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Post by flydiver on Mar 20, 2011 18:26:48 GMT 1
Yes-making SURE surfaces are moving right is critical. I watched an experienced GLIDER pilot try to get his Funjet going and keep dorking it until he broke the nose off. When He finally checked with me I found he had the elevons backwards. He didn't have a chance.
With surfaces passing through the air REALLY FAST!!! it doesn't take much movement to make a BIG control effect from a tiny input. EXPO is very nice (almost critical), and Dual Rates can be extremely useful.
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Post by higgsbosonman on Mar 31, 2011 0:37:21 GMT 1
just a suggestion, but that parkjet would be great with THRUST VECTORING!  i'm putting that on my next airplane... |
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Post by pauliepilot on Apr 1, 2011 15:18:40 GMT 1
How about a swift flying wing?easy to build easy to fly gr8 night flying fun! And it can take a good bashing for around £40 then motor radio 1000 lipo!!  |
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Post by Dillzio on Apr 23, 2011 11:43:37 GMT 1
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Post by flydiver on Apr 23, 2011 15:39:49 GMT 1
Be aware that an EDF unless built well and right is nothing more than an inefficient tiny prop moving very fast in a tube. On good planes built well they can work OK. On this super inexpensive stuff the motors are likely nothing more than a great way to turn lipos to toasters.
My buddy got a cheap EDF jet (one of the F9 Panthers-not sure which one, there's a bunch). Looks OK in the air, flies a.....little bit.....faster than a stock Cub at WOT. Eats a 2200 lipo in 4-5 minutes. These lipos don't live long flogged like that since they need to be run at near full tilt all the time. It improved marginally upgrading the ESC to 40A and putting in a better lipo.
My similar Funjet eats his EDF alive and does it while sipping on the same size lipo. Neither one of us is impressed with it.
I'm not saying they are all bad, some are OK but do some serious homework before buying any of them.
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Post by toff on Apr 23, 2011 21:08:14 GMT 1
Just my tuppence worth. I've flown my multiplex twister on both a 2200 3s and a 2300 4s. Flight times are about 10 minutes, and its a ROCKET! At WOT it eats up the sky, and can go to a dot in no time at all. Really I should be using a 3300 to 4500 mah, but the budget only stretches so far  . My little depron pusher jets are quite slow in comparison, but I have to admit, they are more fun, as I don't have to concentrate quite so hard! |
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Post by ginginho on Apr 23, 2011 21:47:57 GMT 1
Just my tuppence worth. I've flown my multiplex twister on both a 2200 3s and a 2300 4s. Flight times are about 10 minutes, and its a ROCKET! At WOT it eats up the sky, and can go to a dot in no time at all. Really I should be using a 3300 to 4500 mah, but the budget only stretches so far . My little depron pusher jets are quite slow in comparison, but I have to admit, they are more fun, as I don't have to concentrate quite so hard! Didn't know you had a Twister, very nice. I've had an eye on one of those for some time. |
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Post by toff on Apr 23, 2011 23:39:09 GMT 1
I really should do a 'hangar' shot, since my stable seems to grow, and I don't mention what I've got. might as well, 'cos I've got no time to fly at the moment |
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Post by killioughtta on Apr 24, 2011 5:47:50 GMT 1
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Post by ginginho on Apr 24, 2011 12:53:36 GMT 1
Horror story that Erwin. He even had safety glasses on, something that most wouldn't bother with in their ignorance. I'm with you on stearing away from HK stuff like EDFs. A tried and tested manufacturer would be my way into those (MPX twister, Phase3 stuff etc.) |
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Post by Dillzio on Apr 27, 2011 13:41:27 GMT 1
