I took the plunge and got this dyno and the RC Crew Chief software. I've only had a short time to play with everything today but it's pretty simple to get running with the help of this post and some youtube vids from RCCC and Edward (Thanks guys).

I also ordered the AC wall adapter for it and tried to run the dyno on 1s packs rather than 2s. The good news is that it works on 1s which should allow the dyno to handle lower turn motors. But I think I either need to try a different ESC or wire up an rx pack? I'm using an LRP SXX because I know they work on 1s without a booster/rx pack but on the dyno the motors would cog causing data inconsistency making the runs less useful than using 2s packs. I think if you can fix the cogging issue then using 1s packs would be possible.

I may pull my HW v3.1 1s out of the 1/12 to give it a try if I find some time for that.

Definitely keep us posted on your 1s testing. I would like to see how a 1s RC3 motor model will scale up to 2s. There are lots of non-linear effects that may mean it will not scale well but you never know unless you try. If you send me some results I'll do that

Bob I emailed you some data files using both 1s and 2s packs on my dyno.

This time I used the same LRP speedo but switched from 13.5 to 17.5 motors and found that the data was better with far less cogging. I'd still like to try it with a booster esc or rx pack but I haven't had time to do so yet.

Has anyone else encountered a dyno run that fails to end on its own? I have tested close to a dozen different brand motors now and have encountered a couple ( R1 and Fr1) that fail consistently. below are crew chief views of a couple samples that I manually stopped. Coincidentally the only 2 brands I am seeing this produce significantly more vibration than the others.

https://lh3.googleusercontent.com/-n...Ic42/fr1-1.jpg
https://lh3.googleusercontent.com/-r...Ic42/fr1-2.jpg

Never seen a run like that before. The dyno won't stop that on it's own as the RPM is always changing. It will only stop if it gets over 30kRPM or when it reaches a constant RPM. I think you can set it to shut off after a certain time but I've never tried that.

I would suspect the problem is sensor wire or sensor board. Does it do the same thing at all timing settings?

Same thing all the time on the same motors. All my r1 and fr1 motors do the same thing. I have noticed the r1 and fr1 motors produce significantly more vibration than the others. I used the same tekin esc and sensor wire to testing all my motors. The cycling rpm at the top occurs with a steady amp draw and fluctuating torque reading. I was thinking it might me a tekin specific thing.

Do you have a green light on the ESC so it is getting full throttle? If it is then the only thing I can think of would be to try a different make of ESC and see what happens.

Yep its getting full throttle, with the tekin's built in data logger i can see the runs throttle input as well as sensor read voltage and rpm.

I have now confirmed its not a speedo issue, I am seeing the same thing with the LRP and Speedpassion speedos i tried this morning. Are you still using the stock flywheel encoder or is there an upgrade one available?

The motors I see the faulty runs on vibrate alot more than those that are working and I thinking that vibration may be causing trouble with the optical sensor read.

I wonder whether the vibrations are causing it. I found my original flywheel is way out of balance (used a prop balancer) and have to hold the motor quite firmly as it jumps around so much. Maybe that is making the sensor disc flex abnormally and giving weird signals to the pick-up sensor.

There could be something to that, I will be ordering a replacement flywheel as soon as they are back in stock. I wish there was a heavier flywheel option available.

I bet both motors have ceramic bearings. I have a motor with the same issues, severe vibration with the flywheel, seems like the bearing have excessive play in them, so much that your optical sensor doesn't work correctly.

Guess I didn't understand your problem. I thought the motor was doing what the graph showed, cycling up and down in RPM.

The vibration problem certainly sounds like the issue. I always put my hand on top of the dyno as there is slight vibration in the flywheel. Otherwise it will move around on the desk. Maybe the optical emitter or detector are not fastened down securely. You should be able to peel off the cover on the base and have a look.

I'll have a check. I think the vibration is producing a false read resulting in the graph. i have clamped the dyno to the table but the vibration is enough to shake the table. So far i have seen it on 5 r1 and 1 fr1 motors.

Had the same thing myself and what it was is I had the flywheel too close to the housing so it was rubbing against it and loading up the motor more. Try moving the flywheel out 1-2mm

I know one of those makes has a issue with the ceramic bearings that where being changed out, at least .5mm shaft movement. The ABEC7 bearings are a bad batch.