Official Nexa OV-10 Bronco 1800mm ARF Discussion Thread

[WrightBrosRC]

Hi,
your pics are very impressive, thanks a lot! Can you give me any advice, regarding your outer wing pylons?
How did you attach those, did you scratch off the foil/cover?

Thanks,
Axel

Thank you, here's some info on the AIM9 launchers... I measured the curve of the bottom wing, assembled them from the stock in the photos (foam core with tapered leading and training edges), when finished I covered each of them with some thin card stock, painted, and glued them directly to the wing using Foam Tac. It holds very well and can also be removed if necessary for repairs. I don't have any rockets in the launchers yet. Working on that.

[Axelowski]

a few pics...

Hi,
your pics are very impressive, thanks a lot! Can you give me any advice, regarding your outer wing pylons?
How did you attach those, did you scratch off the foil/cover?

Thanks,
Axel

[WrightBrosRC]

Trial fitted the LG, i think this looks quite good... I calculated the lenght of the oleo, and will probably leave it this way... opinions? Wheels are 90 mm...

Looks good to me, more so than the stock units it comes with. My runway appears smooth, but the geotex hides thousands of potholes under its stretchy covering. The functioning struts help. I got a couple flights in the other day. This is a low alt drop. I'm about ready to put a camera in the cargo box, but after the first attempt landed in the water, I've been a little cautious.

[didier n]

Trial fitted the LG, i think this looks quite good... I calculated the lenght of the oleo, and will probably leave it this way... opinions? Wheels are 90 mm...

[Twowingtj]

Looks good Mike!

[MikeT]

I'm very close. Was missing the 4mm insert in the elevator so I pulled the hole drilled than tapped it.Otherwise it went together great.I just need to figure out how to transport it. LOL.

Mike

[didier n]

The LG i will be using, still needs some modifications, and i'll have to cut into the fuselage to get it all in when retracted.... Electron retracts, 100° now let's find some decent wheels...

[WrightBrosRC]

This is the video from yesterday's flight. The cargo drop went well, mostly...

[WrightBrosRC]

It's been a long day...

[TwistedGrin]

Just a note: XOAR PJN 15x7 prop fits the MotionRC stock OV-10 prop spinners.....I don't think any larger XOAR PJN prop will fit

TwistedGrin

[wperry38]

thanks for the reply i am using 2 4s 4000 mah looks like i will need about 8 oz in nose
BP

anyone else using the 4s 4000

[wperry38]

I am using/flying with two 5s, 5,500 MaH LiPo's. I added zero nose-weight.

Old Dawg

thanks for the reply i am using 2 4s 4000 mah looks like i will need about 8 oz in nose
BP

[sam51401]

Flap question
I used the stock CA hinges and HS225MG's and like to hear what deflection other are achieving as mine seem stiff and im concerned about stalling the servo when moving past the TO deflection. Thinking of redoing them and using pinned hinges to allow freer movement.

[fjkelley@cox.net]

I am using/flying with two 5s, 5,500 MaH LiPo's. I added zero nose-weight.

Old Dawg

[wperry38]

would you guys please share with me how much weight you are putting in the nose to get the c/g at 85.
thank you
bill perry

[didier n]

I don't believe that the 5S is gonna do it because turning a 14" prop at 7215 rpm just isn't enough. That motor was designed to use 6S swinging 16 inch blades at 8658 rpm.
Examples of rpm ranges for 14 inch props that have been time tested for performance and reliability are the FMS 1400 P-40B, FMS 1700 F7F and the FMS 1500 P-47.
All three planes use the same 14" prop blades which is 14x8.
The P-40 uses the 4S 4258-kV650 which turns 9620.
The Tigercat uses the 6S 4250-kV460 which turns 10,212
The Razorback uses the 6S 4258-kV460 which turns 10,212

Prior to FMS finally getting in the performance groove they used the 4250-kV580 on 4S which turned 8584 rpm which was okay but was highly criticized and modified over the years due to the less than stellar performance.

So as you can see the Spitty motor on 6S is still approx. 1000-1500 rpm below the range that is required for the 14" blade performance and on par with the old lackluster 4S 580kV days.

I'll also remind that the Spitty motor was designed for a 16x10x4.

The amount of pitch that is going to be required of that Variomoser to achieve the appropriate thrust factors will more than likely have that thrust erased due to extreme prop turbulence.
It will be interesting to see what you find if you do as expressed.
Best regards,

Interesting explanation, i will surely let you guys know the outcome... as said, i can always go 6s if needed.... We have a FL spit flying at the club, and i found it performing outstanding on 6s... with the standard 16 x10 prop.... so if my theory is correct when going down in size, i can increase pitch... I've also seen germans running 14 x14 prop's and getting nice results...time will tell

[OV10]

I will use the FL Spitfire 5055-390kV motors on 5s swinging a 14" 3 blade varioprop. This gives me the opportunity to set the pitch myself if it's not enough i can still go 6s ....

