I am looking at this motor for some new projects and saw something that was very interesting.Does HK have kits so the builder could put together a micro extra 300? It looks like it would be a very fun build and this motor looks like a great match.
larry, I have not seen a kit, but I had a PDF of one I designed until I accidentally reformatted my external hard drive. I can retrace the template I made and post it if you like? It is a little of a beast to handle but lots of fun. You need lots of expo just to keep it from twitching! Happy flying!
larry, I found an extra 300 profile views by doing an image search. All I did was print it on graph paper and scale it to my full size 300 (39in wingspan) and to this one (16in wingspan). This ran on a 2S lipo, a Red Brick 10A ESC, the Orange 415 micro RX, 3 HK-5320 Ultra-Micro Digital Servos, and a 5x3 prop. The only thing I changed when making my template was widening the horizontal fuse just before the tail section. I will trace it again and make another PDF. My micro Extra 300 is beat up pretty badly and I've been wanting to rebuild it. Ha ha! Happy flying!
I bought this engine twice !It was propelling a scratch built bi-plane I had designed ( pictures ) And the two ones failed after one flight = wire broken inside the engine coils. Impossible to men.
DON'T BUY THIS ONE !
I am using this motor, C10-2900Kv on a "Pusher" inboard with a GWS 6/3 prop and noticed that the motor gets pretty hot.. Rqn it for approximately 2 to 3 minutes, on the bench, in the plane... 2C 370mAh lipo, 10amp ESC.... Should I change to a 5/3 or am I missing something here?? The plane is the IMP, one that was designed for Combat flying... Would appreciate an answer as our next indoor is Friday night and I don't want to cook my stuff... Art Lane, London Ont. Canada.
i whacked it with a hammer (no, really !) - the shaft will slips required as long as you support the rest of the motor on the mount over an appropriately sized hole
be gentle and it works fine - rustic but effective :)
I have just received this unit, but need to front mount.
It has arrived setup for rear mounting.
Would like to know the correct approach before leaping in and dismantling it.
No instructions or pics, just in a plastic bag.
Not exactly sure what you mean, but the wires are bare on the ends and you will have to put connectors on them. I used servo connectors so if the motor wasn't spinning in the correct direction, All I had to do was take the plug out and flip it to make it spin in the correct direction.
Race, Yes it does. It's in the photo on the back of the motor. Loosen the set screw and it will come off to mount where you want it. You may want to drill the holes out a little so you can use screws that are easy to obtain. I used screws that were designed for sub-micro servos because they were the only ones that would fit. Hope this helps and Happy flying!
coomic, correct, but if someone puts a larger ESC on, some may try larger props. Also, a larger ESC adds weight that isn't needed by such a small motor. Just trying to keep everything in perspective.. Ha ha! Take care.
Commander, No, I was using JR servo end connectors. They work great with these little motors. That way, if it is turning in the wrong direction, all that must be done is take the plug out and flip it over.
Sorry but I'm afraid it will burn after a few seconds but maybe its 5A esc will burn first! these tiny outrunners are outstanding but designed for 2s lipo and 4025 props or slightly above. For a fistful of GR more, the 11gr Turnigy 1811 Brushless will support a 6030 prop on 3s...Chris
It could be used with 1S. Remember a 2900 Kv motor on 1S will turn the same speed as a 1450 Kv motor on 2S. So you will need to use a larger prop. I would say start with a 5x3 and you could probably go to a 6X3 or 6X4 if needed.
Thanks, I know that with a 1S (3.7v) it should turn the shaft at (2900 x 3.7) 10,730, which should be fine for what I intend... a micro Extra 300 plane. I just didn't know if it would function under 7.4v.
Hey, I just got this mounted to a small 3mm depron foamy I built. I'm using the Orange Spectrum micro receiver with the Hobby King XP 3A 1S ESC and 3 micro linear servos. I put a GWS 5x4 prop on it and spun it up to see how it pulled. I will pull it's weight vertical with a 1S 25c 350Mah battery. Now to get it in the air and get some video.
Well Ladies and Gentlemen! I built a micro Extra 300 with 3mm depron and used a 4x3 prop powered by a 1S 350mAh battery and it will hover and pull out. I was very impressed with this motor's capabilities. The plane is a little nose heavy with the prop adapter, but I'm ordering prop savers that will lighten it up considerably.
I can scan what I used. I only printed out a real Extra 300 on graph paper and then played connect the dots. Each square is 1/4" on the graph paper and I used it to scale up to my full 6mm depron size (39 1/2"). It flies like a dream and the small one flew well too... until it crashed. LOL.
