Brushless Virus/hyper 7 Buggy/truggy build

[suicideneil]

4Kgs isnt too bad for a fully loaded truggy, especially whehn its the same power train as would normally be used in a 5-6kg truck afterall. I loike your chassis stiffener bar, looks like it does a good job to prevent chassis flex. Whilst everything fits on the chassis okay, the layout isnt the cleanest I've ever seen, but with a bit of thought and effort it could be tidied up I reckon- stick the rx behind the lipo and get make a simple tray for the lipo that bolts to the chassis to hold it more securely. If the brakes are rubbish and you cant afford a better esc at the moment, think about a mechanical brake if theres room somewhere to mount the servo and linkages.

Overall not that bad, not bad at all.

[florianz]

thanks for your feedback. well, its a rebuild, the first build was messier... but worked very well for many months.

it is difficult to get it tidy, with fan, ubec, esc etc... but I tried my best to keep it clean. I also tried to solve it all a bit different than other conversions, thats the point. I had the battery already like that in the old buggy, and it is absolutely safe. a tray is just extra-weight. less is better.

well, the esc: I ordered already a losi xcelorin, but after a month I was told it's not available at the moment. its's almost impossible to get it here, but the price-tag would have been interesting (about 170 usd). the mmm ist too expensive here in germany, and I don't really want to order things like that overseas (service). maybe I will order it at rcm, the price is right. In my point of view the losi is a good deal, I have a prog-card (mmm not), I have usb-wiring (ezrun not, hard to get new firmware), good service on their website for firmware-updates. like that, the losi has same price like the ezrun. There is a new prog-card out now for the ezrun, with which you can do updates for the esc (about 30 usd). the losi is up to 5s, that's fine for me. but right now I am short with money... for mech. brake therse's no space at all...

I'll go for a bash today, curious how the new compononents are like

florian

[florianz]

I had 4 lipos in a row today, without big problems. I have new (old) wheels I got cheap on ebay once. I have no Idea wich model they belong to. I have put some harder foam inside, to get the wheel more stable.


the diameter is slightly less than the crime-fighter truggy wheels (where one tyre is damaged). so I guess I need a 14t pinion, accelleration w. the 13t was a bit less then w. cf-wheels. top-speed was also a bit less.

on dusty ground the grip of the crime fighter was much better, but jumps and landing was by far better with these wheels. still I have better ground clarence then w. buggy wheels. these new old wheels are, even whith the new foam inside, about 80-100 grams lighter each.

best jumps today were around 10 meters, most times landed on all four wheels, just lovely.

the front bumper did a great job when I didn't land perfectly... also the new chassis has a great handling. I've put some weight (30g) to the front, so handling is just great now (less wheeling).
was good fun today
:D
flo

[florianz]

Just recently I've got myself an ofna torsen diff for the center.
pics




I've added some high pressure grease and some oil like that it works smoothly. A brushless-setup is just perfect for the torsen (balooning of front tires). there must be a solid reason that a "hummer" or a "audi quattro" have torsen diffs. and when it's ok for a hummer, it's ok for my buggy...

from my point of view, driving with the torsen is very different, you just can't compare it with a 100k-oil-center-differential. The torsen puts up to 80 % of the power to the axle with grip. That means you can't pull the throttle like before, this ends up in backflips. U must be much more sensitive with the trottle... in curves I think handling is also better than wtih a 100k diff. what can I say, It's just amazing, when bashing, acceleration is far better (being careful with the throttle!), you can get more power to the ground. almost NO pizzawheels in the front wow. I had to reduce the timing of the motor down to zero, just too much power...

as it is a buggy-chassis I have put some weight to the front. somehow reminds me of a quote I've read here: like an electric screwdriver on stereoids...

As my plane esc finally died from a bad soldering, I have time for a makeover of the buggy and to have a look at the torsen. There is NO wear after about 8 lipos. I've cleaned it, greased it and have put a bit of 15w40 engine motor oil into it. Like that, the grease is thinner and gets everywhere. just some normal oil would not be sufficient. Now the torsen works even smoother than before.

I increased the space of the "middle deck" above the steering servo, so I can place the new esc there (jamara flash, but not working on 5s yet...). the motor mount is super stiff. It's good when the chassis can flex a bit (torsion-wise), but NOT around the center diff.

My kind-of battery tray works great for many months now. Just once after a bad crash I lost the battery. I made it like that 'cos I like it simple. I dont't want to add a tray, some more scews etc, which is just weight. like that it's safe and simple. I know it has less "bling"-factor then e.g. a tekno kit, but, it's all self made, based on own ideas and, most important, it works well. the self made center bar is doing a great job, and the self-made front and back shock towers are just rock solid. aluminium is not always the first choice.



I have redone the Motormount a litte bit:


the motor mount is super stiff. It's good when the chassis can flex a bit (torsion-wise), but NOT around the center diff.




I am still very impressed of the losi motor, great torque; I have sealed the unused holes of the front endbell; sand and dirt are no good for the kevlar-bonding of the rotor.
These losi motors would deserve more attention.

florian