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HomeAircraftHelicopterHIROBOHirobo SDX › FBL SDX
12-30-2010 02:30 PM  7 years agoPost 1
rudyy

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E. Amherst, NY

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Has anyone converted the SDX into FBL? If yes, what head parts are needed for such the conversion?

Rudy

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12-30-2010 03:51 PM  7 years agoPost 2
Agilefalcon

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Fort Worth, Texas

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Here's a pretty good summary of what others are doing:
http://www.rcrotorz.com.au/showthre...ybarless-Sceadu

I have provided feedback to Hirobo via MRC, though I am not sure how much of an impact the general US flying population has on Hirobo's future plans in the areas of electric models or flybarless.

Generally, Hirobo keeps their plans fairly obscure. When they do deliver, what you get is usually well proven - your hard earned money isn't used to beta test the equipment.

Hirobo has generally had a good relationship with Futaba, so I would be very surprised if they were not already hard at work with flybarless conversions for the models.

We all know that electrics are the next wave in the hobby. Hirobo came out with a beautiful model, the Lepton (great name for an electric model) that lead the way for larger electric models of the smaller variety (a bit of a paradox that!). They've updated their high end FAI machines for electric and it seems to me, that they would want to develop a mid size/mid priced, electric and flybarless model.

However, there is no telling what Hirobo is up to. Very few people are "in the know" and Domink is one of the few outside of Japan that might have a clue.

We all know that when Hirobo does bring a head or model to market, that it will set a standard in reliability and quality. That's what they do, that's what we want and appreciate.

Meanwhile, the SDX is extremely easy to convert to flybarless. In the new year, I'm going to get a Beastx and give it a bash. However, I will say that the SDX flies superbly with a flybar and it will be an extremely tough proposition to make it fly better with a flybar. On a nitro model, it might not be worth it. On an electric model, the benefits of a flybarless set up may make it more practical.

Chris Berardi
Team BobbyJack's Hobbies

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12-30-2010 04:11 PM  7 years agoPost 3
fung_jeff

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Vancouver, BC, Canada

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Ask MrktPlayer, he even have photos in the best hirobo pics thread.

Jeffrey Fung...15 Years old - FLEET: Evo 50, Raptor 30, Trex 500, SDX's, X-Spec, Logo 10/400

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12-30-2010 05:44 PM  7 years agoPost 4
budz

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las vegas

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isn't the head the main difference between all evo models? i got a sceadu first then an evo because i wanted to try and see the difference between the fz3 and fz4 heads then lately, i got an sdx because i wanted to see and feel the difference between all 3 heads.

since they all have the same airframe, will putting a flybarless head on my non-evo sceadu and putting an sdx canopy/landing gear makes it an sdx then?

team solo

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12-30-2010 06:56 PM  7 years agoPost 5
Dr.Ben

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Richmond, VA, USA

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The SDX uses a new head, D3 tail assembly, and in the case of the SWM model, a completely revised servo mouting arrangement.

I'm on the home stretch in my SDX FBL conversion. I'll be using the CGY 750. I've converted the stock head but will be employing the bell mixers with a fixed tie-in to the head block for the rod that normally goes to the see saw. Besides more on less straight vertical pushrod geometry, the use of the bell mixers will allow me to adjust the throws to what the FBL system wants without having to deviate far from mfg suggested PIT AFR's of 50%. The model uses 12S 3300 power and 9/89 gearing on 550 kV. I test ran the transmission yesterday. It was incredibly quiet with basically no vibration.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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12-30-2010 07:03 PM  7 years agoPost 6
fung_jeff

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Vancouver, BC, Canada

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Can take some photos of your SDX Dr. Ben?

Thanks

Jeffrey Fung...15 Years old - FLEET: Evo 50, Raptor 30, Trex 500, SDX's, X-Spec, Logo 10/400

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12-30-2010 07:29 PM  7 years agoPost 7
Dr.Ben

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Richmond, VA, USA

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When it's done....

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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12-30-2010 08:23 PM  7 years agoPost 8
rudyy

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E. Amherst, NY

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Dr. Ben,

If it flies well, please disclose the instructions of the fbl conversion.

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12-30-2010 08:42 PM  7 years agoPost 9
Dr.Ben

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Richmond, VA, USA

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There will be no IF's to it. I'm certain it will fly superbly.

