Building the "K-Quad"

[CurryKitten]

Cheers Brod - useful to know.  I got the link from them from someone who had built a mini on the Facebook page.  Who's going to try some of those other ones then :)

[Brod]

yes multistars run nice on 3S,not ballistic.
idea behind these little guys is to build em light,aim for around the 400-450 gram rtf mark and the Multistars will be fine.
also pick a high C 1300 mah 3 cell lipo,the C rating will make a difference on such a small quad,i noticed a big differance in overall power using theHK  nanos compared to the Zippy compacts even though the compacts were about 30g lighter.
using 2 blade props is more 'agile' in flight,faster than the 3 blades but the 3 blades seem more stable and easier to fly,maintaining a hover without constant throttle input like the 2 blade props.3 bladers also seem easier to balance too giving a smoother video.But I prefer 2 blades :)

[krikey]

I'd be interested to know how you balance 3 bladed props as these are easier to get hold of than the 5x3 gemfans.

[Brod]

with great patience krikey ;D keep adding and taking off tiny pieces of tape until happy,then turn props round on balancer,and keep checking.i've made my own balancer from an old rcboat prop balancer,the ones you buy are usually crap with hubs out of balance to begin with,useless...
they arnt far out of balance to begin with though.

they not gunna stay in balnce for long though as the slightest scuff or chip in a crash knocks em out.

[CurryKitten]

I've got a big pile of the 3 blades, I just can't get 'em to work for me at all.  It was wobble city before I went to 2 blades

[Brod]

that could be cause you running a higher KV motor on 2S,a lower kv motor like the Multistars on 3S will have more torque enabling the 3 bladers,which are heavier and use more amps,to run at better speed which the gyros on the KK will be able to respond quicker..so less wobble...

must be noted here also,i'm not using a Krikey frame but one of my own design wood ones.but its similar size and weight..

[CurryKitten]

that could be cause you running a higher KV motor on 2S,a lower kv motor like the Multistars on 3S will have more torque enabling the 3 bladers,which are heavier and use more amps,to run at better speed which the gyros on the KK will be able to respond quicker..so less wobble...

must be noted here also,i'm not using a Krikey frame but one of my own design wood ones.but its similar size and weight..

Yes, no worries, I was just talking generally about the 3-bladers.  I hadn't even tried them on my mini H or the K-quad, I started using them on my old Turnigy frame which was very light - so perhaps what you said is relevant.  I could never get them balanced properly though anyway, like you said the hubs are always way out to start with

[friesianflyer]

Right, everything ordered and on the way.....

Will update once everything arrives......

[Madmax]

looks fun quad  :) , what's the biggest battery people are using on these?

[CurryKitten]

On 2s, krikey and myself are using 1600mah lipos to get around 6 minutes of flight. These were chosen very scientifically based on the fact that I had some laying around and that's what I wanted to use.

In a previous mini quad I was using 850-900 mah to keep weight down, but then only got around 4 minutes.

[Pauluk]

Hey Guys,

First post,came over here because of this great little frame,bought one from another forum.

With the 1600 mah battery recommended iam getting it to hover at 60% throttle.

Frame weight including battery 390g.

Now whats interesting is with a zippy compact 2200 mah 2s she is hovering at 55% throttle and the zippy
is heavier than the Turnigy 1600,i guess its to do with the c rating?

Im using 5x3 HQ props,im pretty sure they have slight less thrust than the gemfans.

Great frame though loving it,will add the mobius soon then fpv gear later.

[CurryKitten]

That's an interesting stat Paul, which 1600 and 2200 are you using.  I get a 50% hover on the 1600 (although my KK stick scaling on throttle is set to 100% (it's 90% by default).. and that is with the Gemfans.

Be interested to know what sort of flight times you get on the 2200 - especially as it seems to find it easier to lift

[Pauluk]

That's an interesting stat Paul, which 1600 and 2200 are you using.  I get a 50% hover on the 1600 (although my KK stick scaling on throttle is set to 100% (it's 90% by default).. and that is with the Gemfans.

Be interested to know what sort of flight times you get on the 2200 - especially as it seems to find it easier to lift

The batteries:

1600 mah   80g  :  (Same as your i think)
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=37362

2200 mah 113g :

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=31977

THe only difference beside the weight is the constant discharge rating 20c and 25c


I have the stick scaling at 100%.

I would have thought the 1600 mah would be easier to lift due to weight,but it doesnt seem to be.

waiting on some good weather to take her for a spin over the park.

[CurryKitten]

Very slightly different, I'm using this one http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idproduct=34245 which doesn't fit between the legs - which is why my frame is upside down :)

But the specs look the same, I wonder why yours is lagging so much.  Looking forward to see how you do on the 2200, please update the thread once you get a decent day to fly.  As the size of it is very similar to the 1600 I use now (albeit a bit heavier)

[Madmax]

cheers for the suggestions guys on battery size, will  get some on order and see which ones work best  :)