LX SU47 twin 70mm build - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-20-2015, 10:12 AM   #1
4stripes
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LX SU47 twin 70mm build


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Fall weather means less flying and the start of another model. The LX SU47 is a good fit for our fleet since it will use the same power setup as our FW ME262 and the same batteries as most of our other jets.
http://www.lxhm.us/En/Product/detail/id/15.html
Purchased in kit version from findhobby it was delivered in less than a week. The CS 12 blade fans with Cyclone Power 2000kv outrunners came from Hobby Paradise. I dynamically balanced them earlier this year in the same way the A10 fans were done. Here is the data on these fans.
http://www.rccanada.ca/rccforum/show...=Cyclone+power
The YEP 80amp ESCs and other electronics like hinges, servoless retracts, gear legs, electric brakes servos and BEC came from Hobbyking.
The plane is EPS and is very fragile so reinforcements are necessary. To start we added two long hardwood dowels running along the belly into the nose glued in with PU glue. The small canopy opening is also being enlarged to make battery placement easier. The aft part of the battery compartment was cut away and the sides widened to accept our Gens Ace 6S 25C 5500mah packs.
When fitting the fans we had to open up the hatch further aft so some material was cut from the fuselage and glued to the hatch.
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Last edited by 4stripes; 10-20-2015 at 11:00 AM.
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Old 10-21-2015, 08:00 PM   #2
4stripes
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Re: LX SU47 twin 70mm build

Some video of the stock setup.
https://m.youtube.com/watch?v=YVujtuAvwBo
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Old 10-21-2015, 08:20 PM   #3
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Re: LX SU47 twin 70mm build

Full scale video with some views of thrust vectoring and control surface movement.
https://m.youtube.com/watch?v=16YbQs...irstySiKaX3vwB
This original version of same video is a little clearer.
https://m.youtube.com/watch?v=H1wXsygQTVA
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Last edited by 4stripes; 10-21-2015 at 08:25 PM.
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Old 10-23-2015, 08:38 AM   #4
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Re: LX SU47 twin 70mm build

Looks like a interesting project Eric. Given the aircraft design with the forward swept wings, I am interested to see what you are going to do to add additional strenght to the wings. I expect there will be significant stress put on them with this design. This model might be a good candidate for a stabilization system. Keep us posted.

Marty
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Old 10-23-2015, 09:59 AM   #5
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Re: LX SU47 twin 70mm build

Hi Eric, I purchased the same kit from Banana Hobby last year and never got around to even start it, but brought it with me to California this year, to put together and have something "different" to fly. Will watch your thread with great interest. The demo video from Banana Hobby showed that it did fly pretty nice, however, those plastic retracts and struts leave a lot to be desired. I have a set of metal electric retracts for it and the Change Sun EDF units. Good luck with the build, I hope to see a lot of pictures
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Old 12-06-2015, 08:02 PM   #6
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Re: LX SU47 twin 70mm build

The more I look at this foamie, the less I like it. Too much crammed into to small an airframe for my liking. The wings get glued into place and then insert two very small spar stubs, really...are they kidding. The landing gear is plastic and aluminum tubing. Just how robust is that.
I figure with two 70 EDF's, a big battery and more servos than I care to count, I think this model will make a nice ceiling hanger at the moment. I think a twin 64 mm and lighter batteries with no retracts or landing gear would make this an more fun model. They have huge cheater holds in the bottom, great for hand launching.
Might re-motor the 70 mm EDF's with Mega motors, a lot less power but a lot lighter setups using a 3 cell setup.
At least these are my thoughts Eric, good luck on your build, I will certainly follow it.
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Old 12-06-2015, 08:10 PM   #7
4stripes
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Re: LX SU47 twin 70mm build

Weak design is nothing new for LX models but thankfully foam is nice to work with and CF is plentiful these days.
The A10 was no different yet with some strengthening is easily one of my favorite models.
Can't wait to find time and finish the SU47 but FW models keep popping up!
Not complaining though as too many models isn't really a problem at all (or is it?).
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Old 12-16-2015, 08:22 PM   #8
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Re: LX SU47 twin 70mm build

We have decided to start with the factory CG which is 20mm behind where the wing LE meets the fuselage. With this in mind the main landing gear retracts are mounted as far forward in the kit openings as possible and will swing aft. A small compromise from scale but saves extensive reworking of the openings. We are using the medium sized servoless retracts with alloy legs from HK and Lander electric brakes. The wheel size looks pretty reasonable and the body angle looks decent too. The retract mounting plates had to be removed and new ones screwed to the other side of each retract to allow easy attachment to plywood plates glued into each gear bay. I have some spare retract mounting plates from some large retracts which were re-drilled to match the medium size. Nose wheel steering is via pushrod and the door controlled by a fishing line to save using a sequencer. That fishing line linkage kept us busy for a couple hours but works well now. The supplied thrust vector nozzles are really long so we will substitute some FW nozzles that would be common to their SU34. The flight controls will consist of typical elevators, ailerons, canards (slaved to the elevators), flaps, rudders, thrust vector nozzles with full 360 vectoring and electric brakes. Just one too many functions for my 8CH RX unless I use some servo mixers from the elevators, ailerons to control the TV nozzles. This will leave me a channel for flaps and another for brakes.
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Zen thinking * It's rebuildable till it fits back in the box. **
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Old 12-17-2015, 10:17 AM   #9
Dutkoski
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Re: LX SU47 twin 70mm build

Hi Eric,
What part number are the HK retracts, I just might have a set with me. I'll be following your build closely and assembling mine at the same time. I will be moving my twin ESC up forward and cutting into the partition that separates the two intake ducts. Mount them in the partition so both sides of the ESC's will be exposed to the incoming airflow, but not sticking to far into the air flow. I do not like really long wires going from the battery to the ESC.

John

Oh, those new 70 mm fans arrived from X-Flight yesterday, 14 bladed impeller. They look pretty darn nice and the blades appear quite robust. Balancing the impeller was a breeze as well, just a little bit of glue and it balanced perfectly. The Dr Mad Thrust (aka: RC Lander) motor slipped into position nicely. I think I will wrap one or two narrow layers of aluminum duct tape around the motor to take up any clearance so the motor fits snugly. It's a long motor so the support will lessen the strain on the mounting section. I bought three of these fans.
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Old 12-17-2015, 10:35 AM   #10
Dutkoski
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Re: LX SU47 twin 70mm build

Almost forgot, why are you repositioning the main gear? The video of it in Banana Hobby's website showed it taking off fairly smoothly.
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