Remote Control Aircraft Tug (split from Hangar Math)

[johneeb]

Or get one of these and in no time your body will look just like mine

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[W.J.Langholz]

OK John.....give it up, where do I find one and how much?


W.

[Kyle Wolfe]

Dubya, all you've got to do is get your son John to build you one. He's an engineering student! Heck - it should be free after you've probably helped pay for that college education!

As I recall, Joneeb built that himself.

http://www.cessna170.org/forums/viewtop ... 860#p77860

[johneeb]

OK John.....give it up, where do I find one and how much?


W.

Willie you start with two of these and plagiarize the engineering from my photos. If you do want to build one ask me to explain the bucket geometry, you have to offset the pivot point.

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[canav8]

OK John.....give it up, where do I find one and how much?


W.

Willie you start with two of these and plagiarize the engineering from my photos. If you do want to build one ask me to explain the bucket geometry, you have to offset the pivot point.

scwinn scooter.jpg

John, Im interested. Please explain the bucket geometry. The batteries lay flat in the tool box?
Doug

[johneeb]

Doug, the batteries do lay flat however they are sunken into the frame below the tool box (which has a false bottom to access the wiring under the servo panel).

The bucket geometry is odd in that the pivot bearing is not centered but raised 1/2" when the bucket is open thus allowing the bucket ramp run just barely above the ground and when the bucket is rotated closed the 1/2" offset allows the bucket to gain ground clearance as it is rotated closed. You cannot see the offset in the attached pictures and I should add that the hole in the frame that the axle bolt mounts on is actually a slot (also not visible) so that you can you can adjust the bucket height to find the sweet spot where the bucket will pick up the tail wheel.

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[canav8]

Very nice John. I do not wish to thread jack but I am intrigued by the R/C Dolly. Moderators wish to make this its own thread? Bruce?George?
John, can you explain the planetary drive?

[johneeb]

Doug,
One important part of making this tug work was adjusting the ratio between the wheel and the electric motor, stock is to fast. First I tried buying the smallest motor sprocket (fewest teeth)I could find and the cart was still way to fast. So than I found I could buy a planetary reduction gear that worked perfectly, you can buy the planetary from several places I used the Superkids supplier. When you see how the original motor is mounted to the torque plate (my description) and then look at the attached picture you will see I had to space the motor over approximately 1" and add an end bearing plate to house the planetary and the smaller sprockets axle. This plate believe it or not came from a towel bar mounting plate, worked great as it was the correct diameter and had the center already located.


http://www.thesuperkids.com/plge19tofrsp.html

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[canav8]

Johneb, The planetary set link you posted is for a freewheel planetary set. How does it reverse direction? Doug

[johneeb]

Johneb, The planetary set link you posted is for a freewheel planetary set. How does it reverse direction? Doug

Good catch Doug! As I recall now (cannot look today I will next time I am at the airport) the sprocket that comes with the planetary set has an internal overriding roller clutch, when I fitted the smaller sprocket it did not have a clutch and I believe I drilled the shaft and sprocket and used a small roll pin to secure the sprocket to the axle. Pictures later!

[canav8]

Thanks for doing that John. One more question. Is there a Brake? or is the friction sufficient when un powering the motor through the planetary set? Thanks.

[blueldr]

My hangar also had a very slight uphill pull to get the airplane back into the hangar. I hired a "Hooters" girl to do the job, but the crowd that gathered every time I taxied in became too big so I bought a small winch from Harbor Freight to attach to the back hangar wall. Essentially, I went from wench to winch.

(That's a good one, huh George?)

[canav8]

My hangar also had a very slight uphill pull to get the airplane back into the hangar. I hired a "Hooters" girl to do the job, but the crowd that gathered every time I taxied in became too big so I bought a small winch from Harbor Freight to attach to the back hangar wall. Essentially, I went from wench to winch.

(That's a good one, huh George?)

LOL, Dick, unfortunately you are not an entrepreneur. Had you seen the gathering, you would have charged admission. There by coaxing the Hooters girl to stay and you would have got your airplane in your hangar and maybe even a car wash. Oh well at least the winch doesnt complain when you ignore it.

[170C]

I suspect that Dick did an exhaustive study on the merits of charging the assembled crowd an admission and all the other aspects of the Hooter's girl and came to the realization that the mechanical winch was, by far, the least expensive option

Keep em coming Dick

[GAHorn]

A Hooters Wench?