Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length.

[bubbletop409]

So this is my first venture into the world of brushless motors/muti channel radios and ESC's that require programing. The setup is as follows Specktrum DX6i radio in mode 2, twin Leopard 4074  1050KV motors, twin Seaking 180A ESC's with one positive lead open, powered by twin 11.1's in parallel for each motor.  My problem is I need to move the throttle stick about 40% before the motors begin to rotate, then they seem to increase RPM very rapidly. I would like the RPM to start sooner and have a broader range of adjustability.

Can anyone tell me where in the menu I need to go to adjust the start up point, thanks for the advice.

Larry

[kinmel]

The manual can be downloaded from here............      http://www.hobbywing.com/uploadfiles/sx/file/Manual/HW-15.pdf

There is also a programming card available

[malcolmfrary]

Looking at the .pdf in the link, there seems no mention of tweaking the deadband of the ESC.  Presumably this can only be done by programming the TX.  It does seem a shame that manufacturers have little interest in providing fine control, but feel the need to cater exclusively to the terminally ham-fisted.

[Subculture]

Plenty of decent manufacturers of brushless ESC's. however don't ever expect the low speed finesse of a good brushed system from a sensorless brushless motor. A good sensored brushless system will get very close, but even they aren't quite as good IMO.

I personally find this lemming like rush to brushless systems somewhat bemusing. They have their place, great where you want high power levels, or where space is very tight, but you have to bear in mind they have a few drawbacks.

[bubbletop409]

There was no rush on my part to jump on the brushless bandwagon. This move was predicated by AstroFlight raising the price on their marine series motors to astronomical levels. I am powering a 1/16th scale Air Sea Rescue boat ( 63 3/4" ) and AstroFlight motors are all I have ever used in my previous builds, and having had no previous experience with other large DC motors I felt brushless was the logical choice. Very slow speed idling is not an issue with me, as these types of boats are made to ride up on a plane.

Perhaps a glossary or index would be nice for some of the manufactures to include for us rookies who are un-familiar with ever term and setting.

Thanks for all the suggestions, after playing with the settings on the TX I think I am moving in the right direction. I am headed to the lake momentarily for a test as I am leery of applying full throttle with no resistance on the props, but I have managed to get the motors to start turning much sooner.

[Subculture]

Wasn't referring to you specifically, just noticed a lot of modellers going straight for the brushless option without really thinking through whether they actually need it.

You may want to tweak the timing a bit, this definitely has an impact on the start-up character.

[bubbletop409]

Didn't take it personally, just giving my reason for the switch. My last build I paid right at $ 100.00 each for a pair of Astro 40's. When it was time to buy power for this build I was shocked to see the price on each had jumped to $ 425.00, are you serious AstroFlight?

So my lake test went well, and I have concluded that the issues I was having are related to the TX and not the brushless motors or ESC's. All my previous boats have been DC powered controlled with a basic pistol grip type 2 channel radio. This time I wanted to have more controllable features and went with a six channel air craft type radio that takes much more programming to suit your individual requirements. Once I figured that all out and made the correct settings everything worked fine.

One question regarding motor timing: what are the guidelines and how do the various settings affect the motors? Can you have two motors with the same timing other than 0 turning in opposite directions with no ill effects? I am dealing with Leopard 1074's @ 1050KV, two 11.1's in parallel powering each motor, currently set @ 0.

Thanks,
Larry

[Subculture]

If the motors are running satisfactorily best to leave the timing alone.

[bubbletop409]

The timing is currently set at 0. I read the motors I have are a Y type and like 11 or 15 degree's.

So my lake run went well for the first 45 minutes today, took my wife with me, we hung out with the guys for a while, then walked the mile and a quarter around the perimeter of the lake running the boat along side. So far, so good, then during a speed run I clipped something underwater with the port prop, and then had to make a hard turn to starboard. The port prop was severely damaged and inhibited the ability to turn hard right. Boat ended up stuck fast in a tree branch hanging off of Duck Island, and I was forced to wade over to retrieve it in less than clean water. I was amazed the motor could bend the prop so much without damaging the universal joint.

[TomHugill]

Bubble top, sounds like you haven't set your end points yet.

I think the hobbyking esc are the same as mine. This is what I do:

Turn on transmitter power with esc unpowered hold throttle upto your max throttle position.

Power up the esc; you should hear beeps. Now move your stick to zero throttle point and wait for the beeps. In forward only mode your esc should be calibrated.

But I'm running forward and back I hear you say! Well I think you move throttle to full back as either second or third step in the sequence. You'll have to try both as my challengers jet drive and therefore forward only.

I'll have a play tonight though!

[sparkey]

  I would get myself a programme card it makes life so much easier,you can set up the ESC in about 5 mins. don't forget that if your ESC has no BEC you need to plug rx battery into card,you can pick one up for about £10,hope this is of some help,Ray.