I don't believe that the 5S is gonna do it because turning a 14" prop at 7215 rpm just isn't enough. That motor was designed to use 6S swinging 16 inch blades at 8658 rpm.
Examples of rpm ranges for 14 inch props that have been time tested for performance and reliability are the FMS 1400 P-40B, FMS 1700 F7F and the FMS 1500 P-47.
All three planes use the same 14" prop blades which is 14x8.
The P-40 uses the 4S 4258-kV650 which turns 9620.
The Tigercat uses the 6S 4250-kV460 which turns 10,212
The Razorback uses the 6S 4258-kV460 which turns 10,212

Prior to FMS finally getting in the performance groove they used the 4250-kV580 on 4S which turned 8584 rpm which was okay but was highly criticized and modified over the years due to the less than stellar performance.

So as you can see the Spitty motor on 6S is still approx. 1000-1500 rpm below the range that is required for the 14" blade performance and on par with the old lackluster 4S 580kV days.

I'll also remind that the Spitty motor was designed for a 16x10x4.

The amount of pitch that is going to be required of that Variomoser to achieve the appropriate thrust factors will more than likely have that thrust erased due to extreme prop turbulence.
It will be interesting to see what you find if you do as expressed.
Best regards,

[didier n]

I will use the FL Spitfire 5055-390kV motors on 5s swinging a 14" 3 blade varioprop. This gives me the opportunity to set the pitch myself if it's not enough i can still go 6s ....

[TwistedGrin]

Thanks OV10....

James's comments are in his flight video from the Joe Nall event where he states the motor, prop and battery combo.

I intend to run either 5s or 6s on my set up....so I am looking for a good matching prop combo to go with it....thanks for running those number in e-Calc. Ya running the Power52's on 4s would not work very well at all.

I might just try out some 15x7's on the 5s twin battery set up and a 12x8's on the 6s set up .....

TwistedGrin

[OV10]

Motor comparison,

In the original MotionRC video by James....he states he had the Admiral GP20 motors with 16x9 props power by dual 4s LiPo and cruising at 50% throttle. This would be nice.....but the GP20 motors are rated at 295Kv......so at 14.8v that's roughly 4366rpm:

Just for comparison here are some numbers......
Admiral GP20 296Kv x 14.8 = 4366 rpm
Admiral GPS 4220: 770kv x 14.8v = 11396 rpm
Admiral GPS 4220: 770Kv x 18.5v = 14245 rpm
E-Flite Power 52 590Kv x 22.2v = 13098 rpm

We all know the Watts / Amp loads vary with battery to prop sizes for thrust. But I can't figure out if I could throw a 16x9 on the E-Flite Power 52 590Kv x 14.8v = 8732 rpm and have a long running set up?

TwistedGrin

I'm confused here TG. I can not find this video you are referring to where you say James is using the Admiral GP20 295kV (not 296) or 16x9 props
The only one I found is under the video's tab of the Bronco's product page which is listed as Step 6 Motors.
He clearly identifies the Admiral GP5 4220-770kV motors which are the ones recommended in the product overview page and those of course won't handle a 16 dia prop.

Regarding you quandary over your EF Power 52...…………. eCalc is a cheap tool @ $6/year.
I ran some quick numbers for ya.
The recommended prop to go with the GP5 on your Power 52 will be marginal in performance with just under 5 min run time using 4k mAh 4S.
Thrust/weight ration is .65 with operating temp of 100F and current demand of 30A
Put that 16x9 on the Power 52 and your run time dropped by half to 2.6 minutes on the same batteries.
Thrust/weight ration is 1.2 with operating temps jumping to 142F and current demand jumping to 71A

If you want to use a scale looking 3 blade like a MAS 16x10x3 then I would highly recommend a 6S power driven system.
Higher voltage always means more power efficiency for less current demands.
If you would like a recommendation for motors, I used the FL Spitfire 5055-390kV (6S) using that MAS prop on a 93" AMS A-26

I do believe you could have clearance issues with a 16 dia blade since this Bronco is a 1/6.8 scale bird whereas 15" is scale ( 102" is full-size)
I suggested way back in the beginning of this thread that the FMS Tigercat prop/motors would be a really nice marriage of power and scale fidelity of prop diameter at 14"

Hope ya found this info and suggestions helpful,
Best regards,