I've recently ordered a pair of Graupner Speed 500 brushless motors (Christmas sale couldn't pass on it) Supposedly they are high torque low RPM . I intend to install them in a Robbe Type VII. I will be using a Robbe F 14 twin stick for dual control, Anyone have experience with these? Can Anyone recommend an ESC? Thanks in advance!
Anyone have experience with Graupner Brushless motors?
Collapse
X
-
Tags: None
-
I'm carrying the new MTroniks reversible (true reversible, mind) ESC's for brushless motors. They're not cheap, but they're beautiful units. $79 each with 30A capacity. I'll be creating the product page in the next couple of days. -
That looks like what I need. Its the reversible (true reversible) bit that has been the sticky wicket.Comment
-
Hi for the robbe type VII is this motor very good https://engel-modellbau.eu/shop/en/E...or-400-kV.html
and this esc is Programmable https://hobbyking.com/de_de/turnigy-...2-6s-opto.html
Discover the benefits of BLHeli_32 ESC firmware, including faster processing power, future functionality, and improved flight performance. Learn more now.
GantuRegards GantuComment
-
-
Good question; what I have found is that most Brushless speed controls have a "Braking" function which serves as reverse. This setup gives only partial reverse power or reverse for only a short time. I read True reverse as full power for as long as one needs it. As a former ship driver, I like to have full function on twin screws, to execute twist maneuvers etc... finding the esc that gives me that has been difficult.Comment
-
Any ESC worth it's salt would be programmable-with at least reverse(at various percentages) and braking that can be programmed to "no Brake" also punch (start force), rotation, timing, and Low Voltage Cutoff threshold for Lipos. Neutral range, Overtemp shutdown, reverse polarity protection and short circuit protection would also be nice.Last edited by Bob Gato; 12-13-2019, 04:11 PM.Comment
-
Indeed you are correct. I have loads of experience using brushed motors and esc. Not so much with brushless, except a wee bit of mucking about with airplanes. I think I have narrowed the search for esc . The next question is; are the graupner motors low speed enough? or will I need a gear or belt drive reduction? I thought perhaps I would give them a go direct drive and see how it goes. They advertise them as low RPM , high torque. However, I've never seen a brushless motor that wasn't insanely fast... Its all new territory for me.Comment
-
Stephen, The web site doesn't say what KV they are only that they are high torque/low RPM...I'm sure you'll be fine..If you get a read on the KV rating, multiply that number by the voltage you are using and that will give you the unloaded max RPM. Subtract 20% for inefficiencys and that should be the max RPM your prop will turn at...
Are you going to run twin motors or split the output?...if twins, I should say (you probably know this) you can't run two brushless motors off one ESC-must have two.Last edited by Bob Gato; 12-13-2019, 06:38 PM.Comment
-
-
If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.Comment
-
So Stephen, sounds like you are going to independently control each motor. I don't know how much distance between props and how long the boat is but chances are that differential thrust isn't going to do much for you. Consider running a wye lead to both ESCs from one channel and use the other channel for something else...Comment
Comment