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Post by ginginho on Apr 6, 2009 13:04:39 GMT 1
Since upgrading to brushless, the CoG of my SC has been at around 2.125 inches from the LE due to the motor, the mounting gear and also the ESC being mounted in the cowl.
I thought I'd try it with the CoG more in line with the original so after moving the ESC to the battery cabin area, it measured at 2.5 inches from the LE, being a tiny amount nose heavy.
The outcome of this? Well I flew this weekend with this new configuration, and although it flew much more like the stock SC, I found it far too floaty to what I had got used to prior to this change. It also seemed to struggle more in the wind.
Although my original setup means faster landings and more chance of a nose-over, any building time I have will be spent putting it back to how I had it before. This pulls so much better through the wind, and has nicer flight characteristic all round.
If you think you'd like to experiment by making your SC a bit more nose-heavy, be aware that this may not work with a stock cub. The extra power that the brushless setup I have provides, overcomes the tendancy to go into a dive constantly brought on by the nose heavy CoG. A stock setup is unlikely to have the oompf to do this sufficiently.
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tyefighter
Flight lieutenant
Beware the Cub eating tree
Posts: 46
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Post by tyefighter on Apr 13, 2009 1:06:02 GMT 1
I just did the upgrade to the 450 brushless, servos and rx and didn't change anything else. Boy was that a little hairy, had to tape a rock to the nose to give it some balance. Today I made a CG scale and added some landing gear from a PZ Super Cub and it was really close to 2-1/2". Flew two batts this afternoon and had a great time, even though the wind was fairly strong gusting to about 12mph. Almost lost it downwind but I remembered to keep the nose down and brought it back safely. I hate climbing trees to get it down. Might go out and fly the fresh batteries now.
Mike
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Post by admiralev on Apr 13, 2009 3:20:45 GMT 1
you brits are up to your old habits of flipping and adding letters to words again that just make them look goofy! centre?  admiral |
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Post by ginginho on Apr 13, 2009 8:55:35 GMT 1
you brits are up to your old habits of flipping and adding letters to words again that just make them look goofy! centre? admiral I did wonder if one of you yanks would pick up on that ;D |
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Post by alexinflight on Apr 13, 2009 14:06:23 GMT 1
In the Brits defense.....The language is called "English" and it would be my bet that the spelling of Centre has long been used/written before any of us Yanks ever decided to pen the word reversing the r and the e! LOL!
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Post by ginginho on Apr 13, 2009 15:07:03 GMT 1
A good point well made Alex. Although I will expand a bit on this. English spoken and written in Britain has evolved since the days of the population of America by Europeans and as such the written English in American is more akin to that spoken in olden times. Words such as "centre" have entered the English Dictionary over time with different spellings, in this case the spelling is originally based on French! We Europeans mixed it up so much in the past (English Kings of France, French Kings of England, etc) in such a way that pretty much every monarch in Europe was related to Queen Victoria in some way or other. So in summary, if anything the American use of English is the truer one if history of the language is taken into account. Of course, that doesn't make the spelling of "center" to be correct on this side of the pond!  |
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Post by admiralev on Apr 13, 2009 17:16:02 GMT 1
i was once told by a friend of mine from the isles that "we invented the language and you (americans) screwed it up!"
admiral
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Post by retiredbri on Apr 13, 2009 21:07:19 GMT 1
Hi all If it's any consolation to those on the other side of the pond, over here, we have a lot of problems with the spell-checker. My 3 penny worth (3 cents worth) In England, all the maps of the world show England in the cenTRE with USA to the west and Europe/Asia to the east. When I visited the States, I saw maps where USA was in the cenTER with Asia to the west and England to East. Perhaps, we should ask our "Brit" Administrator SCC to adjudicate ;D. Getting back to ginginho, I converted my cub to 2.4 GHz but stayed with stock 480 motor & gearbox and NiMH cells. However, before I could try it out, I broke the tail and then fixed it. After, it was very floaty but I put this down to being tail heavy (because of the fix). If it needed 0.6 oz to fix the tail where it broke then it would need 2.6 times as much at the bulkhead/firewall. In the end, I added 1.75 oz to the nose to get it to fly OK. Even with this weight, the Centre/Center of gravity is about 59 mm (sorry: 2 and 3/8 inch) back from the leading edge. I think it pulls well because the commercial ESCs are better than the old 27 MHz stuff. This applies to brushless or brushed with a gearbox. Mine still can go fast (not as good as LiPo and brushless) and can fly slow without wallowing around. regards Retiredbri |
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