V-Tail Quad Scratch Build

[Vass]

Video brought me here, very smooooth, great build.

Whats the fpv antennas? Look like whips?

And why two? Is one he radio receiver? Sorry never seen a setup like that.

Ta, keep up the good work
Vass

[MrBen]

Back antenna is 433 UHF whip, front antenna is stock whip on racewood 1.2 vtx.

Thanks for dropping in

[Ant]

Ben - where do you buy your 1.2 gear from ? Is it significantly better than 2.4 ?

[MrBen]

drones vision, I also use lawmate vtx too which Hobby King sell now, for ages I had a good 2.4 pic then it just went bad and I couldn't get it back so I completely changed my whole ground station setup and frequency.

[Vass]

drones vision, I also use lawmate vtx too which Hobby King sell now, for ages I had a good 2.4 pic then it just went bad and I couldn't get it back so I completely changed my whole ground station setup and frequency.

Isnt 1.2 jail territory in UK? Air traffic contol frqeuncy? (Just askin)

And whats on the gopro lens?

Apols for all the Q's, i'm building to your spec today. Gonna use Ali U section down the centre fuselage.

[MrBen]

sorry did i say 1.2 I meant 25mw 5.8

Thats a layer lens to protect the gopro lens http://www.getfpv.com/accessories-51/layerlens.html

[Vass]

Ta for reply, B&Q here I come :-)


One more thing,  (and most important) where did you put the CG ?  :-)

[Dusty]

Isnt 1.2 jail territory in UK? Air traffic contol frqeuncy? (Just askin)

more like stern letter followed by fine territory (if they even find you)

One more thing,  (and most important) where did you put the CG ?  :-)

for best efficiency and reliability, you want all 4 motors spinning at the same speed, producing the same thrust. on a normal quad you'd draw imaginary lines from opposite motors (diagonally) and the CG should be where the lines make a cross.

with a V tail, I'm not too sure. I think you'd treat the rear 2 motors as a single point of down thrust, and make a triangle with the front 2 motors, putting the CG in the middle of that triangle.

[MrBen]

If I remember correctly it was slightly forward of the half way mark on the centre section, I kinda thought that as the back to motors lost some thurst with them being at 30 deg angle then it made sense to put the cog about a quarter of the distance between the centre and the front.

[Vass]

just had 2 hours of fun in the garage, not trying to thread nap, just thought I'd share :-)







Finished article :-)
Only changes are the Ali struts down the fuselage and 6mm ply as per MrBens suggestion
and I've set my V angle at 35 degrees

[MrBen]

Post away! Looks surprisingly familiar

I wonder how much stiffer it is than my 4mm ply version, mine could twist a bit if I held the rear and tried to rotate the front. You could probably do with some more bolts along the length too to stiffen even more.

[Vass]

I can't twist it at all, very strong, probably a bit heavier though.

[Vass]

I can't twist it at all, very strong, probably a bit heavier though.

Ben, what setup did you use on the KK2 as regards the rear two motors, i'm reading all about
Swapping them over and reversing power , all sorts of different methods on V quads

[MrBen]

just swap the esc wires for motors 3 and 4 on the flight controller and of course make sure the props are spinning the right way too.

[Vass]

Parts arrived today so thats My Bank Holiday sorted ! :-)