Electric Open B is reality in 2007 Q&A
Moderator: hbartel
If waiting for Spring, you might try visiting the "Toledo Show" about the first week of April. You usually find a lot of stuff that is new. The RCCA booth has been across the isle from Wildcat fuel for several years and that brings us a lot of traffic. Last year we had electric booths outnumbering nito booths.
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by BenJammin</i>
<br /> I did have my eye on the Scorpion 30-14's. Are you rolling your own Drew?
Electric combat is so darn nice I just hate to have to go back to slimers.
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I roll my own to get a KV that matchs my desired RPM and battery requirements.
<br /> I did have my eye on the Scorpion 30-14's. Are you rolling your own Drew?
Electric combat is so darn nice I just hate to have to go back to slimers.
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I roll my own to get a KV that matchs my desired RPM and battery requirements.
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Here`s a pic of a couple of Ammo motors, I think you can read the numbers.
The larger one (36-50-1500kv) is suitable for Open B. It has 100 more kv than the motor that I ran this year, and weighs 1/4oz more (about 8.5oz) I just ran it on an 8/4 APC clone on my cheap ($80) 5s2p 4500mah lipos and got a little over 20k at 50a. These numbers are almost identical to what I`ve been getting all year on the Quannum Drive motor from Hong Kong.
The really good news is that although Tower Hobbies lists a non-sale price of about $70. They must not be selling, because they have them on their web site for $35 each.
If you want to give Open B electric a try, I`d recommend this motor. I plan on buying several more at that price.
Add a $35 esc and an $80 battery, and you have a good powerful set-up at a pretty reasonable price.
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The prop looks to be a copy of the APC 8/4 sport prop. I bought it from United Hobbies (now Hobby City). I think it was $1.50, maybe less. It`s well made, and looks to be nylon with some kind of reinf fibers inside, like the APC.
They were out of stock the last time I checked, but I`ll buy more when they are available. This is the prop that I ran at my last contest in Houston, ad I was very happy with the performance. They are very smooth, have no sharp edges, and don`t need ballancing.
The prop adapters shown were bought from Hi Models in China for about $3.50 each. They have a steel shaft which really grips the motor shaft once you tighten it. It stays put when you need to change props, but can be removed with some tapping when needed.
http://www.himodel.com/electric/Aluminu ... _M7.8.html
For the price, I don`t see how you could beat it. I`ve had very good luck with the in runners that I used this year. Didn`t damage any in B, but did loose a couple in SSC due to midairs.
They were out of stock the last time I checked, but I`ll buy more when they are available. This is the prop that I ran at my last contest in Houston, ad I was very happy with the performance. They are very smooth, have no sharp edges, and don`t need ballancing.
The prop adapters shown were bought from Hi Models in China for about $3.50 each. They have a steel shaft which really grips the motor shaft once you tighten it. It stays put when you need to change props, but can be removed with some tapping when needed.
http://www.himodel.com/electric/Aluminu ... _M7.8.html
For the price, I don`t see how you could beat it. I`ve had very good luck with the in runners that I used this year. Didn`t damage any in B, but did loose a couple in SSC due to midairs.
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From my experience with other similar motors like the HiMax 3630-1500, it should hold up fine. I do use a HiMax heatsink $6, which helps dissipate the heat from the windings. I`ve done extended bench runs with no excessive heat, funny smells or magic smoke.
I`ll be running it tomorrow in some simulated combat heat runs (5min+ at 50a). I`ll let you know how it does.
I`ll be running it tomorrow in some simulated combat heat runs (5min+ at 50a). I`ll let you know how it does.
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I ran this motor several times yesterday at 18.5v and 45a, and it looks good. There was some heating of course, but nothing too bad. Using the HiMax heatsink seems to keep the motor happy.
Good rpms on an 8/4 prop MA or APC. It might pull a 9/4 on less V and more A, but then you`d be going way over the suggested A limit. An 8/4 seems to be all the prop that motors of this size can handle at high rpm.
Good rpms on an 8/4 prop MA or APC. It might pull a 9/4 on less V and more A, but then you`d be going way over the suggested A limit. An 8/4 seems to be all the prop that motors of this size can handle at high rpm.
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I ran these motors at the contest last weekend in Florida.
The temps were in the 80`s and it was fairly humid. The Ammo 36-50-1500 performed great, giving me aprox 21k at 50a 18.5v static on the 8/4. Although I was not the fastest plane, I was plenty fast enough.
I did damage one motor. I cut the tail off of Grasshoppers Avenger. The impact knocked the back cover off of the motor. This allowed the shaft to rub on the windings or perhaps short out. This either shorted out the ESC or burned it out from over amping it.
There was some smoke and a small flame as the ECS burned out. I thought that the Lipos had been hit, but it was the motor/esc. I switched out the motor/esc and competed with the plane later in the day, after a quick test flight.
Scratch a motor and esc, but that`s combat. This is the only power equipment that I lost while flying the 42 heats of Open B that I flew this year.
The temps were in the 80`s and it was fairly humid. The Ammo 36-50-1500 performed great, giving me aprox 21k at 50a 18.5v static on the 8/4. Although I was not the fastest plane, I was plenty fast enough.
I did damage one motor. I cut the tail off of Grasshoppers Avenger. The impact knocked the back cover off of the motor. This allowed the shaft to rub on the windings or perhaps short out. This either shorted out the ESC or burned it out from over amping it.
There was some smoke and a small flame as the ECS burned out. I thought that the Lipos had been hit, but it was the motor/esc. I switched out the motor/esc and competed with the plane later in the day, after a quick test flight.
Scratch a motor and esc, but that`s combat. This is the only power equipment that I lost while flying the 42 heats of Open B that I flew this year.
I found some clamshell motor mounts with cooling fins that will fit the 36mm motors very well. http://www.maxxprod.com/mpi/mpi-29b.html Scroll down to the bottom of the page. This page also has the himax heatsink that Lee is using.
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