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Thread OP
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Eeek ... thanks Shawn. Nothing like a bit of pressure to generate "focus".
I was wondering though, do you think it would be better for me to dispense with rudder control and go with ailerons; or would this raise serious issues about the all-up weight of the model ? |
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I agree with Andy. My experience with smaller wingspan aircraft is that they can be blown around by small gusts and one wing can easily be lifted. Ailerons allow you to make fast and positive flight corrections.
Another reason to go with ailerons with your Spitfire is to keep the weight light on the tail section of the aircraft. Even though the aileron mechanism might be a bit heavier overall, at least it's only on the trailing edge of the wing (home made aileron control horns can be amazingly light). The control horn, hinge and pushrod for the rudder wont help a tail heavy aircraft. |
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Thread OP
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Thanks again guys.
Now on the question of motors again, I note that Speed 280s and 400s seem to be generally available in 6 and 7.2 v. What are the implications of selecting one over the other? Does it actually matter? Also, are there any advantages in using a so-called "race" motor? On the subject of airfoils, I note that the Guillow's is of the non semi-symmetrical variety (ie completely flat on the underside of the wing) which I assume is better suited to slow(er) rubber powered flight. Will this be ok? I would certainly prefer to just leave this aspect of the model alone if possible. Thanks |
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Thread OP
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Thanks Andy.
I've just noticed that Mark Rittinger used a 6V Speed 400 in his Python. Now are we saying that if I use a 280 in the Spit that it should be a 7.2V to get the extra torque, but presumably, that this isn't such an issue if you use a 400? |
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Probably.
I have a couple of the Guillows kits here to use as the basis for my own bashing projects. I plan on using 6V Speed 400 and 7xKR-600AE cells to power them. HS-81's on the ailerons and elevator. They will essentially be the same concept as the Python, just a bit more scale. I had no problem at all getting 16.5 oz for a ready-to-fly weight. Andy |
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Hey Clipper Kite,
I got a Flair mini classic Spitfire at a 27 " span FF kit which sounds about the same as what you have. It says that its completed FF weight should be around 3oz's.( 85g's) ( including rubber motor etc ) I bought it with the intention of making it RC. the gear I will use will be the GWS ips motor 9"-10" prop(pico light stick jobby) carbon brushed, those funky little 6g pico servos, GWS pico Rx, 2A esc and 7cell 250mah battery pack ( will also try 8,9 & 10 depending ) Aileron, Elevator, Throttle. That and a slightly more reinforced main spar. This initial setup should be around 190g which would be lighter than my 21"span "chopped light stick" biplane which flys fine on the above setup 5mins+ even flys well without bottom wings. One of the things I wanna do is put some micro retracts which might add as much 20g at most, but would look cool as But even so there should be plenty of power for ROG takeoff, or I just chuck more cells at it will also use carbon rods where possible for control rods, undercarriage etc. Also GWS do a twin motor gearbox combo which will fit if I really need the extra power without adding to much weight I expect success with this little project. Will post pickies when finished, flying ones too if I can Cheers Paul |
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I built a sterling Extra 24" auw 9 oz flew fantastic with a GWS S-2 motor on 8 cells the S-2 has a 3.5:1 ratio so the pitch speed is good with a 7x6 prop. I'm currently working on a Sterling Sukhoi 26" that I plan to use an Orion elite modified motor in spins the 7x6 about 700 rpm faster with the same amp draw as the GWS motor. If any one would like to see vids of my extra flight here is the link http://villa.lakes.com/storage/extraflight.mpg
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