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Posted by limmacslim | Mar 19, 2014 @ 01:20 PM | 6,203 Views
UPDATE: The frame is now built out of 10mmx12mm timber & weighs around 30g, I also changed the FC to an arduino pro mini with gy521 breakout board, the motors are still at 1900kv but with a delta termination this time so the copper is really packed in there . This is how it turned out in the end but I don't have any recent video of it, one of the motors was loose in this (old) video so it was not flying right at the time.
I do like this setup, nothing is overly stressed out & it gets a decent flight time. In static tests each motor was drawing around 6A from the 10A esc's, im guessing its a bit lower in the air. The lipo's always come down quite cool & have had plenty of use with no puffing etc.

My little Multiwii acro quadcopter (3 min 12 sec)

These are my first proper steps into the world of multiwii.
It took a while to loose the vibrations & get the board setup right, it still needs some fine tuning but I think I will build another lighter frame using either thinner wood or maybe carbon rods. This frame is a little heavy but crashes well .
Its been feeling a bit gutless recently & may be due to a motor mount not being totally straight anymore.

Poor mans wooden X frame, 15mmx18mm timber from b&q. Lots of glue & tie straps along with some v949 led's.
Multiwii (2.3) crius lite v1.0 board (from hobbyking)
M1822 motors currently at 1900kv
H-KING 10a ESC's flashed with Blheli
5030 HK props
1000mah-1300mah 3s lipos
Frsky radio gear.

My first multiwii quadcopter (4 min 19 sec)

Posted by limmacslim | Aug 22, 2013 @ 06:03 AM | 7,597 Views
I have not built one of these for a while, I normally fly them at parkjet wingloadings with high kv motors but I tried to get this one a bit floatier. The motor is a 2000kv blue wonder (running cool) spinning a 7x4 prop at 18a. I have some wing rock at high angles of attack which I am experimenting to find a cure.

Im not too great at it but only realized yesterday it does a pretty nice rolling harrier thats an odd one for a pusher jet lol.

Turn the speakers down, its loud.
Onboard RC Sukhoi SU-35 foamie (4 min 51 sec)

No rolling harriers in this one, just some messing around.
Sukhoi SU-35 depron RC model (4 min 22 sec)
...Continue Reading
Posted by limmacslim | Jul 24, 2013 @ 03:31 PM | 7,918 Views
This is my Marchetti SF-260, It has a box type fuselage & NACA0013 wing, its based on drawings found at Mostly made from 3mm depron & powered by another rewound blue wonder, something like 2000kv pulling 18-19a from a 1000mah lipo on a not very well balanced 7x5 prop, 360g AUW.

It doesnt look it in the video but its actually a tiny bit quicker than our other higher kv park flier sized pusher jets & consistently edges away from them. Its not really my type of thing but thought I would have a go at a semi scale warbird type thing.
At times it feels like a baby to fly but has retained some characteristics I have read about regarding the full scale aircraft. In a stall it is not very well behaved, there is plenty of warning but it really needs the motor spinning to keep it in the air & only comfortably cruises at a relatively high throttle setting even though I went for a low-ish wing loading, someone else noted its either flying or falling & this model is pretty much the same.

Marchetti SF-260 depron RC aircraft (2 min 42 sec)

Posted by limmacslim | Jul 22, 2013 @ 03:40 PM | 7,121 Views
This is my Sbach 342 profile foamie made with 6mm depron, its running a 1200kv strong power motor, 8x6 prop & 450mah 3s lipo, I will be chucking in a blue wonder soon.

Its very floaty & easy to fly, I am still a learner with the 3d stuff & this is turning out to be a nice little trainer. I wanted small wing fences & pretty much borrowed the shape from another sbach design. I have made some slight modifications to my plans so a mk2 will be on its way when this one dies

The landing gear is not very well supported & did come a bit loose after my rough landing, you gotta try though

Sbach 342 92cm depron RC model (4 min 10 sec)

This is a 58cm mk2 micro version. Turn your speakers down, the acoustics in the hall is terrible & there is a loud crash at the end.

Micro Sbach 342 depron RC model (1 min 25 sec)
...Continue Reading
Posted by limmacslim | Jun 24, 2013 @ 05:38 PM | 7,273 Views
Here is a short vid of my latest little flying machine, a 92cm slick 540, I am still messing with the CG & radio settings so the flying is not too adventurous.
Its a bit of an upgrade from a shock flier & is very simple to build with only 4 parts to the fuselage, I do see it as very similar to a shockie just with some added good bits, i may add a couple of ribs to the fuselage to help keep its shape while gluing together, structurally its fine the way it is. Because of the simplicity its not really intended to be entirely scale looking, just slightly.
I have been flying a 250g 6mm depron shockie version of the same profile (with 3x 9g servos) & always wanted to upgrade it to a full fuselage with airfoil wing, my perceived issues were the added weight. The 3mm depron, 4x 5g servos & lack of tail wheel kept the weight down to 255g & once glued together it is structurally much stronger than a floppy sheet of 6mm depron. The fuselage design was borrowed from a "donut models elite pro" micro, the main wing has a NACA 23012 airfoil & flat 6mm depron stabilizers (I may try NACA 0015 or similar for the mk2 slick). It was designed in google sketchup & the profile was traced from the image in the slick 540 user manual.

