Kora 15/14

[hung]

Hi Guys

My lepton is in need of a new motor as the hyperion decided to
unwind itself in mid air :(
and it is going to take a little while before a new one comes back from warranty

so

my question is this motor " KORA 15/14" the best one to use on a
4S setup with then standard 24T pinion

cheers
Hung

[avatar71]

my 15-14 should be in on tuesday! Readyheli to the rescue!!! I will let you know how it goes!

[hung]

sweet

eagerly awaiting the results

[husafreak]

My Kora 15-14 is coming from "Icare". it shipped today.

[prototype3a]

If I can get off work early enough to get to the post office before they close then I should be able to pick mine up. Although I'll be running mine on 5s.

[prototype3a]

Got my 15-14 installed today. Installs pretty nicely with a 3mm screw in each corner. I went with a 20T pinion. This was the first time in a while where I was actually scared of a heli. Need to tach it and see what kind of H/S I'm getting. I think my tail belt may be a bit too tight as I was getting a lot of tail vibration. I thought that maybe my gyro gain was too high but at 20% it was still shaking. Took pictures of all three of the motors (Hacker, Hyperion, Kora) and I'll try to post them saturday

[avatar71]

where did you get your pinion? and please post your h/s when convenient. thanks.

[hung]

Got my 15-14 installed today. Installs pretty nicely with a 3mm screw in each corner. I went with a 20T pinion.

with the KV rating of that motor wouldn't it be better to use a 22t ot 23t pinion

[prototype3a]

If my numbers are right, on 5S a 20T should give me a max h/s of ~3050rpm. The 20T came with my heli (used). I believe the previous owner got it from Kovi. I honestly don't know what the proper pinion is on 5S but of my choices (26,24,20,19) I figured the 20 should be the closest. I may need a 21T but I'm sure the 20T will do fine until they're available. :hug:

I just realized that I should check my pinion mesh too. I used the plastic bag trick but I wonder if the screws and slots prevented me from getting the pinion close enough to the main gear. Suppose I'll have to check that out too tomorrow morning when I get home from work.

[prototype3a]

Here are the promised pictures comparing the popular motors. I was surprised that the Kora is a grey/black not the green as they appear on readyheli. I'm not complaining though as I wasn't looking forward to having a green motor.

[clever]

I honestly don't know what the proper pinion is on 5S but of my choices (26,24,20,19) I figured the 20 should be the closest. I may need a 21T but I'm sure the 20T will do fine until they're available.

Im running the 15-14 on 5s with 20t pinion. Everything stays cool and happy with my setup.

[prototype3a]

On the 20T with 5S I got 2880 rpm at 100% using the Jazz 80 in heli mode. With +/- 11 degrees of collective pitch this thing moves fast. I actually had a bit of a hard time trying to keep it at one altitude. Quick doesn't even seem to begin to describe this bird. Although you'll have to keep in mind I was having to fly the tail since my gyro still isn't setup. I need to make a new tail control rod with more adjustment to get this tail setup. Hopefully the weather will cooperate and I'll get it dialed in tomorrow.

[prototype3a]

Got the tail setup and the bird trimmed and I'm very happy with this motor on 5s/20T @95% on Jazz with +/-10.5 degrees of collective. This thing makes my trex seem slow.

[clever]

Any idea what your headspeed was while running 95%?