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Author Topic: Prop saver hubs?  (Read 1517 times)

Offline Larry Renger

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Prop saver hubs?
« on: June 01, 2012, 10:14:48 PM »
I am building several new ELECTRIC trainers to replace our club's aging and PITA PT-19 fleet. The old fuel trainers need a squadron of trained seals to operate.  The electrics will be OH SO MUCH SIMPLER! (external R/C throttle to give only 10 laps per kid, several flights per battery pack, etc.) (More on the design as it develops, prototype 60% done)

The hobby shops in this region never heard of a prop-saver hub.  I have one on a (gasp) little R/C model, so they DO exist.

Anyone recommend a source for them for a 3mm shaft and APC 7x5 e-prop?

I can make my own if I really must, but what a pain!  HB~>
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Think S.M.A.L.L. y'all and, it's all good, CL, FF and RC!

DesignMan
 BTW, Dracula Sucks!  A closed mouth gathers no feet!

Offline Tim Wescott

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Re: Prop saver hubs?
« Reply #1 on: June 01, 2012, 10:20:15 PM »
Well, the most obvious place to look would be Tower Hobbies:

http://www3.towerhobbies.com/cgi-bin/WTI0095P?FVSEARCH=prop+saver&search=Go

but Hobby Lobby comes to mind:

http://search2.hobby-lobby.com/psearch/svc/search.php?uid=2&q=prop+saver&x=0&y=0

There are others, but those two had search functions...
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AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline jfv

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Re: Prop saver hubs?
« Reply #2 on: June 01, 2012, 11:03:56 PM »
You might want to try on of the smaller Rim Fire motors.  They have a prop saver built in.

http://www.electrifly.com/motors/gpmg4505.html
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Jim Vigani

Offline Dennis Adamisin

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Re: Prop saver hubs?
« Reply #3 on: June 02, 2012, 12:16:40 AM »
Brodak's Arrowind 2205 & 2210 motors come with prop saver hubs.  Brodak also has the Arrowind 3mm prop saver hub available separately.  It is double sided with a slightly different size centering cone on either side.

 
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Denny Adamisin
Fort Wayne, IN

As I've grown older, I've learned that pleasing everyone is impossible, but pissing everyone off is a piece of cake!

Offline William DeMauro

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Re: Prop saver hubs?
« Reply #4 on: June 02, 2012, 04:46:51 AM »
Here are some bulk priced ones(10 for $3.74). http://www.lowpricerc.com/index.php/motor-accessory-c-10.  Make sure you mount the prop savers against the motor and cut off the excess shaft for maximum strength. A little loctite on the screws ans shaft keeps it from slipping on the shaft as the sometimes like to do.
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Offline Larry Renger

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Re: Prop saver hubs?
« Reply #5 on: June 04, 2012, 01:48:22 AM »
That was a great tip!  Thanks.   H^^
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Think S.M.A.L.L. y'all and, it's all good, CL, FF and RC!

DesignMan
 BTW, Dracula Sucks!  A closed mouth gathers no feet!

Offline Phil Krankowski

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Re: Prop saver hubs?
« Reply #6 on: September 12, 2012, 08:00:06 PM »
Check out rctimer.com it gets good reviews on RC sites, and I have ordered from them recently with good results.

Phil
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Offline Tim Wescott

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Re: Prop saver hubs?
« Reply #7 on: September 12, 2012, 09:33:28 PM »
A prop saver is a little gizmo that holds the propeller in alignment with the metal bits, but holds the prop on with rubber bands (or O-rings).  So when you have an unscheduled contact with the ground, you're less likely to break a prop (and, for that matter, bend a motor shaft).
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AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Will Davis

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Re: Prop saver hubs?
« Reply #8 on: September 13, 2012, 06:05:11 PM »
Try the stevensaero website they have all the stuff you need for a great trainer power package. We used the ring rat trainer at joe nall , simple timer to give 1 minute flight
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Will Davis
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Offline john vlna

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Re: Prop saver hubs?
« Reply #9 on: September 13, 2012, 07:05:57 PM »
Larry.
all you ever want to know on prop savers. http://www.rcgroups.com/forums/showthread.php?t=1419378
don't run to high an rpm they are not safe for hi reving motors, really they are for slow fliers .
john
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Offline Larry Renger

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Re: Prop saver hubs?
« Reply #10 on: September 14, 2012, 09:39:56 AM »
I am using them on motors running about 9500 rpm, but they are pusher configuration, so not likely to fly off.
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Think S.M.A.L.L. y'all and, it's all good, CL, FF and RC!

DesignMan
 BTW, Dracula Sucks!  A closed mouth gathers no feet!

Offline Tim Wescott

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Re: Prop saver hubs?
« Reply #11 on: September 14, 2012, 10:07:36 AM »
They'll still come off of a pusher.  We've got a member of our RC club that builds little F-15-ish jet models powered by way-fast pusher motors; the word on prop savers is "Oh god no, you don't want to do that!".  This is based, I gather, on real-world experience involving chewed-up foam.

OTOH, if you run the motor up to speed and flick the model 90 degrees in pitch and the prop doesn't come off, you're probably fine at that speed.  At least until the rubber band gets tired.
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AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Larry Renger

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Re: Prop saver hubs?
« Reply #12 on: September 15, 2012, 11:16:51 PM »
These are on trainers.  There is NO chance of a quick 90 degree change, even down.  There is a strong chance of a 45 deg, or greater, impact with the cement.  So far, we have been able to train for a full day with just one model (we have 4).  See my posts on the ET-1 trainer.  It WORKS!  :D
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Think S.M.A.L.L. y'all and, it's all good, CL, FF and RC!

DesignMan
 BTW, Dracula Sucks!  A closed mouth gathers no feet!

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