What is span of this one "micro Extra 300 with 3mm depron and used a 4x3 prop powered by a 1S 350mAh battery and it will hover and pull out." Also interested in howand where the gear was mounted and where carbon or wood dowel were used.
Can you post a link to the receiver and servos used?
The wing span is 16" and the attached pdf if printed on graph paper is what I use to scale the foamy to. The red on this drawing are the modifications I added for strength, to protect the rudder, and to see some lines that were not very clear in the drawing I used. The CG is perfect on all models if set at 7/24 back from the leading edge of the wing. Set all control surfaces flat and it will be very easy to trim. Hope this helps
The receiver is the Orange spectrum micro 4ch. The servos kinda sucked so I'm getting the little HK-5320 micro servos to replace them. Also, I ordered some 2mm prop savers. These should be much lighter than the prop adapter I have on it (too heavy). For placement, I put the battery where I wanted it and checked to see where I could place servos, RX, and ESC using scotch tape to hold in place temporarily until I mounted them solid. After I rebuild it (when my local store gets more 3mm) I will upload some pics to show. The new servos should work much better I'm hoping. If you want to see one of my projects, go to YouTube and look up ron lampman and stopsign. Pretty funny. Take care brother.
Look forward to your pictures. I purchased some of the 1.7 g HK single chip digital servos but was suprised to learn the connectors do not fit the ones on my Assan micro receiver. They are both small and white but the pin spaceing is just enough different that they are not interchangeable....***mer. I ordered one of the Orange receivers with small white connectors. I hope those match up to the new servos. I have a good supply of very light weight 2mm prop savers. If you can get me a shipping address I'll send you a couple.
Thanks but I just ordered a bunch. I did order the male and female connectors for the Orange micro RX. I had to use one for the ESC only. Just found out my local hobby store will not be getting more 3mm depron until after the new year. Oh well...
I did a template of the micro Extra 300. When I printed it out, it was slightly smaller than the original, but not that much and it was proportional to the rest of the pdf. Interested? If so, write a question about it and I will answer with it.
You need to give more info, this motor will most likely be too big for some micro models, you also need to look at the voltage, most micro run on signal cell batteries - I would be looking at A05 motors or 3.1gm motor designed to run on signal cell before using the C10.
no rating yet. How to fix props with small holes to this motor? I cannot find propsaver for 4mm shafs, and fxed adapters have too big screws, 6-8mm (props have 3mm holes). what to do? Just use 2 nuts from hardware store?
I lost one of the mounting screws that goes into the back of the motor (one that came with it). Can someone tell me the size of the screws that fit into the holes in the back of the motor so I can get a replacement?
If you have a harbor freight in your area, they have a box of assorted set screws. one should be the right size. If not, try an automotive parts store, they may have it and if not they might be able to tell you the size and thread count of the missing set screw. Hope this helps!
ordered plane last night can't wait to get my hands 0n that little focker(ha ha). if plane is tail heavy why not mount motor on the front of the firewall? the C 10 that HK sells is shown with a x type rear mount. is C10 shaft reversable? will order hotter motor with rear mount and see what happens.
It looks like a 3S with a 4025 prop is doable. That's very close to the max limit of 5A though. It seems like it is even slightly over-amped at WOT so I wouldn't go WOT with it at all. Maybe set the Tx to limit the throttle at 95 if you can.
I would like to know as well actually. The shaft sticking out the front of the motor is actually quite short, and I think you would need a shaft adapter to mount a decent prop on this thing. The motor is equivalent to what is in the "mini swift" glider, but the prop for that wont fit this motor since the shaft is way shorter than what is in the motor of the "mini swift".
I took a prop saver from a Turnigy T1400 Brushless Indoor Motor 3000kv and drilled out the hole to fit. Works great. Now if I could just find more of the same prop savers like came with T1400 I would be happy.
this thing will haul the mail! 4.8 oz thrust on 2c with a dd 5-3 (cut down from 6-3) video is a 3.7 oz plane with this motor, 6 amp turnigy plush, 460 2c, 3.7 gram www.link
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13 thumbs up!
this little gem really likes the 4040 with 2s.. ~4oz thrust and some good speed, motor is just slightly warm after a flying a full battery (2s460mAh) at 80-100pcnt throttle. tach readings soon.
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10 thumbs up!
This motor works well with the Graupner 4,7"x2,3" CAM Folding Prop. Using a 2S HXT 350mAh LiPo and the Turnigy Plush 6A ESC it draws about 3,5 to 4 amps. I think its reliable vor models up to 120 grams.
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7 thumbs up!
I just got mine in and am beginning prop testing. prop saver and 2 bands included. the firewall mount is removable. some runout (wobble) on the bell on one of them.