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Post by flydiver on Sept 25, 2012 0:32:11 GMT 1
I can see where you would get that from the Horizon/Hobby Zone part description. So, I'll let be....mostly. It does attach to the bulkhead/firewall so could maybe considered to become part of the firewall, especially since it's glued on. The definition of firewall is that barrier between the motor and the cockpit. I don't see where a cut-out piece like that is any part of the definition. For those that care to understand a bit more what is being discussed here you might look at this: www.aeroelectric.com/articles/Firewall_Penetration/firewall.htmlThen there is the issue of 'motor mount'. To me it seems like that's the thing the motor mounts to, eh? Sounds sensible somehow. Here's a bunch: www.headsuprc.com/servlet/the-MOTOR-MOUNTS/Categoriesand more: www.customrcparts.com/index.php?main_page=index&cPath=1_2_3&zenid=h525i6ftrb6nbguimfu2nqqv33These guys make 'em so I hope they know what they are called. In this stock Cub case it would seem to be that bit of plastic. But who am I to call Horizon wrong? (ACT anyone?) We're fretting about definitions here. The important part is that stupid little plastic part is a PITA and has to be checked after a crash WELL, and replaced properly or you suffer the consequences. That part is certain. Renard-glad the rubber bumper mod is working for you! Good deal and good thinking.
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sdg111
Flight lieutenant
Posts: 85
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Post by sdg111 on Sept 25, 2012 19:04:34 GMT 1
Thanks folks, sorry for the two posts, wasn't sure if it had logged properly.
Fly, to be honest, as a newbie, I have no idea if the motor or ESC (what does that stand for and what exactly is it?) are okay. Only time will tell when I put it all back together. I hope not, half a dozen flights and I feel Like I'm re-building the thing already Grrrrr!
Re the terminology, clearly we all know what we're talking about but it does get confusing if people call things by different names. Hope you guys all hang about 'cos I have a feeling I'll be looking for advice if she doesn't fly right after the repairs are made....
Once the parts arrive and it's all screwed together, I do a test flight and report back, could be a few days depending on post and weather.
Steve
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Post by flydiver on Sept 25, 2012 19:46:58 GMT 1
ESC = electronic speed control - the throttle response. This can be confusing with the Cub since they combine the ESC + RX in a proprietary 'brick' as it's sometimes called. In normal planes the ESC and RX are physically separate. [rant] IMO this is HZ way of 'sticking it to you'. There is no way they need to make it this way. On some of the micros, I can see it. For the Cub, nope. Makes you have to buy an expensive double part when you burn up the lousy ESC they put in the Cub. [rant off] ;D Combined with the ESC, but as a separate device, there is a BEC=battery eliminator circuit. The ESC portion controls the throttle and LVC=low voltage cut-off. The BEC LOWERS the higher power battery voltage down to the 5-6v required to power the RX and servos. An ESC does not have to have a BEC, but something is required to power the RX and servos. You can actually do that with a small 5-6v battery plugged into the RX. That's what the nitro guys do. The electrics already have apower battery so the BEC was added to eliminate the battery for the servos + RX > battery eliminator circuit....get it? There are aftermarket BEC's that you add on to do the same job that are of higher quality and output than the built in BEC's. When you get to higher servo requirements, especially with Spektrum, you need to know that. Read this-it'll probably be confusing at your current level but you'll want to know about it in the future. Bookmark it. supercubclub.proboards.com/index.cgi?board=rg&action=display&thread=1858Note - If you stop the prop while powered up (crash, tip over) this makes a short circuit in the motor and will fry the ESC almost immediately. Hook up all the electrics (minus prop). It should work normally. If not, you maybe fried the ESC. It's VERY common. This is assuming you hook it up right.
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sdg111
Flight lieutenant
Posts: 85
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Post by sdg111 on Sept 25, 2012 20:35:27 GMT 1
Thanks Fly. I'm pretty easily confused at the moment but will read and bookmark the links.
I originally took the spinner and prop off to check the prop shaft. However, prior to doing this, the motor and prop did turn and run, but clearly, unbeknown to me, were being hindered by the bent propshaft. Hopefully once the new motor mount and shaft are inserted it will run as normal - if so, i replace the prop and spinner then take her out for a test.
