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Author Topic: Ms Jenny - Capacitor Power  (Read 1235 times)
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_shadow_
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« on: February 07, 2018, 10:52:52 AM »

Indoor, 16" wingspan, reduced from Vic Smeed's Tomboy, elongated nose, simplified construction, 12.75g as pictured.

Naming her Ms.Jenny.

Regards
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Ms Jenny - Capacitor Power
Ms Jenny - Capacitor Power
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raggedflyer
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« Reply #1 on: February 07, 2018, 12:46:47 PM »

I like that. What is the motor and super cap type?
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_shadow_
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« Reply #2 on: February 07, 2018, 06:58:02 PM »

I like that. What is the motor and super cap type?

Motor is from Hobbyking, GPS-6, geared running 4x2.5 prop. Capacitor is 4.7F 2.7V.

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Re: Ms Jenny - Capacitor Power
« Last Edit: February 07, 2018, 07:17:37 PM by _shadow_ » Logged
_shadow_
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« Reply #3 on: February 09, 2018, 05:25:32 AM »

A short video on motor's run.

https://youtu.be/Svsao86EwFA


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lincoln
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« Reply #4 on: February 09, 2018, 07:32:37 AM »

Nice. I like the way you have the capacitor where an IC motor's cylinder would be.  Put fins on it and paint it black?
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_shadow_
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« Reply #5 on: February 09, 2018, 10:10:18 PM »

Nice. I like the way you have the capacitor where an IC motor's cylinder would be.  Put fins on it and paint it black?

Maybe if it needs the weight for balancing...was thinking of also installing bolt/bar for compression adjustment, diesel engine.

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dieterperiperi
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« Reply #6 on: February 10, 2018, 03:21:04 AM »

Thats a neat little set up Shaddow, end very light.
How ready made do you buy that setup?
Id love to dabble in that sort of thing but need to do some diligence first

Looking good
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_shadow_
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« Reply #7 on: February 10, 2018, 10:05:25 PM »

Thats a neat little set up Shaddow, end very light.
How ready made do you buy that setup?
Id love to dabble in that sort of thing but need to do some diligence first

Looking good

Got the motor/gearbox combo from Hobbyking, it's the GPS-6. The caps are from eBay.

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OZPAF
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« Reply #8 on: February 11, 2018, 04:14:20 AM »

Very useful run time Shadow. I have seen a bit on Cap powered models - but your nice model has really caught my eye.

happy flying - don't forget a flight video.

regards
John
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outofbalance
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« Reply #9 on: February 12, 2018, 09:53:31 AM »

Hello Shadow,

Very nice set up! I can see this motor/assembly going into ten or 15 old rubber powered models that I have hanging in my basement ceiling with minor damage- gathering dust. I could re-engineer them for this kind of power. These models are mostly indoor flyers. Any more descriptive information (weights, run time, etc.) would be appreciated. Will this motor turn a foam cup engineered prop, six to eight inches diameter set to 35-45 degree pitch?

This might be a lot of fun.

Thanks in advance,

Outofbalance
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_shadow_
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« Reply #10 on: February 14, 2018, 06:35:38 AM »

Oob,

Weight : Prop (4x2.5) GWS + motor + gearbox + mount = 7g
Thrust : 18g @4.2V (may have wrongly posted somewhere that its 25g) but could possibly get a bit more at a higher voltage
Run Time : initial test runs showed about 2mins but useable thrust diminishes from 30s onwards.

I dont think the motor/gear ratio can swing any larger prop without overloading itself.

Will report back with more meaning data later.

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lincoln
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« Reply #11 on: February 14, 2018, 03:34:37 PM »

If you compressed it radially, you could increase the capacitance and get a longer flight. ;-)


Nice. I like the way you have the capacitor where an IC motor's cylinder would be.  Put fins on it and paint it black?

Maybe if it needs the weight for balancing...was thinking of also installing bolt/bar for compression adjustment, diesel engine.

Regards
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« Reply #12 on: February 16, 2018, 09:24:08 PM »

Some progress...

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Re: Ms Jenny - Capacitor Power
Re: Ms Jenny - Capacitor Power
Re: Ms Jenny - Capacitor Power
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« Reply #13 on: February 18, 2018, 09:58:47 AM »

Completed at 16.5g.

Maiden next Friday, videos will follow.

Regards
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Re: Ms Jenny - Capacitor Power
Re: Ms Jenny - Capacitor Power
Re: Ms Jenny - Capacitor Power
Re: Ms Jenny - Capacitor Power
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OZPAF
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« Reply #14 on: February 19, 2018, 01:16:43 AM »

What fun! It looks great.

John
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« Reply #15 on: February 20, 2018, 11:01:52 AM »

Just a teaser...

https://youtu.be/FIbQmacQ9LI


Regards
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PETERRAKE
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« Reply #16 on: March 18, 2018, 06:01:43 PM »

This looked very promising at the start, was there a power problem?

Pete
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« Reply #17 on: April 13, 2018, 12:45:38 AM »

This looked very promising at the start, was there a power problem?

Pete

Power seems to be ok but i've thrust line issues which i need to solve. Have been distracted with other project but plan to sort this out soon.

The two things that concerns me are the shaft of motor system is soft that even the slightest bump bends it but it straightens out ok and the motor mounting is an issue as well.

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lincoln
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« Reply #18 on: April 13, 2018, 03:14:03 AM »

You could protect the shaft by making your prop out of thin plastic* or making it foldable, or making a version of the prop saver that many small electric RC models have, where the prop is retained by a rubber band. It looks like you might be able to press out the shaft and put in a stronger one. If you can't find music wire in the right diameter, maybe you can use carbon rod or special sizes of motor shaft. Maybe you can find a drill bit or drill rod in the appropriate size and cut it to length. Then there's hypodermic tubing....

I think if it was my gearbox, I'd try yanking the shaft, heating it up, and quenching it to see if that made it stronger. I'm assuming the motor shaft itself is ok. 


*PET from a soda bottle? The bigger ones are lighter, but you'd probably want to do something to camber it. Perhaps heat and pull over a form.
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_shadow_
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« Reply #19 on: April 14, 2018, 06:53:53 AM »

lincoln,

Thanks for the ideas on the shaft...i really need to move my a** to sort this ASAP.

Will keep HPA posted on this.

Regards
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PETERRAKE
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« Reply #20 on: April 16, 2018, 06:27:37 PM »

Yes, the shafts on some of those are very soft. I had exactly the same problem with the 7mm unit, a slight knock and you spend the next ten minutes trying to get it straight again.
I've been running a Vapor gearbox and cut down Vapor prop on the capacitor from a different toy plane. That seems to work pretty well in tests, but I have yet to build a model for it.

Pete
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« Reply #21 on: June 03, 2018, 11:21:07 AM »

Finally, a flight video, the quality could be improved.


https://youtu.be/NeDfpjyUlWQ

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« Reply #22 on: June 25, 2018, 07:35:53 AM »

A short video, better trim.

https://youtu.be/1DpeHDXjitk

Regards
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