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-   -   My Tekno ET48.3 Build (https://www.rc-monster.com/forum/showthread.php?t=32345)

florianz 03.25.2017 05:34 PM

My Tekno ET48.3 Build
 
Hi there,

Good to be back at RC Monster :yes: I am Flo from Hamburg and I am RC-infected for about 10 years now.
I have done several 1:8 electric conversions and builds, this is actually my second build without converting a gas car into electric, it's "just a build".

I will also post some inside-view pics of the Medusa Afterbuerner brushless motor (probably including some nude hands...)

It took me a while to find the right setup for the truggy, now I am quite happy with the ET48.3. I like a soft setup, and I have installed the CS shock plates. The overall-quality of the Tekno is ok, the transmission, diffs have excellent quality, almost no wear so far.

I own the ET48 for about 1,5 years now, and lately have serviced the truggy (cleaning, new bearings etc.).
The body is new an got damaged already, fixed it with a 2 component glue (ZAP z-poxy quick shot). So far the poorest quality in regards to body shell.
I also cleaned the new bearings and oiled (special mixture) them, to avoid dirt sticking on them.

I changed the rear arms, as one arm has cracked again, number 4 so far. They always broke during "normal" driving.

For the rear end I made a skid-plate from epoxy/glass fiber composite, which is very durable. To avoid sand and dirt between the chassis and the skid plate, I have glued it on the chassis with car-silicone.
http://www.offroad-cult.org/Board/at...90454287_1.jpg http://www.offroad-cult.org/Board/at...90454584_h.jpg

In the front I have used kydex. Kydex is very rugged an can be bent under heat. I use Kydex for many years now, initially I have made battery-cases with Kydex. Simple, cheap and durable.

http://www.offroad-cult.org/Board/at...90454553_2.jpg http://www.offroad-cult.org/Board/at...90454613_i.jpg

new body:
http://www.offroad-cult.org/Board/at...90454678_3.jpg

As I had birthday recently, I have got myself a new motor, a 3680 Medusa Afterburner with 1600 kv. That's why I had to move the ESC backwards.

To stay cool I have glued a 12v fan on the chassis, which runs on 5s.

http://www.offroad-cult.org/Board/at...90454963_7.jpg

The new HV-Servo (Turnigy) has 21 kg torque, 0,16 speed (a bit slow). The servo horn I have found at egay, is kinda low-profile, and fits quite well.
As my RX receiver only works with max. 6,5V, I have installed the new HV UBEC just for the servo, with 16 AWG wires (!).

http://www.offroad-cult.org/Board/at...90455221_8.jpg
http://www.offroad-cult.org/Board/at...0455350_15.jpg

The capacitor-bank for the ESC is from a dead skyrc-ESC. The servo has a big fat capacitor to stay powerful. The wiring is as clean as I am able to...

http://www.offroad-cult.org/Board/at...0455427_17.jpg

to be continued in a minute...

florianz 03.25.2017 05:39 PM

Servohorn and servo are close together, but it works
http://www.offroad-cult.org/Board/at...90455624_a.jpg

http://www.offroad-cult.org/Board/at...90455755_c.jpg

I use longer and more flat 5s lipo batteries, because that is good for a low COG. It fits in after some work:
http://www.offroad-cult.org/Board/at...90455849_d.jpg

Due to the extra weight in the back, I had to change the setup of the shock, now it' driving well
http://www.offroad-cult.org/Board/at...7_dsc_0015.jpg

Here are the wires for the new HV-servo
http://www.offroad-cult.org/Board/at...9_dsc_0022.jpg
http://www.offroad-cult.org/Board/at...5_dsc_0023.jpg

The UBEC delivers 7,2 / 12 V, so I have fixed the switch with some glue; 12v would kill everything...
http://www.offroad-cult.org/Board/at...3_dsc_0030.jpg

to be continued in a minute :whip:

florianz 03.25.2017 05:46 PM

Here some more details about moving the esc to the back of the truggy, as I run the 8cm Medusa Afterburner.

The plastic on the right side is pretty used after the past 1,5 years. I have glued (with a 2k-glue) come carbon fiber onto the plastic, and bolted it on the chassis plate with two extra screws.

http://www.offroad-cult.org/Board/at...130_191341.jpg
http://www.offroad-cult.org/Board/at...319_194617.jpg
http://www.offroad-cult.org/Board/at...130_191650.jpg

The velcro is by 3M and works very well, the ESC is secured with some carbon-fiber thingie.

As the chassis looks like this, the skid plates are really a must-have
http://www.offroad-cult.org/Board/at...130_191759.jpg

Inside the skid plate you can see how it looks, when screwed together in hot condition. Fits perfectly.

http://www.offroad-cult.org/Board/at...211_205222.jpg

Here's the UBEC, which has two output-wires
http://www.offroad-cult.org/Board/at...319_194425.jpg

http://www.offroad-cult.org/Board/at...319_194449.jpgA

nitrostarter 03.26.2017 03:22 AM

Nice build! Those Tekno's are really nice units.

Where did you find the Medusa motor??

florianz 03.26.2017 04:03 AM

Thanks nitrostarter! This is the shop in Germany
http://shop.in-racing.de/anleitungen...oren-vergleich
http://shop.in-racing.de/brushless/b...-8-truggy/?p=1

florianz 03.29.2017 03:30 PM

I broke some more arms in the front... pretty annoying, so I am now boiling new arms, to make them more solid... it's like in the 90's.

The Turnigy servo is a piece of junk, works with a delay and is very very slow. So I was looking for a HV servo for a reasonable price. I found the new Team Corally servos, and as I rembered Corally as a good brand in my earlier 1:10 days, so I picked that servo.
Here some pics, the feel of the surface is just excellent:
http://www.offroad-cult.org/Board/at...9_182931_1.jpg
http://www.offroad-cult.org/Board/at...329_183021.jpg
http://www.offroad-cult.org/Board/at...329_183521.jpg
http://www.offroad-cult.org/Board/at...9_183608_1.jpg
http://www.offroad-cult.org/Board/at...329_184753.jpg
http://www.offroad-cult.org/Board/at...329_184812.jpg
http://www.offroad-cult.org/Board/at...329_185423.jpg
http://www.offroad-cult.org/Board/at...329_185710.jpg
regards, florian

nitrostarter 03.29.2017 09:13 PM

I have a Holmes HV500 in my Bomber and it's a great servo. Strong and quiet.

Just picked up a Protek 370TBL for my Wroncho. This one isn't as fast but I lodge my front wheels, it will wag the rear end side to side.


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