I've decided to go with your recommendations of the funjet, it looks like a really nice buy, and has gotten fairly cheap since the funjet ultra came out. My reading on EDFs also suggest that they're not such a good choice for your first jet. what do you think of this motor for the funjet?: www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=7993I like the look of the Turnigy 2836s, and I figured that since lower KV motors are more efficient than higher KV motors, I'd be better off with the 2350kv version than the 3200kv version... If you look at flitetest's video on youtube of 100mph for 100 dollars, you'll see that the motor they used in their final pusher jet was only 1600kv! Fly, you mentioned that you have a FJ. I was just wondering what the biggest prop is that can go on it, is there an upper limit? -thanks |
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Post by flydiver on Apr 27, 2011 17:36:40 GMT 1
That's a pretty popular motor. I assume you found this thread? www.rcgroups.com/forums/showthread.php?t=1213360100mph is awfully fast. I recently started flying mine on 4S with a stock Stryker motor and 5.5x4.3 prop > maybe 80+? Not sure, never measured it. It gets small so fast I'm thinking about going back to 3S and a 6x4. Easier to launch and keep up with. Not sure I'm cut out for the 100+ club. There is no prop size limit but functionally as they get larger torque becomes a launch issue (twist, dive and dork) along with catching the prop on landing and ripping stuff up. I've broken 1 prop in 2 years but never flown larger than 6" prop. Don't think I'd go over 7" and with that motor you wouldn't likely exceed 6". There are 2 basic approaches: 1. Lower KV and higher cell counts 2. Higher KV and lower cell counts Stuff around 2000KV gives you the most flexibility it seems. Higher price motors like Mega will handle the heat/load better than the Turnigy for pushing the limits. As the speed increases the power requirements soar. Therefore the cost starts to go up exponentially and the stress on the airframe needs to be taken into account (flex, servo strength, etc). That's the reason for the new FJ. |
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Post by gagallagher04401 on Apr 27, 2011 18:23:32 GMT 1
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Post by flydiver on Apr 27, 2011 19:38:14 GMT 1
That appears to be quite a bargain WITH the FJ. The motor is a suppo 2212-6. The SuperV2 sounds like one they may have made special for better performance, likely wound with larger wire if true.
The ESC is.....basic. Not sure I'd put in in a really fast jet. OTOH lots of folks do. The FJ only has to handle 2 servos (low BEC draw) and often the throttle is full on or mostly off and coasting/cooling down. It's not a huge work load for the ESC or very sophisticated requirement.
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Post by Dillzio on May 8, 2011 5:39:38 GMT 1
Ging, Fly, thanks for the advice on the Funjet, I've decided that's the bird I'm going to go with. I'm also getting the $10 upgrade kit from Parkflier Plastics. This is my cart from hobbyking to go with the kit, look pretty reasonable to you? 1 OK PLH-002 - UltraDetail Scale F-14 Pilot Model (29x2.. $5.46 15 2 OK MA5545 - Master Airscrew propeller 5.5x4.5 (2pc) $5.24 38 2 OK 19-502-4mX10 - Prop Saver w/ Band 4mm (10pcs) $7.48 78 2 OK GS0164 - Prop adapter w/ Steel Nut 1/4x28-M4mm sh.. $3.16 34 6 OK HXT900 - HXT900 9g / 1.6kg / .12sec Micro Servo $16.14 108 1 OK T2836-2350 - Turnigy2836 brushless Outrunner 2350kv $16.32 135 1 OK TR_S40A - TURNIGY Sentry 40amp Speed Controller $18.99 65 2 OK GON-D4T6 - Propeller Adapter (Colet Type) 4MM $2.08 50 1 OK 18-00301x10 - Spare Rubber Ring for Prop Saver (10pcs) $2.04 9 1 OK GW-V-TAIL-J - GWS V-Tail Mixer II (200 step) $8.01 40 5 OK TGS6x4E - TGS Sport 6x4E Precision propeller $2.94 180 Total: $87 + $15 postage Funjet kit + Parkflier Plastics kit from www.hobbyzone.com is $83 + $20 postage You may notice I wasn't sure of the best way to fix the prop to the shaft, so I've got prop savers, colet adaptors and grub adaptors in the cart. I'm actually going to use my super cub batteries to power the thing, zippy 2200mah 20Cs. Looking on their reviews they seem to be good for up to 40a, from some fiddling around in drive calc it doesn't look like the props i've picked will draw more than 35A. Oh, and I already have some spare receivers for my HK-T6A. |
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i'm putting that on my next airplane...
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. My little depron pusher jets are quite slow in comparison, but I have to admit, they are more fun, as I don't have to concentrate quite so hard!
