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Dec 01, 2012, 10:50 PM
Registered User
grog85361's Avatar
Question

Folding prop suppliers


Where are you getting folding props? Tower Hobbies and Hobby Lobby are next to useless for this item.
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Dec 01, 2012, 10:53 PM
Paul Naton's Avatar
Esprit Model Soaring USA Atlanta Hobby
Dec 01, 2012, 11:09 PM
KC
KC
Registered Loiterer.
KC's Avatar
Aircraft World.

http://www.aircraft-world.com/shopdi...=folding+props
Dec 01, 2012, 11:13 PM
Registered User
grog85361's Avatar
Thanks! Looks like Esprit has what I want!
Dec 03, 2012, 12:44 AM
Registered User
hobby king has folding props also. i haven't tried any yet.
Dec 03, 2012, 01:16 PM
Registered User
pilotpete2's Avatar
Fugedaboudit
https://www.rcgroups.com/forums/show....php?t=1779139
Pete
Dec 03, 2012, 04:41 PM
Registered User
I'm not quite ready to throw the baby out with the bathwater, Pete. The TGS 11X6 is flat out dangerous but I have not seen similar concerns about HobbyKing props from other suppliers. I have three of these other props and, aside from a few more precautions, I don't see any compelling reason to toss them out. Yet.

I think there are still times that a budget prop from HK might be the way to go especially if it's one that comes with a spinner at a fraction of the price for a big name brand. The reason why I went with them to start is that I'm still learning about modern electric motors and needed a selection to figure out how said motors perform without risking too much of my fixed income on expensive blades I might not be able to use. Like most products from HK, you will probably get good value with items that receive good reviews and those with bad reviews should be avoided. I don't know why I neglected to check the reviews on the TGS 11X6 but I did and learned a valuable lesson without, thankfully, hurting myself or anyone else.

Now I just wish that I would receive a reply from their customer service regarding removing the faulty props from inventory. There's just no excuse for selling a dangerous product when at least one customer has contacted them about the problem and several others have suffered from the same problem. The longer they are offered for sale the less likely I am to order anything from HK.

All that being said; any propeller is potentially dangerous and it's probably best to stick with name brands. But even name brand props can suffer from the occasional manufacturing defect and one should follow all reasonable precautions. I should receive my new Aeronaut blades from Esprit Models in the next couple days and, now that I know how my motors perform, I probably won't risk a cheap prop until and unless I move to a different class of motor. And I won't be performing the first test run in my living room!

Cheers!
Dec 03, 2012, 04:55 PM
Registered User
Mark Miller's Avatar
I can get Graupner props
Dec 04, 2012, 09:15 AM
Registered User
Soaring USA
http://www.soaringusa.com/
has carbon fiber blades. They are rather pricey but they are really good! Click on the 'Electric Accessories' tab.
Dec 04, 2012, 10:06 AM
ground penetration specialist
Nathan Schmoekel's Avatar
Thought one:
For testing purposes a selection of non folding props can get you in the ballpark for not a lot of money.



Thought two:
ArtHobby.com supplies sailplanes in most size categories and they offer power system suggestions for each plane. By comparing the size and weight of your plane to something they make you can confidently select a prop and motor that will function well together. You can even compare your motor specs with the ones they supply and narrow the prop selections that way.
Dec 04, 2012, 10:09 AM
Bro
Bro
Registered User
Bro's Avatar

Carbon Blades


Howdy,
When it comes to props...
You get what you pay for in quality, and performance.

Best,
Bob
Latest blog entry: 2015
Dec 04, 2012, 11:21 AM
Flying = Falling (Slowly)
dharban's Avatar
I have done a fair amount of motor and prop testing and would advise guys to take the time to find out what speeds their propellers are rated to. It can be a hassle. Aeronaut publishes their max speeds. RF does not but Rudy will respond to specific inquiries promptly. I do not have any experience with Graupner or any of the other brands.

GUYS, THIS IS A BIG DEAL. I blew up a new Aeronaut on the test bench and imbedded a blade into the solid core wooden door that I used for a bench top. I was not exceeding the rating of the propeller, but It was mounted on a Vladimir's offset hub. I really like these hubs because they are tough and they do a better job of streamlining the folded propeller. But it turns out that offset (not twisted) hubs like this require that you derate the maximum blade speed by 25 percent. The take away here is not so much about the hub as it is that there is not a lot of "overhead" in Aeronauts ratings. If you are flying close to the rating (and I suspect many are) you are probably pressing your luck. If you are exceeding their ratings, you are looking for real dangerous trouble.

My "go to" props are RF's. The ones that I have used are rated substantially higher than comparable sized Aeronauts.

As for cheap props. When you dig a propeller blade out of a solid core door, you come to appreciate what might happen to yourself or a flying buddy who does not have a solid core skull. Saving a little money on a cheap propeller or on a less expensive propeller which is not rated for your application is just plain stupid.

Happy Landings,

Don
Dec 04, 2012, 11:41 AM
Registered User
pilotpete2's Avatar
I've never had a prop fail, and hope I never have it happen to me.
Thank you for posting your experience.
Pete
Dec 04, 2012, 02:56 PM
Registered User
Essex BOF's Avatar
Quote:
Originally Posted by dharban
I have done a fair amount of motor and prop testing and would advise guys to take the time to find out what speeds their propellers are rated to. It can be a hassle. Aeronaut publishes their max speeds. RF does not but Rudy will respond to specific inquiries promptly. I do not have any experience with Graupner or any of the other brands.

GUYS, THIS IS A BIG DEAL. I blew up a new Aeronaut on the test bench and imbedded a blade into the solid core wooden door that I used for a bench top. I was not exceeding the rating of the propeller, but It was mounted on a Vladimir's offset hub. I really like these hubs because they are tough and they do a better job of streamlining the folded propeller. But it turns out that offset (not twisted) hubs like this require that you derate the maximum blade speed by 25 percent. The take away here is not so much about the hub as it is that there is not a lot of "overhead" in Aeronauts ratings. If you are flying close to the rating (and I suspect many are) you are probably pressing your luck. If you are exceeding their ratings, you are looking for real dangerous trouble.

My "go to" props are RF's. The ones that I have used are rated substantially higher than comparable sized Aeronauts.

As for cheap props. When you dig a propeller blade out of a solid core door, you come to appreciate what might happen to yourself or a flying buddy who does not have a solid core skull. Saving a little money on a cheap propeller or on a less expensive propeller which is not rated for your application is just plain stupid.

Happy Landings,

Don
Do check out what RPM you are going to be turning, in relation to the prop being used. I had a nasty last year which proved expensive. I would now only use RFM or Graupner CFK props that are made from carbon cloth. This is even more so nowadays as people move from geared motors to outrunners that turn faster in regards to prop speeds and give out more power.
See attached picture This was an Aeronaut 15X8, tore the shaft out of the motor which fell away, leaving the rotating case in model but this revolved round in the fuselage and switched the U Bec off


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