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Hot Topic (More than 10 Replies) Rubber Loading Stick (Read 1628 times)
Sky9pilot
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Re: Rubber Loading Stick
Reply #11 - Jan 17th, 2020 at 10:12am
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It's the same principle as mounting the motor without the bobbin.  Bobbin and rubber motor are on the Loading Stick and the anchor is attached from the outside of the model through the bobbin/motor loop using the reinforced holes in the side of the fuselage/motor booms (P-38) depending on the aircraft with your anchor aluminum tube or bamboo skewer etc.
  

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Re: Rubber Loading Stick
Reply #10 - Jan 17th, 2020 at 10:06am
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Thanks, guys! I understand the idea. One other thought came to mind, and that is how to get the anchor peg into the model with the bobbin attached. Answer must be to hold the bobbin inside while pushing the anchor through it from outside.
  
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Re: Rubber Loading Stick
Reply #9 - Jan 16th, 2020 at 9:47pm
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Mike is absolutely correct.  One other thing the bobbin does is remove the natural tendency of the rubber to grab the motor anchor as Mike pointed out the bobbin eleminates this tendency.
  

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And ye shall know the truth, and the truth shall set you free. Jn 8:32
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MKelly
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Re: Rubber Loading Stick
Reply #8 - Jan 16th, 2020 at 7:45pm
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The bobbin at the rear peg lets the rubber move side to side and rotate a bit around the peg as it unwinds.  This helps prevent the rubber bunching up at the rear peg, allowing you to use longer motors giving more turns and longer motor run times.

There are several articles on this in the NFFS technical library - here's one:

https://freeflight.org/Library/TechLibrary/RubberMotorsVeryLong.pdf

Mike
  
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alfakilo
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Re: Rubber Loading Stick
Reply #7 - Jan 16th, 2020 at 5:55pm
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OK, so far, so good. I see how it is used but I still don't see why. What is the difference between the end of the motor looping around the bobbin as compared to looping around the aluminum anchor shaft?
  
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Sky9pilot
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Re: Rubber Loading Stick
Reply #6 - Jan 16th, 2020 at 10:04am
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The bobbin is fixed in the end of the motor with a small rubber band that tightens the end loop of the motor to the bobbin.  I'll look for a picture.
In these two pics you can see how smaller rubber bands are used to keep the loop in a braded motor and keep the bobbin in the loop.

Bobbins can be made from plastic straws where you hold the end of the straw near a candle flame or a lighter and allow the ends to curl back.  Below is a pic of the straw bobbins.
Sky9pilot
« Last Edit: Jan 17th, 2020 at 7:08pm by Sky9pilot »  

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If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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alfakilo
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Re: Rubber Loading Stick
Reply #5 - Jan 16th, 2020 at 9:37am
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How is the bobbin used?
  
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Sky9pilot
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Re: Rubber Loading Stick
Reply #4 - Dec 18th, 2019 at 6:16pm
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There you go, and not a bad price too!!! Thanks for the link! Smiley
Amazing what they're making with these
3D printers!
  

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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New Builder
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Re: Rubber Loading Stick
Reply #3 - Dec 18th, 2019 at 6:11am
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Volare products makes a 3D printed version of the stuffer end in two sizes. Add the stick and done.
Click here: https://volareproducts.com/index.php?main_page=index&cPath=112&zenid=883f5jkcd1g
59eskkq3ipu7lp7
Mike
« Last Edit: Dec 18th, 2019 at 7:23am by New Builder »  

"Skill comes by the constant repetition of familiar feats rather than by a few overbold attempts for which the performer is yet poorly prepared." Wilbur Wright
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Re: Rubber Loading Stick
Reply #2 - Dec 17th, 2019 at 6:31pm
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This is an easy to make tool to assist loading motors (even braided) into models.  If you make a long one of 1/4 dowel with 1/32" or 1/16" ply ends to hold a bobbin it can be used for loading even the smaller models.  Here's a picture to help in making your own motor loading stick!
I made this up before following my own advice and researching to see if someone else has already posted this info.  Thanks to cdwebb for his great pictures.  I will add this drawing to assist and hopefully not to take away from cdwebb's post!
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( 68 KB | 1 Download )
motor_loading_stick.jpg

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Sky9pilot
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Re: Rubber Loading Stick
Reply #1 - May 10th, 2016 at 6:33pm
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David...well done.  I've thought of doing this from time to time but never got around to it.  Thanks and great job. 
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If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Rubber Loading Stick
May 10th, 2016 at 6:04pm
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Not that elegant, but long overdue. I remember when this was all new, that my minute brain couldn't imagine how a rubber loading stick would be constructed. I thought that this might possibly give someone else an idea that I didn't have.

I took a break from the Aeolus to make this up last night. Made from a 3/8" hardwood dowel and 1/8" basswood. I sanded flat surfaces on the dowel opposite each other and the basswood forks (sanded to shape - edges rounded) were epoxied, then bound.

Pretty easy, but lots of sanding. It took a little less than 2 hours and was made from stuff leftover from past projects. It seems to be fine for anything down to around 24" models. For those, something a little smaller will have to be put together.
  

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