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04-18-2010, 01:19 PM | #21 (permalink) |
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CA is fairly brittle stuff, so you can sometimes loosen it by wiggling, but you hope you never have to do that. Make sure everything is perfect before you screw things down. If you have to remove them, sometimes you have to put a new piece of wood there, so it's not a good idea to do that.
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04-19-2010, 11:59 PM | #22 (permalink) |
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You ever apply some ca on the screw before you finally fasten the system down? That might make for a rather permanent installation of servos.
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04-20-2010, 10:23 PM | #23 (permalink) |
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Yes you can definitely do that, and it will hold it for a long time. If you use the rubber grommets and mount everything properly, it will hold up very well over time, just don't let it get cold - CA gets really brittle in the cold.
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04-23-2010, 12:05 AM | #24 (permalink) |
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Where are rubber grommets used?
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04-23-2010, 02:10 PM | #25 (permalink) |
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On some servos, there is a rubber vibration dampener which can be mounted on the holes - they really do help to protect the mounting surface from any damage during flight.
Look in the small photo in the middle of the page here, and you can see two rubber parts and two metal sleeves which form the vibration dampener. Sometimes the smaller servos do not have these. http://www3.towerhobbies.com/cgi-bin...?&I=LXTRE2&P=M
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04-24-2010, 08:55 AM | #26 (permalink) |
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Thanks. Now back to the motor- prop- battery combo question: I now have a Watts Up meter and understand how to pick a prop that does not pull more watts than the mfg of the motor recommends. Also I noticed the amp draw and did not want that to overwork the esc. So how does someone select a battery for a particular set-up? For example I have a 490 1140kv outrunner that recommends up to 450 watts and mentions the esc range, prop sizes, model weight ranges, number of battery cells etc. What about the mAh and C rating of the battery (mainly mAhs)?
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04-24-2010, 02:53 PM | #27 (permalink) |
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I usually pick a battery which can supply 1.5 to 2 times the max amperage I plan to run. So if my plane pulls 20 amps, I need a battery that can supply 40 amps. The C rating is different from different places - I find that the lower quality batteries can be a bit optimistic about the C rating... so while one 20C 2200mAh battery may be able to run a 44-amp setup just fine, another brand will get hot and puffy in that situation. So, to be on the safe side, I don't run anywhere near the max rating of the battery.
There's only a few capacity ranges available, so you pick one that give the right weight and also enough amp rating to supply your setup. If you need to pull 40 amps for example, you wouldn't want the 1300mAh because even a good one will only be capable of 30 amps or so (if it's 25C). So, the next size up is 1800, and at 25C that could give 45 amps, but remember I like to run with a bit more margin - so the next size up is 2200, which at 25C is good for 55 amps, so it would be about right. It is a balancing act, and it's sometimes tricky to get the exact right combination.
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04-24-2010, 10:50 PM | #28 (permalink) |
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Hey Jasmine
You're making this very clear and easy to understand. Thanks very much! I'm going to try to absorb this info now for a day or two. |
04-24-2010, 11:24 PM | #29 (permalink) |
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No problem. If you fill me in on the entire setup, I can tell you what battery would be good, and why.
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05-02-2010, 12:09 AM | #30 (permalink) |
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Hey Jasmin
I bought a few motors that I thought were a good deal (Hoffman Magnetics) and I'd like a recommendation on which of the following motors would you install a mini ultra stick and Trojan T-28. The mini ultra has a flying weight of 22-25oz and the T-28 Trojan has a flying weight of 30oz. I have one of each of these outrunners: 470/1100kv- 470/1500kv 490/910kv- 490/1140kv- 490/1520kv- 490/1830kv. I bought them blindly kinda as I was not sure what I needed. The 470 motors pull 250 watts and the 490s draw up to 450 watts. Will these motors correctly fit these planes? I know this question of sort of redundant and I apologize, I'm just starting to figure out the combination of motor, prop,esc,.and battery. Thanks! |
05-14-2010, 01:00 AM | #31 (permalink) |
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Hello again Bob. I kind of forgot to check back on this thread.Im about in the same boat as you.Im learning more as I try different setups.Alot of it seems to be trial and error.Id say the motors you have are in the range of what you need and with a little experimenting and prop selection Im sure you can find one that works the way you like.
I do know that the stock Park480 on the trojan is around 200 watts.I think its like 960KV.With the stock prop it pulls about 13 amps so its not loaded much over 150 watts.Its not quite at 1:1 power ratio and wont quite pull itself straight up but its close. The lower kv lends itself well to larger props and more static thrust.The higher kv is better for a smaller prop going faster and will give better top end. I have couple trojans and parkzone spitfires and I run them on 2200 25C packs.Im mostly use the ones that are getting a bit wimpy for my 450 helis and they arent even warm after a hard run. Id get a wide selection of props if you havent already and just try them out.I got 9x6-9,10x6-9,11x5-9 and 12x5&6 for now.You have the watt meter to check the power loading and make sure your not loading the motor too much.Alot of different combinations work the trick is to find what you like for your style.The more I experiment the more I can wrap my mind around what I like for the way I fly. Not unlike nitros I found that there is a balance in putting more watts up front and the disadvantage of more weight.It might accelerate straight up and have piles of power but if the motor/batt combo is heavier it raises the wing loading and the sport flying characteristics can suffer. Im finishing up putting a 400watt on my #2 trojan Ill probably have to use my VX hyperions so I dont stomp the 25C packs but Ill just have to try it all out and see.Maybe go to a 2500 or 2600 mah if my flight times are limited.Then it might just be a heavy pig and I wont like it.I have another motor that is more like 250 watts and I may end up backing off and using that too.I had that motor in a spitfire and it went like a scalded cat until I snapped the wings in half during a hard pullup after a speed run. Ill let you know how it all works out. Good luck testing.That is kind of half the fun of it all for me. Scott
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05-20-2010, 02:17 AM | #32 (permalink) |
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Yeah Scott I'm looking at it like you now: testing is fun. You know kinda sorta what will and won't work and you try different combos. I just got a 49" kit from a friend and am deciding what motor and servos to install. That's part of the deal, being creative in your selections. I'll bet sometimes you get lucky and come upon a great set-up
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05-21-2010, 06:28 PM | #33 (permalink) | |
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Quote:
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Too many helis & Too many planks Lots of DX radios & A couple Futaba 72mhz radios AMA member & Full scale plank driver HELIFREAK !!! |
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