Hangar dolly for heavy glider

On 2013-03-03, wrote:
This is an early video ...

Neat!

... One small tank of Nitrogen ...

So I ignorantly (and off-topic) ask, why nitrogen? Why not air,
which is 80% nitrogen anyway?



--

Rob Brown

I chose nitrogen because I had the bottle and a CGA 580 fitting sitting in the corner of the garage...

I've recently finished a new ro-ro design which lets me pull the glider onto the dolly and then pull off the dolly while it's connected to my tow bar. I'll try to add a picture soon.

So I ignorantly (and off-topic) ask, why nitrogen? Why not air,

which is 80% nitrogen anyway?


Because Nitrogen requires fancy green caps and an extra charge to fill the tires

A joke btw

About the automotive units in general and Harbor Freight cheapie unit
in particular. http://www.harborfreight.com/1250-lb...lly-67287.html

I looked at the HF unit and here are some comments;

1) It can be adjusted fore/aft for some pretty small tires including
the common 350x135 glider tires. I don't think that it will "pinch"
tires (as mentioned by Dave Springford). YMMV.
2) If the width needs to be narrowed, the HF unit could "easily" be
changed (cough...with a hacksaw and muscle). However, the wider
stance may be good for stability and dealing with #3.
3) The jack handle may need to be bent or adjusted to get out of the
way of the fuselage (as Steve Leonard mentions) while still retain
functionally. The other brands mentioned above tilt the entire lift
mechanism, not just bend the handle. This may be the trickiest thing
to correct but may be unneeded due to #2.
4) Sure is cheaper than the alternatives! Allows for low cost
experimentation!

- John

On Wednesday, May 29, 2013 9:47:00 AM UTC-6, JohnDeRosa wrote:
About the automotive units in general and Harbor Freight cheapie unit

in particular. http://www.harborfreight.com/1250-lb...lly-67287.html



I looked at the HF unit and here are some comments;



1) It can be adjusted fore/aft for some pretty small tires including

the common 350x135 glider tires. I don't think that it will "pinch"

tires (as mentioned by Dave Springford). YMMV.

2) If the width needs to be narrowed, the HF unit could "easily" be

changed (cough...with a hacksaw and muscle). However, the wider

stance may be good for stability and dealing with #3.

3) The jack handle may need to be bent or adjusted to get out of the

way of the fuselage (as Steve Leonard mentions) while still retain

functionally. The other brands mentioned above tilt the entire lift

mechanism, not just bend the handle. This may be the trickiest thing

to correct but may be unneeded due to #2.

4) Sure is cheaper than the alternatives! Allows for low cost

experimentation!



- John

The Gojack or this one will probably work - with modifications. However, there's an opportunity to do better by using the jack-able fuselage trailer dollies used with some fixed-gear twins as a model. By lifting the fuselage instead of the wheel, the tire and gear doors are accessable for maintenance