Boner

[typhoon_driver]

Re: Boner

I've not found that boner has an issue with being too slow as it is. It's done severe damage to a number of machines over the years so I don't see much point in increasing the speed. I like that it flips other machines on a regular basis.

I could go to 8s or 10s but the problem is that I don't want to drop below the 3Ah mark which makes the packs a bit on the large side.

I did a bit of testing yesterday with the wheels/hubs on whilst running in the motors and whilst there was a slight wobble it was nothing to get worried about so I think I'll just keep with it.

Down the line I could look at boring out a custom hub to 12mm when I get access to my lathe again.

[PJ-27]

Re: Boner

8-10s seems a bit overkill anyway. There are plenty of effective spinners, brushed and brushless that run on 4-6s. The only 10S I know of it LS4 and they run a huge reduction and rarely go above half throttle, the power is mostly there to get their 6.5kg spinning element moving!

[Eventorizon]

Re: Boner

We are using 10S on Binky... its really quite scary.

What are the side walls made of,. they look like 20mm Nylon, with your Ti baseplates and motor mounts

[ewan]

Re: Boner

Ah, a reminder to get the hubs finished...

[typhoon_driver]

Re: Boner

It's meant to be 20mm however when I bought it it was 22mm thick nylon. 4mm hardox bum and 2mm titanium top and bottom

[typhoon_driver]

Re: Boner

Ok quick update. I have since writing the above posts decided to run boner on 10s. Mainly for one reason. I was taking a look at hobby king and stumbled over these batteries

http://www.hobbyking.com/buddy.asp?code ... 27C3E15B91

Now granted the specs may be inflated but boner only ever drew the big current for a split second before settling down to a few amps on the drum. So two of these in series should do the business. If anyone happens to buy via this link you will get the same packs cheaper too.

Still in two minds about the brushless esc. I may go for an el cheapo option or stick with the castle creations and get the blown one repaired.

[PJ-27]

Re: Boner

El cheapo all the way! Plus then you can seriously over spec at little cost.

http://www.hobbyking.com/hobbyking/stor ... ouse_.html

Was keeping that Jem to myself. Bargain!

[typhoon_driver]

Re: Boner

No good i'm afraid, 7s max

[PJ-27]

Re: Boner

Sorry you did say you wanted to upgrade to 10s.

[typhoon_driver]

Re: Boner

Yup, 7s seems to be the limit for el cheapo controllers. I'm treating these batteries as an experiment. They should give a better performance than the hyperion I was using previously purely on the greater voltage but i'll need to see how they handle the power demands. I'm not overly sure on the figures they quote for discharge but time will tell.

Gonna bring both along to the champs so I can run in a few combinations should it be required.

[PJ-27]

Re: Boner

I thought the drum was already running at a good RPM. Seems to have good bite, can throw and keeps on hitting. Why so keen for the voltage upgrade?

[typhoon_driver]

Re: Boner

Well it's a motor that's rated for 10s as is the esc so I wanna see how the two of them run on 10s. Plus the lipo were cheap and we shall see if they give the performance they promise. A fair few good reviews of them but time will tell.

Also got my eye on another motor but again time and bank account will tell. It's something very special though

[Eventorizon]

Re: Boner

Can I ask what motor & esc you are looking at?

I am still a little confused when it comes to Brushless motors. Simply going bigger doesn't always mean more watts or torque.

For example: an sensored In runner I am looking at is 2650KV but is 4S max, where as a HK40 is 800Kv but can go to 10S. Both ultimately end up with about the same speed; 28'860 and 29600 rpm. But the HK40 is 120g heavier, so which way round is better? Can anyone shed some light?

[typhoon_driver]

Re: Boner

Currently I use a scorpion 4035 motor. These come in a number of KV ratings and tbh I can't remember which I have in boner as it's rubbed off. This motor is an outrunner, ie the magnets in the outer can rotate along with the shaft whilst the copper coils in the center remain static.

Inrunners as the name suggests rotate internally with the magnets sitting in the center of the motor.

For a given voltage generally an outrunner will spin slower than an inrunner. You will also get more torque from an outrunner than an inrunner (generally). These both mean that an outrunner is usually better for combat robots as they require less gearing to get a useful rpm range for a disc or drum.

The power of the motor will be given in the specification. The 4035s give around the 4 to 5hp range (same as a big magmotor!) and peak even higher.

The controller i'm using atm is a Castle Creations Phoenix Ice 2 160HV ESC. A very nice controller that has a data logging feature that means that i can download the data from the controller after the fight and see the current draw, voltage, temperature and rpm of the motor during the fight.

[Eventorizon]

Re: Boner

Out runner it is then! We need more torque than speed most of the time.

Though I spotted a machine with HK40's for drive which was interesting. Will took them at an event in germany I think?