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Old Jun 29, 2012, 01:21 AM
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Micro Plane Foamies Scratch builds?

Looking at the eflite UMX Sbach 342 BNF I was thinking, it would be cool to have more of these size planes (especially for indoor).

Has anyone made their own scratch builds this size?

Sure parts that are light enough could be difficult to find, but what about these?prices seem "reasonable??"

Parts from the Sbach: http://www.horizonhobby.com/products...nf-EFLU4180#t4

Also, aren't there some 3gram servos somewhere on hobbyking?

I could see it possible to get the wingspan for a plane down to a mere 12" or less (delta wing = more area).

Any thoughts?
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Old Jun 29, 2012, 01:39 AM
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Australia, QLD
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Hobbking sells all the micro stuff, all in one boards http://www.hobbyking.com/hobbyking/s..._one_5ch_.html
Motors http://www.hobbyking.com/hobbyking/s...em_combo_.html
Module for you radio http://www.hobbyking.com/hobbyking/s...em_combo_.html
But i would like to see the lightest setup possible without going micro.
Mick
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Old Jun 29, 2012, 01:41 AM
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I bought two of there 2.5 gram servos and they are rubbish, they wont center in the same spot, but they were only a couple of dollars
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Old Jun 29, 2012, 01:48 AM
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Aren't the brushed motors weaker than brushless??? Where can you buy motors smaller than 400 (standard ones that you find in out park flyers, and RCSuperPowers).

I found that RC Timer has those linear servos too: http://www.rctimer.com/index.php?gOo...6&productname=

ESC 6Amp: http://www.rctimer.com/index.php?gOo...6&productname=

I could see these competing with 120SR and mCPX helicopters
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Old Jun 29, 2012, 02:10 AM
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Sure, you can buy a motor at 3-4 grams and a esc at 1 gram, its just the receiver and servos i am not sure about, i will have a look through HK's site for something.
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Old Jun 29, 2012, 02:55 AM
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well, i have some of those microflite spectrum park flier receivers. pretty light there.
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Old Jun 29, 2012, 06:31 AM
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been looking at some of the micro stuff from hk

1.7 gram servo

Turnigy 5A 1S Brushless ESC

AD-C5 Micro Motor 4.6g Weight 3700Kv

FrSky VD5M 2.4Ghz 5CH Micro Receiver w/Telemetry

1 cell battery 4 gram- 8 gram 130mah-200mah

so 2 servos + receiver + motor + speed control + battery = 15 gram - 20 gram

not bad i think
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Old Jun 29, 2012, 06:50 AM
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I built this out of micro servos and motor but standard receiver (3 channel) and ESC (6A):

http://www.rcgroups.com/forums/showthread.php?t=1570412



Admittedly with an 18" span it's a bit larger than UMX planes but it flies beautifully.

I've since recycled the hardware and built this 13" micro aerobatic delta:

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Old Jun 29, 2012, 07:07 AM
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There are dozens, possibly hundreds, of scratchbuilds, mostly using the Spektrum AR6400, described over in the Indoor and Micro forum http://www.rcgroups.com/indoor-and-micro-models-85/

Start with the thread index http://www.rcgroups.com/forums/showthread.php?t=84771

Steve
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Old Jun 29, 2012, 09:07 AM
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United States, FL, Davenport
Joined May 2012
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I'm building a biplane with a 12.75" wingspan. I got the bits from hobbyking.

12A esc: (overkill, but the reviews showed good BEC capability) http://www.hobbyking.com/hobbyking/s...dProduct=11429

1811 2000kv motor. comes with connectors, shrink tube, prop saver, prop adapter with spinner, wires are shrink tubed out of the motor. All for under $10!: http://www.hobbyking.com/hobbyking/s...idProduct=8613

hobbyking 3.7g servos - purchased these based on their reviews. Haven't hooked them up to see their functionality: http://www.hobbyking.com/hobbyking/s...idProduct=5459

orangerx 6ch receiver - this is 9g with the orange case on, but remove the case and it becomes 3g. the case is easily removed. The aforementioned all-in-one supermicro units look nice but they do not bind to anything but a supermicro radio or one with a radio module. I have a dx6i, this 6ch orangerx receiver works with standard JR plugs, and it's only a gram or two heavier than the 4ch orangerx receiver with submicro jst ports. It was worth it to me for ease of use to go this route. The prongs on the receiver are relatively heavy, since I'm only using 5 of the 7 (one for bind plug), I could probably desolder two of them for a bit more weight savings but that's too much hassle. Plus, the 4ch is $9.99 and this 6ch is $5.99.
http://www.hobbyking.com/hobbyking/s...dProduct=11965

Brushed motors might not put out the thrust of the brushless but they will do the job just fine for something this light and small. I have 2 P51 micros, one mini-air from nitroplanes and one parkzone um and they both have brushed motors. With how cheap the power systems are from HK though it's worth it to go the brushless route.

In addition to the above links to the products I purchased, also picked up two 180mAh 2s lipos, and the total cost for the electronic parts ran approx $41. Combine that with a $0 airframe (all made from scrap refuse from the house), well it's a good deal!
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Old Jun 29, 2012, 10:33 AM
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http://www.hobbyking.com/hobbyking/s...Receiver_.html
I use this 2 gram rcvr with the 1.7 gram servos in this Cutlass. 5 gram motor swinging a 5-3 prop on a 360ma batt. Weighs 1.7 oz WO batt. Made of $ Store foam. 17 in. span.

Gord.
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Old Jun 29, 2012, 12:54 PM
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Not down to 12" but in the 20" range, these three are from half sheets of DS foam, and use 2gm servos, HK 3ch rx, c10 type motors.

http://www.rcgroups.com/forums/showt...1#post20276674

http://www.rcgroups.com/forums/showt...2#post20292010

http://www.rcgroups.com/forums/showt...8#post20488483

with real micro gear, one could probably cut the size in half again.
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Old Jun 29, 2012, 02:35 PM
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Quote:
Originally Posted by flypaper 2 View Post
http://www.hobbyking.com/hobbyking/s...Receiver_.html
I use this 2 gram rcvr with the 1.7 gram servos in this Cutlass. 5 gram motor swinging a 5-3 prop on a 360ma batt. Weighs 1.7 oz WO batt. Made of $ Store foam.


Gord.
I have seen this a few times on other posts, it looks awesome gord, do you have a link to a build log or some dimensions, I have a 20 gram 2300 kv motor sitting here, scale it up a bit and make one
Mick.
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Old Jun 29, 2012, 03:04 PM
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"Fraid I don't Mick. I took a 3 view and blew it up to the appropriate size. Made the wing a little wider than scale chordwise. You can see the carbon spar 3mm by 1 mm across the wing. A U shaped wire joins the 2 piece ails. Other than that, the rest is just foam with the paper taken off. Assembled with hot glue. On 3 cells it goes like snot. No slouch even on 2.

Gord.
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Old Jun 29, 2012, 09:56 PM
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Georgia, United States
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Gord, That is a nice Little Cutlass So, you blew up a 3 View to have a 17" wingspan and then made the wing cord wider. How much wider did you make the wing cord? Also where is the CG located? See, this is what happens when you build a very neat simple model and then Post it on RC Groups Thanks for sharing the Cutlass with us guy's

Bobby
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