Ben

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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12-30-2010 10:52 PM  7 years agoPost 10
payne1967

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uk

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the sceadu flies great fbl
so the sdx will fly great fbl
although my sdx is staying flybared

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12-30-2010 10:53 PM  7 years agoPost 11
gorn

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Western Australia

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I did a conversion for s a customers SDX.
Used the Mikado washout base, and some Freya long balls on the grips.
I cant remember which part number.
Offset came out to exactly 31mm from center of head block to center of ball.

For the love of the hobby

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12-31-2010 02:42 AM  7 years agoPost 12
jbiter

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Sebring, FL

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The RJX head also works nicely after a minor modification to accept the 4mm jesus bolts.

Jeff

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12-31-2010 07:08 AM  7 years agoPost 13
Andy.Kim

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Seattle, WA

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I'm using the stock head. Pitch links from swash to blade grip. The conversion is rather simple if you use the stock head.

Use the pivot bolts for the 135 degree swashplate for the main blade grips. The stock nut will work with the pivot bolt. For safety reasons I used JBweld to secure it.

I used Trex 700 3G pitch links with UK links. They are strong.

There's a Hirobo swash driver but it's only available in Germany. I ended up getting a Century swash driver instead.

RJX flybarless head is an option but I kind of like the plastic head of the SDX.

I just took this video today
http://www.youtube.com/watch?v=Q8wbDc58Wvs

I'm struggling to solve my tail vibe issue and my OS55 is bogging a lot. I can't seem to get rid of the tail wag and the tail won't hold. I'm beginning to think the JR8900G could be the problem.

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12-31-2010 02:59 PM  7 years agoPost 14
Dr.Ben

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Richmond, VA, USA

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Given the reliability history of the 8900, that could be it.

I listened to your video. Is the gain on your governor running as high as it can? It sounds like it's really lagging when you ask for power. If I didn't know otherwise, I'd think you were on throttle curves that were a little too conservative. If the engine is lagging, the tail is going to try to let go every time you load the head.

How much time is on that engine?

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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12-31-2010 03:26 PM  7 years agoPost 15
payne1967

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uk

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i would look at the rear bearing
and check the exhaust is tight, my os55 started to bog a lot and cut out and the one exhaust bolt had come loose

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12-31-2010 05:15 PM  7 years agoPost 16
Andy.Kim

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Seattle, WA

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I'm using the multi gov and I tried lowering the settings a couple points across all settings thinking that would help.

I bought a used OS55 and I changed both bearings. Condition looked fairly good when I got it and I have about one gallon through it. It's odd, sometimes its running well and other times I nearly kill it. I'm not using a gasket on the muffler either.

I'll add a gasket and try changing the settings on the governor. Hopefully the LHS has a BLS251.

Sorry for goin off topic Ruddy

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01-02-2011 03:43 AM  7 years agoPost 17
maj

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united Kingdom

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It's been done several times. Chech the link out. I wrote how I modded the standard head (MAJ) and it worked a treat.

https://rc.runryder.com/t610799p1/?highlight=Mj

MJ

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01-02-2011 03:53 AM  7 years agoPost 18
Dr.Ben

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Richmond, VA, USA

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I did it your way with the stock mixers in place and tie down to the head block. I wanted the mixers so I could tweak the total collective and cyclic range to that suggested by the FBL system's mfg. It varies a great deal from one company to the next. For example, the Total G needs something like +/- 10 D of cyclic. The upcoming CGY750 sets up with pitch and throttle curves pretty much exactly like you would use for a FB model.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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01-02-2011 06:21 AM  7 years agoPost 19
R.J.

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SF bay area, CA USA

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Dr.Ben,

When you get the CGY750 going, please give some feedback on how easy/difficult it is to hold a precision hover, F3C style, over a spot. Some of the other FBL systems I have tried hover fine if you leave it alone, but don't do well when you need to micro-manage to hold over a spot. Thanks.

Regards,
Rick

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01-02-2011 03:45 PM  7 years agoPost 20
Dr.Ben

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Richmond, VA, USA

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Don't worry; I will.

The feedback I've gotten so far from someone who actually knows what you're talking about has told me the the 750 is very promising in this area. Less of the disconnected feel like you're driving a bus from the rear seat.......

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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