Bix3 Build

[Paul881]

I would not bother with thin ply, it will only add weight and if you have a smack then the foam will break around the ply. Speaking from experience of course 😀


It is right 😀

I think I have just came to the same conclusion. I have wrapped the motor mount in masking tape prior to glueing in position and then have messed about all morning with self adhesive Velcro for the compartments. In the pics below I have just dry fitted the Rx, lipo  and ESC to see roughly how they fit.

A key decision is how permanent do I want the two fuse halves glued together? I think I would need to split apart in future if I want to load fpv gear later on. Another view is that the Bix3 might not be the ideal plane for fpv and distance anyway, there may be better ones out there so I might as well keep this just for LOS  and short distance fpv? Would welcome comments......

[BlueFlyer]

of the 3 "compartments" I will have...

nose - 2 x 2200mah 3S LiPos
mid - Storm OSD
rear underwing - ESC and RX

I find that the fpv canopy is pointing down to much for my liking, this means the Mobius is getting the nose in shot... which is a no no for HD footage for my personal requirements. I will most likely build it up at the front so the mobius is perfectly level.

[Paul881]

Finally completed the build today and ready for its maiden tomorrow morning. BF, I have a Mobius and found the slope on the ply mount perfect - if I mount the camera on Velcro at the front of the canopy it doesn't get the nose in shot.

I don't know how they say that it's CG with one 3s 2200 LiPo is on the wing spar (1/3 of the chord). I have two such batts connected in parallel in the nose of the plane plus the Mobius and it only just about balances on the spar.

Will let you know how I get on and will try to post the evidence. It's my first rc plank flight in 40 years!

[Lola]

Good luck! Hope all goes well and look forward to the video 😀


It is right 😀

[FlightyFishcake]

Good luck - hope the flight goes well!

[BlueFlyer]

BF, I have a Mobius and found the slope on the ply mount perfect - if I mount the camera on Velcro at the front of the canopy it doesn't get the nose in shot.

I have the wide angle mobius, doh!! that'll be why the nose is in shot :(

good luck with the first flight

[Brucey]

Good luck Paul. At least you've got the weather for a maiden. Couldn't do that here at the mo!

[Paul881]

I was unable to get the Bix3 off the ground so has yet to do its maiden. :-[ 

It was a mistake in going for the 2728 1000kv motor (200watts) and only fitting an 8x4 prop.  So I'm going to try again this weekend using a 9x4.7 prop which according to eCalc will improve my thrust ratio from less than 0.5:1 to 0.61:1.  And to be very sure, I have ordered a 2836 1200 (340 Watts) motor which  would take the thrust ratio to 0.9:1 with a 9x4.7 prop.  I'll post back what happens..... :)

[Coyote]

Did ecalc tell you that the 200 watt 1000kv with a 8x4 would be fine ?

[Lola]

On a 3s lipo that's 11100 rpm's.

What's your AUW?


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[Paul881]

Did ecalc tell you that the 200 watt 1000kv with a 8x4 would be fine ?

No, it's what was a "recommended" motor for the  bix3 on the HK site. Of course, stupidly (more learning) I should have used eCalc to verify which of course, I didn't!

However, in my defence, I expected the craft to balance using a single 2200mah 3s battery as per the HK write up but unless you have a whole host of "stuff" in the forward position, this is pie in the sky so I have 2x such lipos plus a further counterbalancing weight bringing my AUW to 1.37kg.

However, looking at my setup now on eCalc gives me a thrust ratio of 0.61:1 which should be okay - unless anyone here can tell me differently? Anyway, I'll test it out over the weekend if I get up early enough before it gets too windy. :)

[Lola]

Should have flown imo. Not joking but do you have full throttle? I ask because I had to teach my turnigy plush my highest and lowest throttle position.


It is right 😀

[BlueFlyer]

Should have flown imo. Not joking but do you have full throttle? I ask because I had to teach my turnigy plush my highest and lowest throttle position.


It is right 😀

yes, have you calibrated your ESC?

[Paul881]

Okay, so we have lift off, my first RC flights in 40 years! ;D  Successfully had my maiden flights on Friday, all went well.  The first flight was 10mins and the second was 3 mins using 2x2200mAh LiPo's and a 9x4.7 prop.  I'll post the video when I get chance; I'm working away all this week.

Even managed two loops but its is under-powered with the 2830-1000 motor; I have now fitted a 2836-1200 and I expect much better performance next time. 

Thanks to Phoenix Flight Sim- without it, I would not have had the confidence to attempt it solo and there was a breeze to contend with.

[Lola]

Well done mate 👍, looking forward to the video.


It is right 😀