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| Electric RC Helis Discuss helicopters, setups and power systems for electric helicopters. |
Topic Review (Newest First)
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| 07-23-2012 03:33 AM | |
| bensidus197217 |
Re: I now have an Align 450V2 how do you program the speed control? It would work but power usage would be a drawback. |
| 07-22-2012 10:24 PM | |
| Cougar429 |
Re: I now have an Align 450V2 how do you program the speed control? The only problem with your method is that you would lose the freewheeling ability with power reduction, (or complete loss). I had already thought of a larger freewheel drive gear, but have not found one that will fit within the spacing and allow for fitting the tail drive assembly with adequate tail belt tension. One really radical idea was to remove the freewheel gear and tail drive completely and driving the tail belt directly from a secondary smaller brushless with an ESC in governor mode. On top of that I was trying to decide how to come up with a tail pitch arm to allow for a stock tail pitch mech and have the rotor on the LH side for a more scale appearance. This would require a mirror of the stock pitch bellcrank. Anyway, a bit off the original thread topic. |
| 07-22-2012 08:40 PM | |
| bensidus197217 |
Re: I now have an Align 450V2 how do you program the speed control? Just a thought. You could drop the main gear down with a spacer sleeve between that and the main shaft bearing, slide both the main shaft and motor forward by enlongating the mount holes and then drive the tail rotor gear with the main gear. That would work and get rid of the tail blade gear reduction that is if the gears would mesh correctly. I don't know why they don't do that already except that it would really increase bearing speed. As you've seen from my posts I like to tinker and change things. |
| 07-22-2012 07:25 PM | |
| Cougar429 |
Re: I now have an Align 450V2 how do you program the speed control? I like them for the same reasons. On the build queue is a fully lighted scale MD500 for one with a SuperFrame. It's on hold till I figure out how to retain tail RPM with a reduced 5-blade head speed. |
| 07-22-2012 07:10 PM | |
| bensidus197217 |
Re: I now have an Align 450V2 how do you program the speed control? Yes I'm hoping to make this one last forever. I like the 450 because they are agile and I'm not so afraid to push my skills limit farther. Cost is also a huge factor and I can find scale stuff at a good price for a 450 as well. Plan on making my heli fleet all 450 size for cost and continuity you know one battery size spare parts to fit all. How do you like the 450 size Cougar? |
| 07-22-2012 07:00 PM | |
| Cougar429 |
Re: I now have an Align 450V2 how do you program the speed control? Good idea on the regular belt lubing. It make a huge difference. Along with that also look for some beeswax to lube the main and freewheel gears. It make a bit of a mess at first, but the amount thrown off is dry and will simply wipe or brush off. It does not attract dirt or other abrasives to wreak havoc on the pinion. That and a hardened pinion make the combi last forever. I just picked up some Mavrik belts for my 450's and will check their wear properties compared to the stock black rubber offering when I get the chance. |
| 07-22-2012 02:50 PM | |
| bensidus197217 |
Re: I now have an Align 450V2 how do you program the speed control? Thanks Cougar. I believe my home made landing gear is the big problem, I used it on my 500 and 600 but cut it shorter for my 450. The landing gear is 24 inches across with a 4 by 4 3/8 plywood squares holding the 1/2 inch dowels with waffle balls on the ends. I now have 1/4 dowels 24 inch long sandwiched together with 1/8 basa wood and no waffle balls, I'll also check for binding and lube the tail belt with silicon spray. |
| 07-22-2012 08:08 AM | |
| Cougar429 |
Re: I now have an Align 450V2 how do you program the speed control? You have to consider the power system together and separately. In simple terms, the system has to be able to provide enough power to meet demands and the limiting factor will be the lowest rated or capable component within that system. If any of the components, (ie. motor or ESC) are physically too hot to comfortably touch immediately upon landing then they are running close to or at max capability. A battery may not be too hot to touch, but if any puffing is evident that internal resistance is creating heat and out-gassing. This does nothing for reliability at all. One thing to consider is that brushless motors have a "Sweet Spot" RPM/Volt where they run most efficiently, (most I have tested come out in the low to mid 80 percentile). If loaded down to fall out of that range their efficiency also falls off dramatically. That means more amps will be required to give you the same power with that extra being dumped as heat. On the 450, if too weak a motor is installed, the wrong drive pinion is used, wrong blades or too aggressive a pitch curve for throttle, (usually shown with main rotor RPM lag with pitch change) or physical drag in any of the drive components that can be enough to load down the motor. The same thing can happen if the power system cannot meet demands, only in that case those other components will likely also be too hot to touch. Check the main rotor and tail drive spin freely without any power input. If they come to too rapid a stop then you may have the tail belt or shaft drive too tight. You need to also check the motor/main gear mesh. If you hold the motor or output shaft there should be just a touch of freedom in the main gear either way. p.s. In choosing power system components I frequently go by a rule we use in industry of factoring protective devices to 1.5X what we expect the max draw to be. That means if I expect a 30A max current I will look to no lower than a 40A ESC for reliability. The key is to try and max that capability with the minimum addition of weight. No need to run a honking big 100A ESC for that kind of app. |
| 07-22-2012 12:12 AM | |
| bensidus197217 |
Re: I now have an Align 450V2 how do you program the speed control? Thanks Guys it actually works now, don't know if it's set right but it works. Cougar that rev of the throttle was very helpful, likely my problem in the first place. This Align heli is in rough shape with bent flybar, mended frame, and bent linkage but stills flys as good my HK450 did. Motor seemed to get too hot, now my training is fairly heavy so I think that figures into it. Do these 450 motors get hot as a rule? I have a bunch of new parts on the way from Rotorquest so can't wait for those too arrive. |
| 07-21-2012 06:37 PM | |
| Cougar429 |
Re: I now have an Align 450V2 how do you program the speed control? Not sure if you have the fix yet, but a couple of things with Futaba I found over time. First is the need to run the throttle channel in REV direction. Second is that sometimes the travel, or ATV setting may need to be extended beyond 100% or reduced at the bottom to fit within what the ESC needs to see to get into the programming and actually set the options. |
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