I'm not at all disheartened by the work. As you previously said, it helps you to get to know your plane. But I do want to learn to fly her properly as a stock Cub, before I even think about upgrading things - that would be a waste of time and money if I were to continue to crash.
Regarding the prop, I definitely throttled off at the crash(es). But do recall on reaching the plane that there was the whine of the motor, perhaps throttle wasn't fully off, but off enough that the prop wasn't attempting to turn when freed, if that makes sense.
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sdg111
Flight lieutenant
Posts: 85
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Post by sdg111 on Sept 25, 2012 20:42:35 GMT 1
renard80, I like your rubber mount. I'm happy to give it a try, or at least something similar as I don't have any spare tyres kicking about. My only worry would be about upsetting the torque thrust angle. I'm assuming so long as it is even, then that wouldn't be a problem?
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Post by flydiver on Sept 26, 2012 0:00:33 GMT 1
ANY amount of throttle on with a stopped prop can take out your ESC, even a little.
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Post by luvofthagame on Sept 26, 2012 1:23:58 GMT 1
That's true, that burning out your esc can happen in those situations, but she's a tough plane...I've stopped the prop many times in landing on high grass or taking off in wind when it hits a dip...still ticking like new...it can happen, but you should be ok...just do a range test, then throttle up and down for a minute or so on the ground, then go for it keeping in mind you want to keep it very level at half speed most of the time in case something does happen...good luck...
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sdg111
Flight lieutenant
Posts: 85
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Post by sdg111 on Sept 26, 2012 13:11:30 GMT 1
Thanks all. Parts have arrived. Screwing it all back together but wont be able to test until at least tomorrow due to work. I looked into the new black gearbox assembly and inside the long tube where the shaft goes I can see all the tiny washers pre assembled in the tube which were dislodged on mine, goodness knows how that happened.
Anyway, have popped in the two bearings, screwed it onto the motor, popped in the shaft, inserted clear spacer, bolt, cowl, metal washer bolt and spinner.
I popped in the battery and tested her on the bench. She certainly seems to be pulling okay, plenty of power it would appear. Tomorrow, if the weather improves (and only if the weather improves) I'll pop on the wings and take her out. I'm feeling pretty pleased that I managed to put it all back together okay (I hope).
Renard80, I haven't put on your mod yet, but when I can find some suitable rubber, will definitely do it, anything to save that firewall breaking.
Thank you all for your help and advice and hopefully I'll have some good news in a day or two when I get to test her.
Oh yeah, forgot to mention, now have a drawer full of glue, tape and assorted spares awaiting the next inevitable crash!!!!!!
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Post by flydiver on Sept 26, 2012 15:38:33 GMT 1
Good luck. You won't be the first person I've told; you come to the sport thinking to learn to fly. What you really end up learning is way more about glue, tape, and soldering than you ever imagined. Then you have to learn about the electrics. Flying is easy, the electrics take some time.
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Post by renard80 on Sept 26, 2012 16:38:00 GMT 1
renard80, I like your rubber mount. I'm happy to give it a try, or at least something similar as I don't have any spare tyres kicking about. My only worry would be about upsetting the torque thrust angle. I'm assuming so long as it is even, then that wouldn't be a problem? Hi again. Glad your repairs are progressing. Re torque - I didn't notice any great difference after my mod. Something else to bear in mind is that installing anything extra in the motor area may push the motor forward, possibly fouling the cowl. If so, you may have to enlarge the hole in the cowl. Great fun, this flying lark! You're clearly a cautious sort, which is wise, so I'm sure that you will wish to bide your time until the wind is calm before testing your rebuilt SC. The wait can be frustrating but it's not worth risking a crash or flyaway in unfavourable wind. Good luck!
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sdg111
Flight lieutenant
Posts: 85
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Post by sdg111 on Sept 28, 2012 20:00:41 GMT 1
Thanks Renard80. I'm going to head down to B&Q tomorrow, arrmed with my broken gearbox/motor mount to try and find a rubber washer which fits the screw holes. I saw the pics on your link. Looks a great idea so will give it a shot.
Test flight went well, just a small tendency to turn left. Fly has given me some tips to check for faults, which I haven't got around to yet, too busy watching the Ryder Cup, which at this moment is not going well for Europe!!
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