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Frankenstein proj.
#1
So I've ripped the guts out of a new Sky Viper s1750 (2017) and I'm going to Frankenstein them onto a Usmile Smart 100 KingKong frame.  Would really like to know if anyone has done similar project and if so, have you been able to get Cleanflight to work?  I read in another forum that you have to solder a FTDI board onto the FC but it refered to an older version of the FC and I need help with where to connect the 6 pins on this  FTDI board to the Sky Viper s1750 FC.  I have attached pics. 

Also if anyone has been able to get Cleanflight to work with the board and adj the rates I'd really like to hear how that went.

Thanks in advance!


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#2
Welcome to the forum!

I remember reading about these SkyRocket quads a couple of years ago. At the time, their firmware was a heavily customised version of Cleanflight, but they did at least publish the source code on their web site. Checking their site now, I don't find any source code at all.

So, either they've developed their own firmware from scratch, or they're breaking the terms of the GPL license by not making the source code of their modified Cleanflight available to download.

Your first picture shows four pads labelled TXD, RXD, V+ and GND. That's a UART for sure and if you connect TX on your FTDI to RXD on the board, RX to TXD, 5V to V+ and GND to GND, maybe you'll get a connection. You'll probably have to use an old version of the Cleanflight configurator and you will not be able to update the board to any newer version as the hardware was quite different from any officially supported flight controller.
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#3
@unseen;  here is where I've found their support - http://sky-viper.com/opensource/  Thanks for the advice on the FTDI connects and not flashing new firmware.  I have seen the firmware suggestion elsewhere as well.  I just ordered my upgrade parts if you're interested, I've listed them below.

from Amazon.com
Usmile Kingkong Smart1oo Carbon Frame  $11.48
Gemfan 2040 3-blade Hulkie, Green (2x4x3), 8CW 8CCW  $11.99
HobbyTiger 3.7v 1200mAh LiPo25C (5pcs) w/30W charger  $24.99

from http://www.pirofliprc.com
Textured Aluminum Stand Off 20mm; Gold  $3.96

from http://www.sparkfun.com
SparkFun FT2313X Breakout FTDI board  $11.95

No FPV yet, I'm going to try and master this LOS first, besides I have absolutely no idea which goggles to get into.

Thanks again for the help.
Shaving says a lot about a man. Like, "I'm not one."
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#4
I can't say for certain, but I reckon that a 1S 1200mAh battery is going to be a bit heavy to give good performance, if it even manages to give enough power to get off the ground!?

Not necessarily a bad thing, but I have never heard of HobbyTiger, maybe someone on the forum has experience with these cells?
Generally its a good idea to get batteries from a reputable source, I bought a whole load of cheap batteries for the E010, 210mAh instead of the 150mAh they shipped with. Even new, the flight times were half as long as the originals even though they weighed about the same, then after 4 or 5 cycles, they were finished, couldn't even get the craft to hover at full stick!
Windless fields and smokeless builds
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#5
Looking at your parts list, I don't think this is going to work.

The s1750 uses 7x20mm brushed motors. As provided, the motors are connected to reduction gears to lower the RPM and increase torque to drive the large propellers. The propellers screw on to the drive shafts.

Your GemFan Hulkie props have a 1.5mm centre hole and two 2mm holes for bolts to mount them on top of a brushless motor. Your 7x20 brushed motors on the SkyViper will have a gear on the shaft which may be very difficult to remove without damaging the motor. Even if you do manage to remove the gear, the motor shaft is only 1mm and there is no way to mount the Hulkie props with the 2mm screws either as they're not designed for this type of motor.

Although you can buy a 1200mA/h 1S battery for the s1750, the only reason this battery isn't too heavy is because of the geared drive system and the large propellers. If you try to use 2" propellers and 7x20 motors to lift a 1200mA/h battery, all that will happen is that you'll burn the motors out before you get off the ground.

Even if you buy the 8.5x20mm motors that your frame is designed for, the motor shafts are still 1mm and there is no way you will be able to fit the Hulkie props to the motors.

tl;dr Your props won't fit your motors. The props won't generate enough lift with a 1200mA/h battery.
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#6
Thanks for the info fellas.  Really wish I saw this earlier.  Everything you guys said I can now confirm. Sad I'm getting different props and some 7mm motor mounts b/c the King Kong 100 uses rubber grommets to mount the motors and I didn't really like that.  I tried to make the Gemfans fit by threading dental floss through the hole several times but they flew off.  Anyways, I'm chalking it up to beginner mistakes.

Skall!
Shaving says a lot about a man. Like, "I'm not one."
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#7
FYI, you will need to drill the shaft hole of these props, they are designed for the 0.8mm shaft of 0615 motors, not the 1.0mm shaft of 0716 or 0720 motors, also using 30.9mm props on a 100mm frame will probably not generate nearly enough thrust, for a 100mm frame you ideally want to use a 450mAh battery with 8520 motors and 56mm (or 65mm if they fit) props.

Edit to add : Just checked - the smart 100 frame uses 8520 motors with 65mm props, I reckon the 0720's will struggle to give enough punch to make it fun to fly...
Windless fields and smokeless builds
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#8
You're probably right. This is a great learning experience and I appreciate all the help. If I have problems I'm going to replace the motors and props and see how it goes. If I get it to work I'll be sure to post it here.
Shaving says a lot about a man. Like, "I'm not one."
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#9
Keep us posted, even if it doesn't work, let us know! Sometimes knowing what doesn't work is almost as helpful as knowing what does!
Windless fields and smokeless builds
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