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Author Topic: What length for P30 motor winding tube...  (Read 299 times)
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PantherM100
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« on: March 22, 2021, 02:39:08 PM »

Hi Guys:
I am considering purchasing a motor winding Tube.
For winding the rubber motor outside the airplane.
So obviously the outside diameter needs to fit
Inside the fuselage (in the case a balsa tube).
But what about the length?  I think obviously the
Motor winding tube has to be somewhat longer
Than the distance from the motor peg to the
Nose opening, with the prop assembly and nose block. 
Are there any factors I’m missing?
The motor winding tube will be made from thin
Wall aluminum tubing.  Any suggestions are appreciated.
Sincerely,
Jon B. Shereshaw
NJ. USA
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FLYACE1946
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« Reply #1 on: March 22, 2021, 02:50:10 PM »

You need to remove the tube after the motor is wound. Just be sure the tube can be pulled out before installing the nose block. Maybe use a couple of inches longer than the total distance from nose area to motor peg. Good Luck and use a winding wire between the winder and the front hook that is attached to the motor.
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DerekMc
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« Reply #2 on: March 22, 2021, 05:10:22 PM »

The blast tube should be long enough to be easy to grasp when it's in the fuselage.  Mine stick out about 3/4".  I roughen the surface in some way so that's it's easy to grasp.  A strip of sandpaper glued where I want to grab it works great.
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Derek
NormF
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« Reply #3 on: March 22, 2021, 05:40:24 PM »

For P30, I use Lee’s rigid aquarium tubing. See: https://www.leesaqpet.com/index.php/results,1-60?keyword=Rigid+tubing&limitstart=0&option=com_virtuemart&view=category&virtuemart_category_id=0
The tubing comes in a variety of sizes. I use the largest that will easily fit. If you need more strength, wrap the tube with reinforced packing tape.
Notch the rear so it is a snug fit over the rear peg. This can also be a twist lock shape. This is to prevent the tube from backing out when stretching the motor. The overall length should be approx 1” longer than the motor tube (so you have something to grab).
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PantherM100
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« Reply #4 on: March 23, 2021, 11:53:15 PM »

Fly ace 1946:
Can you tell me the purpose and configuration of
The “Winding Wire” you describe in your post.
Thanks in advance.
By the way, the use of an external winding tube may not
Be intuitive for us newbies to P30 class.  It requires more than
A simple hardwood peg to make external winding a practical task.
Okay, I can remove the nose block and prop, if required, then
hook up the Rubber motor to the winding tube. Wind to hearts content.
Now here’s the trick...One inserts the retained and
Wound motor down the fuselage to a point where a
Temporary rod is inserted.  Okay, I got that. But there must
Be the permanent motor peg / tube inserted and the temporary
Rod / retainer is removed. And it must be held securely in place .
Perhaps a tubular part with an ample shoulder on one end and like
A miniature re usable (spring)!cotter pin and washer on the other.
Sorry to be so long winded.  Perhaps
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PantherM100
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« Reply #5 on: March 23, 2021, 11:57:07 PM »

...Continued from above....Are there any simple drawings
Or sketches.
Sincerely
Jon B. Shereshaw
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DerekMc
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« Reply #6 on: March 24, 2021, 12:23:18 AM »

I didn't realize you wanted to wind the motor outside the fuselage.  Most outside winding is done with a half tube system. Using a full tube is possible but more complicated.  I don't know of any that are designed for P30. They are used in Coupe and Wakefield.  There are people that make their own half tubes for p30.  I remember Tapio (who posts in this forum) did.  I'll try to find a picture or two.
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NormF
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« Reply #7 on: March 24, 2021, 12:27:57 AM »

Sorry, I went by the thread title and did not realize this was about external winding. A while ago there was a thread on external winding P30’s See: https://www.hippocketaeronautics.com/hpa_forum/index.php?topic=20134.msg197996#msg197996
You will still need an inch or so sticking out of the motor tube to extract the half tube.

Norm

Derek, you typed faster than me!
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DerekMc
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« Reply #8 on: March 24, 2021, 12:53:22 AM »

Sorry, I went by the thread title and did not realize this was about external winding. A while ago there was a thread on external winding P30’s See: https://www.hippocketaeronautics.com/hpa_forum/index.php?topic=20134.msg197996#msg197996
You will still need an inch or so sticking out of the motor tube to extract the half tube.

Norm

Derek, you typed faster than me!

I might have been faster but you had the links to address the question!
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Derek
Tapio Linkosalo
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« Reply #9 on: March 24, 2021, 07:01:35 AM »


Derek asked me to share my post from FB, so here goes. Quite some time ago I made a half-tube out of carbon to use with P-30, but my rear bobbins back then were of aluminum tubing and piano wire, and they were awkward to insert to the rear peg. So I discarded the project for some time. More recently I drew a new bobbin to be 3D-printed. This is round and close to the inner diameter of the motor tube, so it tracks better and thus is easy to insert and remove. It took a couple of iterations to add suitable flanges to the hooks, so that they are strong enough, but this seems to work. I have used them a couple of time, and they can handle the torque of fully wound 6 strand motor.

Next issue was holding the rear bobbin to the stooge. I had used my F1B stooge also for P-30, but this is too wide and the bobbin tends to slide to side, at an angle. Not neat. So the next project was to design and print a new stooge head. This has two holes for the retaining pin. The one to the rear holds the rear bobbin, close to the head bottom to hold the bobbin firmly. There is another hole, a bit higher up, and here is room for the whole model, in case I need to wind my motor inside the model.

Finally I had so solve how to keep the half-tube in place during winding. For this I got the idea to use magnets (one pair at the stooge head, another at the nose hanger). The half tube clicks positively to the magnets, but is easy enough to remove once the motor is wound.

I still consider making some king of front bearing / prop holder to the front of the half tube. Currently I need to hold the motor in half-tube by hand. That is quite OK, but if for some reason I would need to work something with both hands while the motor is would, it would be neat to be able to lock the wound motor to the half tube.

Having finished the rear bobbin design, I got a bit carried away with printing them... Grin

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FLYACE1946
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« Reply #10 on: March 29, 2021, 12:00:13 PM »

I use a winding wire to make the blast tube slide in and out easier. That means I can have it ready when I need to remove the tube and I don't have to find a place to keep the wire until its time to remove the tube. Hope this helps.
Fly ace 1946:
Can you tell me the purpose and configuration of
The “Winding Wire” you describe in your post.
Thanks in advance.
By the way, the use of an external winding tube may not
Be intuitive for us newbies to P30 class.  It requires more than
A simple hardwood peg to make external winding a practical task.
Okay, I can remove the nose block and prop, if required, then
hook up the Rubber motor to the winding tube. Wind to hearts content.
Now here’s the trick...One inserts the retained and
Wound motor down the fuselage to a point where a
Temporary rod is inserted.  Okay, I got that. But there must
Be the permanent motor peg / tube inserted and the temporary
Rod / retainer is removed. And it must be held securely in place .
Perhaps a tubular part with an ample shoulder on one end and like
A miniature re usable (spring)!cotter pin and washer on the other.
Sorry to be so long winded.  Perhaps
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