, do you have a link?

No link to any video currently known. I watched the Heli-Baby flown in person last year at IRCHA 2008. There was something magical about it. So converting a Cricket to e-power should be just as nice. Quick, someone do it!


HHC

So many heli's - too little time...
10-08-2009 08:37 PM
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SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		>>(and it don't have to be much above 1400) and don't ask me how I know this <<

OK, you can't beat the voice of the experienced. I will keep it under 1400. That sounds awfully slow.

>>Quick, someone do it!<<

The conversion is easy but the refurbishing my old Cricket is hard. Right now I am working on converting an old Hirobo Shuttle first. Maybe after this.
10-08-2009 10:00 PM
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Antiques or Out of Business > Any electric Cricket out there?
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