An excellent device for saving your propellers on those bumpy landings or dodgy take-offs. The prop saver has a 3mm size shaft, and comes with a collet to fit most propellers. it also has 3 rubber bands.
There are more dimensions than the shaft size. Would be interesting to know what they are.
(HK, why don't you show the dimensions and which metal they are made off? Also, I believe the screws are Philips, they should be hex.)
How long has it been on back order?
I'm new to planes, I've been a heli only guy for 3 years. I thought I might get a few of these for my mini and FMS 800mm warplanes, but I cant figure out how these work. Can someone quickly explain thanks?
You put the prop saver with screws to the motor shaft, then put the propeller with the prop saver rings. Thus, if the propeller hits the ground, you minimize damage to the propeller and the motor shaft. Choose the right prop for your engine saver (2mm, 3mm, 3.17mm, 4mm, etc ...). Luck!
you simply put the adapter on the motor's shaft, then you turn the screws so that it won't move away from the shaft. Then, you place the prop on this adapter and you "fix" it with a rubber ban (hold on the screws). Hope I helped you !
These work by holding the propeller onto the motor only with the rubber band. Thus when the prop hits the ground, the rubber band allows it to seperate from the motor and rotate until it's parallel with the ground. As you may have already understood it prevents the prop from bending and breaking by allowing it to rotate. Hope this helps.
Also, if you are having trouble fitting this on the motor shaft: I noticed that there is a bit of paint on the inside of these, making them more like 2.8-2.9mm = won't fit the motor shaft. I had to drill them out with a 3mm drill bit to make everything fit.
put the two screws in the prop saver. then slide it on the shaft. then add your prop sitting on top. now hook the rubber ring on one screw and pull it across the prop to the other screw and hook it on that screw. thats it your done . if you have a strong fast motor somtime you can put on two rubber rings to really hold your prop better. credit the best answers thanks ,tommy
Either the hole or the screw could have some metal protuberance that don't let it screw in, give both of them and if you find any file them down taking care not to damage the threads. Try to find similar screws and try screwing those in. Take the prop saver to a hardware store and try out diferent sizes of screws :P... Also, the screw might be the diameter, but the threads might be different. Good luck!
Be very careful about this problem. Using a different screw might lead to future problems for a number of reasons. You might accidentally cut a different thread which will not suit your supplied screws. Since the unit needs to balance on the shaft, you must use identical screws. A common solution is to remove some material from the leading threads of the screw which will then penetrate deeper into the hole before "biting". But if you do this, you will need to do the same to the other. Another solution is to screw in from the other end. That means from the shaft housing outwards. But this would require a grub screw and you might not be able to match the thread. If you have a set of taps or thread cleaners, you can pass one through to clean up the thread. Alternatively, you could tap new threads to match two new screws that you have in your spares. But this solution demands that you do have an engineering tapping set. It might be cheaper to purchase another.
you can go buy a metric fine tread tap and die from any hardware store fairly cheap then you can re tap the hole properly simply a 10 dollar kit.then youll have it to fix or create anyhole you ever need!
Yes, it will fit. But I had to take some fine sand paper to the shaft of my 3mm motor due to the snug fit of the prop saver. Also, I just bought some of these and the rubber bands kept snapping on me after simple s***ling up in the shop… I don’t care about saving props* I just wanted a shaft adaptor so I had to use small zip-ties to fasten my props to the screws.
Joe do you think larger is a good idea. I have been ably to drill them out on a good drill press. IE: 3mm to 1/8 inch. I will say a good drill and press is very important. As you can see from other replies you can lose center if you use a hand drill.
It depends on the propeller, i have a TGS Sport 8x6E which is too big for this prop saver. The O-ring must be placed with a small screw driver and it doesn't resist to the motor power.
Masterscrew propeller are easily to use with this prop saver.
Prop Saver is used if your motor doesnt have a threaded shaft . It will go on 2 ways depending on the hub size of your prop . Once you know which hub the prop will fit over face it outward slide it on the shaft and tighten the screws . Next the prop goes on and then the oring hooks around 1 of the screws around the front face of the prop and around the other screw . Its a fairly hard pull but very secure once on . I actually use 5/16 surgical tube cut into rings instead of the orings .
This kind of thing has happened to me, as well. The ETA indicates supply of, say, two weeks but the same message remains for many many weeks. For one item reported as ETA one month, I paid and waited six months before cancelling my order after CS informed me there was no likelihood of supply for another three months. I lost my postage.
I have written to HK Customer Services appealing for quality ETA information to enable improved customer ordering decisions. A quality customer service req
I wouldn't used it for such a large motor. When your motor produce high torque, the o-ring may snap. Propsaver is good thing on small models, where you may not have landing gear, or the plane is "crash resistant", it will reduce the cost of broken props(and motors)... On larger planes a crash is often more expensive than just the prop, so I'd rather not crash:)
good for 300 gramm foam plane, but make sure u use 2 bands.
12 thumbs up!
Like other reviewers, I am pleased with the machine work of this adapter. Fits the motor shaft well, and the ability to use it for 3 different prop hub sizes (5.5mm 7.0mm and 9.5mm) will save some reaming of props. Mine was in balance also, and runs true! I will be adding a handful more to my next order!
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5 thumbs up!
Great prop saver, much better than the cheaper ones UH sells.
This one actually fits props, go for this one instead.
5 out of 5.
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4 thumbs up!
Just received this recently and was disappointed to find out that the version I received was black in colour instead of blue(a minor thing)and it did NOT come with the pictured socket head screws.I got crappy phillips screws instead.I originally bought this version because it was suppose to come with socket head screws.Come on Hobby City.This is false advertising at its worst.