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Hobbistar 60 - Tail dragger conversion

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Old 11-11-2012 | 06:52 PM
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Default Hobbistar 60 - Tail dragger conversion

Now that the wing repair is complete, I'm turning my attention to the next project for this plane - converting it from conventional tricycle gear into a tail dragger.

The first step was to remove all of the stock landing gear.





Old 11-11-2012 | 07:01 PM
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Default RE: Hobbistar 60 - Tail dragger conversion

Next step: Filling in the main gear channel with some scrap.



I went with a Sullivan tail wheel. The original idea was to have it castering, but a closer look at the tail presented a different solution - taking a notch out of the elevator.

The notch was centred, but the stripes weren't.



Re-covered...

Old 11-11-2012 | 07:08 PM
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Default RE: Hobbistar 60 - Tail dragger conversion

After the notch was cut and covered, I ground off the heads of the plastic tail bolts, possible because the horizontal and vertical stabilizers are epoxied in place. Once that was done, I re-covered the tail.



The tail wheel bracket was mounted with four servo screws...



... and the steering arm was connected to the rudder.

Old 11-12-2012 | 05:11 PM
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Default RE: Hobbistar 60 - Tail dragger conversion

Cool, Idid the same with my Tower Trainer 40 but left the tailwheel to caster , it worked OK for my flying field but your solution is quite elegant.
The plane flew a lot better as a taildragger but it still sucked and I am glad it finally crashed and burned.
Inow have a Nexstar and its much better, maybe Ican make it a taildragger too?

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Old 11-12-2012 | 07:16 PM
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Default RE: Hobbistar 60 - Tail dragger conversion

Jeffie, there's a guy named chuebner on RC Canada who has converted his NexStar - check out this post for pictures.
Old 11-13-2012 | 03:23 AM
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Default RE: Hobbistar 60 - Tail dragger conversion

On to the main gear. The first step was to decide on the orientation. I chose to have it sweep back.



There are calculations you can do to determine where the gear should go. After a lot of thought, research and advice I decided that placing the axles directly beneath the leading edge (in a level attitude) was the solution for me. To that end, I followed these steps.
[*]Eyeball the placement of the gear on the fuse[*]Mark the leading edge of the gear on one side of the bottom, 5mm from the edge[*]Insert a t-pin at the mark[*]Roughly across the bottom from the t-pin, make a short line parallel to the edge and 5mm from it[*]Pick a forward point on the fuse. Measure halfway across the bottom and insert the t-pin there[*]Measure the distance between the two t-pins[*]Mark the same distance from the forward -pin to where it intersects the 5mm line drawn in step 4.[*]Insert a third t-pin at the mark[*]The line between the two rearmost t-pins forms an accurate leading edge location for the gear



Old 11-13-2012 | 03:28 AM
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Default RE: Hobbistar 60 - Tail dragger conversion

With the leading and trailing edges of the gear marked, the covering came off the bottom.



There was a small gap at one point where a razor blade could be worked in...



... but first the bottom had to be cut across. A fine-toothed back saw worked well.

Old 11-13-2012 | 03:34 AM
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Default RE: Hobbistar 60 - Tail dragger conversion

With the crosscuts done, a razor blade fit nicely into the gap.



A small scraper soon followed.



With some gentle encouragement, the bottom plate came off the fuse with little damage.



Turns out I had a hardwood block that was the perfect depth and width - it just had to be cut to length.

Old 11-13-2012 | 03:45 AM
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Default RE: Hobbistar 60 - Tail dragger conversion

I used 30 minute epoxy to secure the block.



While it was curing, I turned my attention to the gear itself. Drilled out the axle holes...



... test fit the axles...



... and marked the centre line.

Old 11-14-2012 | 06:28 PM
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Default RE: Hobbistar 60 - Tail dragger conversion

I put the tail wheel on before work this morning - couldn't wait to see how it looked.



I made a drilling template for the main gear based on the location of the hardwood block.





Got the holes marked and ready for drilling.

Old 11-14-2012 | 06:43 PM
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Default RE: Hobbistar 60 - Tail dragger conversion

With the holes marked it was time to lug my trusty drill press to the bench.



A little protection...



Started with the pilot holes.



Then to an 11/64" bit for the #8 wood screws.

Old 11-14-2012 | 06:48 PM
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Default RE: Hobbistar 60 - Tail dragger conversion

Time for one of my favourite tools - the transfer punch.



Holes marked.



Started with a pin vise...



... finished with a hand drill and 3/32" bit, marked with tape for a 1/2" depth.

Old 11-14-2012 | 06:53 PM
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Default RE: Hobbistar 60 - Tail dragger conversion

For#8 wood screws I'm not sure it's necessary to pre-thread the holes and drizzle in some CA, but I've gotten into the habit with RC so I went ahead.



After that came the covering, then the main gear.



I cut some brass tubing to bridge the gap between axle size and wheel bore.



Then onto its new legs for the first time!

Old 11-14-2012 | 09:37 PM
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Default RE: Hobbistar 60 - Tail dragger conversion

Irun a lot of four strokes and having the improved ground clearance to swing a big prop is important to me. Ialso fly off tall grass sometimes and it makes a big difference with a tail dragger.
Old 11-15-2012 | 03:09 AM
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Default RE: Hobbistar 60 - Tail dragger conversion


ORIGINAL: jeffie8696

I run a lot of four strokes and having the improved ground clearance to swing a big prop is important to me. I also fly off tall grass sometimes and it makes a big difference with a tail dragger.
I hear you. This plane is powered by an OS 65 LA 2-stroke running a 12 x 6 prop, but I whacked the grass with it plenty of times while I was learning on it with trike gear. Had to replace the nose gear a couple of times too.
Old 11-15-2012 | 08:28 AM
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Default RE: Hobbistar 60 - Tail dragger conversion

Ijust hate it when my plane turns green from mowing the grass with the prop.
Old 11-17-2012 | 08:38 PM
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Default RE: Hobbistar 60 - Tail dragger conversion

Together again for the first time.



Just a little nose heavy at the rearmost point of the CG range.

Old 11-18-2012 | 06:54 AM
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Default RE: Hobbistar 60 - Tail dragger conversion

Looks great, hope it flies as well as it looks.

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