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BL_RV0 · **Ofna Hyper ST Conversion! -** 06.23.2008, 01:42 PM

Hey guys, this is my first "big" brushless conversion. I am going to the LHS in about an hour to go put my deposit for my Hyper ST pro kit! They don't have it in stock at the moment, so I am going to put a deposit on it, and if I get there before noon, they can have it in by tomorrow!

. My planned setup is the RCM mount and battery tray, Neu 1512 3D/F, MMM, and Protek 5s 4000 LiPo. Planned gearing will be somewhere around 52/16. Here is what I got when I calculated it.
Differential Ratio: 3.909090909090909
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 52
Pinion Tooth Count: 16
Total Voltage: 18.5
Motor KV: 1700
Tire Diameter (inches): 5.8
Tire Ballooning (inches): 0
Motor Current Draw: 70
Motor coil Ω: 0.012
Spur/Pinion Ratio: 3.25 : 1
Total Ratio: 12.70455 : 1
Tire Circumference (inches): 18.22 inches (462.82 mm)
Total Motor Speed: 30022 RPM
Vehicle Speed: 40.78 mph (65.5 km/h)
Estimated Adjusted Speed: 39 mph (62 km/h) - 5% loss
Effective KV Value: 1622.81
KT constant: 0.8 oz-in/A
Motor Torque: 0.29 ft-lbs
Final Torque: 3.68 ft-lbs
Final Power: 1295 watts (1.7 HP)
Hopefully the little 1512 will run cool in this truggy, because it is light. I still need to figure out what shock/differential oil I will buy. Any suggestions for a mostly bashing truck, and some track driving, (it will be on the one I am building, and it will have huge jumps!) You'll definitely see some huge air! I'll get some pictures tomorrow, of the box and building. I found a video showing the contents of the box, and apparently the differentials are pre-built, (a big plus for me because building diffs, IMO, is a pain.) I am going to try to keep this thing as light as possible with the battery probably all the way forward, the motor obviously behind the center differential, the ESC in front of the motor, (or maybe behind, depending on how much room I have because the MMM is big,) and the RX behind the battery (Airtronics 92836) using the XR3i I got from Lincpimp (thanks) and probably a Cirrus P-CS701BB that I have laying around to take care of steering. Only thing is, I don't know where to get a servo arm for it because the servo head is nearly 1/4" wide! Any ideas? The truck will most likely run on motor brakes, only because I don't want to deal with servo placement and such, and as I said before, trying to keep this thing as light as possible. Any thoughts on the project as a whole?

	(#1)
BL_RV0 RC-Monster Dual Brushless Offline Posts: 5,061 Join Date: Oct 2007 Location: Thousand Oaks CA	Ofna Hyper ST Conversion! - 06.23.2008, 01:42 PM Hey guys, this is my first "big" brushless conversion. I am going to the LHS in about an hour to go put my deposit for my Hyper ST pro kit! They don't have it in stock at the moment, so I am going to put a deposit on it, and if I get there before noon, they can have it in by tomorrow! . My planned setup is the RCM mount and battery tray, Neu 1512 3D/F, MMM, and Protek 5s 4000 LiPo. Planned gearing will be somewhere around 52/16. Here is what I got when I calculated it. Differential Ratio: 3.909090909090909 Transmission Ratio: 1 Other Ratio: 1 Spur Tooth Count: 52 Pinion Tooth Count: 16 Total Voltage: 18.5 Motor KV: 1700 Tire Diameter (inches): 5.8 Tire Ballooning (inches): 0 Motor Current Draw: 70 Motor coil Ω: 0.012 Spur/Pinion Ratio: 3.25 : 1 Total Ratio: 12.70455 : 1 Tire Circumference (inches): 18.22 inches (462.82 mm) Total Motor Speed: 30022 RPM Vehicle Speed: 40.78 mph (65.5 km/h) Estimated Adjusted Speed: 39 mph (62 km/h) - 5% loss Effective KV Value: 1622.81 KT constant: 0.8 oz-in/A Motor Torque: 0.29 ft-lbs Final Torque: 3.68 ft-lbs Final Power: 1295 watts (1.7 HP) Hopefully the little 1512 will run cool in this truggy, because it is light. I still need to figure out what shock/differential oil I will buy. Any suggestions for a mostly bashing truck, and some track driving, (it will be on the one I am building, and it will have huge jumps!) You'll definitely see some huge air! I'll get some pictures tomorrow, of the box and building. I found a video showing the contents of the box, and apparently the differentials are pre-built, (a big plus for me because building diffs, IMO, is a pain.) I am going to try to keep this thing as light as possible with the battery probably all the way forward, the motor obviously behind the center differential, the ESC in front of the motor, (or maybe behind, depending on how much room I have because the MMM is big,) and the RX behind the battery (Airtronics 92836) using the XR3i I got from Lincpimp (thanks) and probably a Cirrus P-CS701BB that I have laying around to take care of steering. Only thing is, I don't know where to get a servo arm for it because the servo head is nearly 1/4" wide! Any ideas? The truck will most likely run on motor brakes, only because I don't want to deal with servo placement and such, and as I said before, trying to keep this thing as light as possible. Any thoughts on the project as a whole? Get me back into RC!