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HelicopterHIROBOHirobo SDX › E-SDX FBL / GY750
02-17-2011 07:46 PM  6 years agoPost 41
davidevo50

rrApprentice

Montreal, PQ, Canada

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Now you're talking!

LIVE IN THE NOW!

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02-17-2011 08:21 PM  6 years agoPost 42
human213

rrVeteran

malibu

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ties

Ben, been using proline, nylon and floss for "surgical"
wire set ups for years...brought a smile to see those in your pics.

M

Not everything that can be counted counts, and not everything that counts can be counted.

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02-18-2011 05:20 AM  6 years agoPost 43
Dr.Ben

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Richmond, VA, USA

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SDX/GY750 governor set up

I just finished up configuration of the 750's governor for the E-SDX. Pretty easy. The collar was 6mm ID aluminum. I sleeved it down to 5mm. You can see the inset magnet. I turned the whole OD down to uniform dimension on my lathe. It's fixtured to the counter shaft with a 3mm set screw. The sensor is CA'd to a piece of carbon with an inset PEM nut. A single 3mm bolt through one of the extra holes in the frame holds the assembly in place. The 750 is configured for 4.71:1 ratio, the same as the t/r ratio of this model.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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02-18-2011 07:38 AM  6 years agoPost 44
Paul Woodcock

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Dubai - United Arab​Emirates

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Hi DrBen

Looks good. Love the whole project.

What did you 'glue' the magnet in with?
Are you not worried about it flinging out?

Regards
Paul

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02-18-2011 01:23 PM  6 years agoPost 45
Dr.Ben

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Richmond, VA, USA

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Thanks Paul.

I used JB Weld. It won't ever move. I've used the technique in the past on a gas model. The magnet is of low mass and rotating virtually on the axis of the counter shaft.

Ben

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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02-18-2011 04:09 PM  6 years agoPost 46
rocket_33

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Mount Pleasant,​Michigan USA

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LOL I had to ask when I read this
I turned the whole OD down to uniform dimension on my lathe
Please tell me you don't use THAT instrument at work lol

Sorry just had to ask

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02-18-2011 05:38 PM  6 years agoPost 47
Dr.Ben

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Richmond, VA, USA

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Nah, but I'd be lost without it for a lot of the tnings I do in the shop. I can easily get along without a mill. Lathe......not.

Ben

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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02-19-2011 04:26 AM  6 years agoPost 48
scott s.

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Orange, Ca.

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gy 750 gyro

i know the futaba pilots got them before everyone else, do u have to pay for them or are they free.

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02-20-2011 10:21 PM  6 years agoPost 49
rudyy

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E. Amherst, NY

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Dr. Ben,

Very nice setup. I am still flying flybared but with no paddle weight and longer 440mm flybar rod and I am very satisfied with the cyclic response. I just wonder how the difference would be with flybarless.

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02-21-2011 06:42 PM  6 years agoPost 50
Dr.Ben

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Richmond, VA, USA

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The stock FB model flies extremely well as we all know, arguably as well or better than the anything on the market in the 600 class. FBL adds efficiency, useable power, and speed to the model. Furthermore, you gain a high degree of tracking and stability that are normally lower on a FB model by the time the bell hiller ratio is reduced to the point that the cyclic become really fast.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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02-21-2011 06:50 PM  6 years agoPost 51
Dr.Ben

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Richmond, VA, USA

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Some stats

I flew the model again this past Sunday (no video, the guy with the camera wasn't at my private field).

My original set up expectation for this model was power on par or a bit above a well tuned 50 glow running on 30% nitro. I'm pretty comfortable I've achieved that goal. There is good power here. Perhaps not what those of you who want 90 sized power in a 50 will expect, but that was not my goal. Furthermore, I wanted in excess of 6 minutes of run time for big aeros and mild 3D. I'm comfortably getting 7 minutes without getting close to the 80% discharge point. The model flies on rails at 1950 rpm with a roll rate potential of easily 1/sec or so. Finally, the gearing is holding up fine. I've stopped thinking about it. There is no perceptable wear on the 89T maingear running with a 9T pinion. The entire power system runs no more than slightly warm to the touch; it's happy.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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02-26-2011 01:00 PM  6 years agoPost 52
Helicrazy4

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West Virginia

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video

Ben,

Will you be doing a video on your Heli? Would love to see It.

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04-13-2011 01:44 AM  6 years agoPost 53
rudyy

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E. Amherst, NY

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Dominique ditches the mixing arm on the grip and uses one single linkage rod from the swash directly to the blade grip whereas Dr. Ben's have two linkage rods, the long one from the swash and the shorter one from the washout arm to the mixing arm on the blade grip.

I just wonder what are the differences in flight performance on both design.

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04-13-2011 07:28 PM  6 years agoPost 54
payne1967

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uk

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the great dr bens will not be as sharp on the controls
and will set up on the fbl unit with less throws than the direct connected one
just look at the beast x throe problems some have and they end up reducing the distance on the servo horn ball position to get the bx to operate

both set ups will fly well
the direct connection will be suited more to 3d but you need strong link rods to cope with the extra force on them
the one using the levers will suit f3c style better and be more smooth to fly and the std link rods will be perfectly ok on the set up

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04-14-2011 03:04 AM  6 years agoPost 55
ttrip06

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Central Pa

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I am not sure I agree with your statement. I test flew my sdx a few weekends before converting over to fbl, I wanted to know and feel the difference. My setup with the fb was +/- 12 with +/- 8 on the cyclics and super stubs on the fb. I used my same std radix on the fb & fbl. I set my sdx per Dr.Ben method of using the bell mixers. I stared out with +/- 12 and +/- 8 ele and +/- 9 ail on FBL. My first 2 flight I spent triming and getting on the FBL stuff worked out. After that I started pushing the model, and was not entirely happy. Pitch seemed a bit slow, but the cyclics felt good. So I moved out one hole on the bell mixer going to the head block. After changing the input on the mixer and a few quick adjustments on the 750 I ended up with +/-13, +/- 9 elev and +/-10 on the ail. I could have just adjusted the rates up on the FBL controller but I wanted to maintain the good swash rate numbers so I could properly mix out any interactions. All I can say is wow, it felt as good as any 3d setup I have flown before. Knife edge tic-tocs up and down the flight line were effortless. It changed direction on pitch pumps with authority.

I have flown models with 3g and total g on 700 class models that were direct input to blades, and can honestly say I felt little difference. As with all things in this hobby there are many ways to get to the same end result. My comments are based on how I felt the model responed and flew using the bell mixer.

Swash Rates
Pitch 60%
Ail 62%
Ele 55%

Swash gains:
ele 85%
ail 78%

Tim Tripoli

Team Futaba, Rail Blades
Team Crash
ProggressiveRC

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04-14-2011 06:30 PM  6 years agoPost 56
payne1967

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uk

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the difference is only very slight
i've run direct and indirect on a sceadu
but the indirect is a freya evo 90 head using the evo upper mix arms
and the direct is a sceadu head
so different disc dia and damping (the same 600 blades fitted to both heads)

the indirect will and does fly 3d perfectly ok and jr use the same set up

the indirect will be slower than a direct input as the servos have to move that lilltle bit extra due to the mixing ratios
a good mix ratio will be as kiwk or can even be faster at the right ratios

i hope i make some sense
and i think you know what i was trying to say on my last post
in practice the thumbs won't notice as the old fading brain can't keep up with it

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HelicopterHIROBOHirobo SDX › E-SDX FBL / GY750
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