A feature of this plane is its rewound 1300kv (13T) blue wonder motor which is only getting luke warm after some decent abuse, its drawing 11.5a on a 8x6 TGS slowfly prop & 450mah 3s 25c gensace lipo. It hangs on the prop at 40-45% throttle & has enough thrust to pull out of just about anything. All my worries of building a slouch have been quelled, it flies ridiculously slow & with the new motor feels more punchy than ever, the airfoil gave a noticeable increase in speed with my old tired stock motor & the rewound one does feel a bit quicker.

Upgraded RC Slick 540 (2 min 27 sec)

Posted by limmacslim | May 25, 2013 @ 04:51 PM | 7,114 Views
Phase two has commenced & I have been trying to make the blue wonder go faster .
Its running at around 32-33A & didnt blow up , I had one running at 35A+ before but sympathy set in this time & I think rather than pushing it I should see how reliable (or not) it is running how it is.

I have 2x 1000mah 3S gensace lipos on now instead of one & could barely feel the difference in weight, the wing area & loading is excellent on the Eurofighter.

Eurofighter RC foamie with 32A "high kv" blue wonder (3 min 14 sec)

Posted by limmacslim | May 18, 2013 @ 01:20 PM | 8,284 Views
This concoction of foam, tape & wires flies! Its always nice when a maiden flight goes without a hitch. Seconds into the flight, the first prototype lost control quite high up then after not being able to recover crashed nose first into the ground in spectacular fashion. An elevon control horn came loose, with it being undersized & quickly hot glued on it was due to my negligence really (pic of depron destruction underneath).

After some late night cutting, gluing & with much stronger control horns it flew beautifully!
It pitches smoothly, has quite an extreme roll rate (needs expo) & rudder does not do anything too crazy (even though its right in the prop wash) but works well mixed with the other controls in a turn.
It is easily quicker than other similar pushers I have flown on this setup (BW 3000kv, TGS 4.5x4.5, 1000mah), also very manageable. Me & Pete built some beta planes to test & were chasing each other around doing full throttle passes 10ft or so above the grass. Its very smooth in high alpha, nicer than our last F22, SU35 & T50's. My high kv motor & small prop are not great for high alpha & Petes larger plane with 2212-06 2200kv motor & 6x4 prop seemed smoother. Pete also had the canards working with the elevator, it didnt appear to give any more pitch authority & only stabilize pitching even more.

Pete put his plane down & picked up the camera so this is me flying my blue wonder version. My initial CG estimate was quite nose heavy. This is the 4th lipo/flight & after some shifting of the battery its still a bit nose heavy, I want to go back a little more.

Eurofighter RC parkjet depron profile foamie (2 min 40 sec)

Posted by limmacslim | May 11, 2013 @ 11:44 AM | 8,421 Views
This is my profile Eurofighter (620mm wingspan) which has not flown yet, right now it has a 3000kv BW motor, TGS 4.5x4.5 prop & 1000mah 3S gensace lipo.

Im hoping this jet will be a bit more slippery, I flattened down the cockpit & nose slightly, the vertical stabilizer is also a tiny bit shorter. Im not entirely sure what to do about the canards, if the Maiden flight without them is good I may remove them. I do want to make them work at some point & explore the control side of things but right now I have some pretty obnoxious ideas for this plane, it involves more kv & less drag , I was in 2 minds to make up a underbody but decided to keep it simple for now.
This one is pretty much a prototype, I expect more load on the wings with a heavier/faster setup & will also use a carbon rod through the span of the main wing to stop them bending.
The lipo is well forward which I dont like, 2000mah will sit further back. I am glad I did not hang the motor/prop off the tail as I originally intended, would have ended up needing a lot of ballast.
Posted by limmacslim | May 11, 2013 @ 10:44 AM | 7,190 Views
Thought I would start keeping track of my fixed wing foamie projects, this way I have a record of their existence before the inevitable final meeting with the ground/tree/goal post, like this. (the slick did live on with a patched up tail)

Whoops (0 min 27 sec)

I am a fan of simple & quick profile builds, not just because of the obvious but I find I fly them in a much more carefree way, the lack of drag & weight also are big reasons.
Most of my aircraft are simple builds that I have drawn in sketchup. Im all for sharing the plans if anyone fancies building one, I just dont like cluttering the forums with half cooked beta designs. I prefer to get some flight time & confidence in them before someone else unwittingly builds something that has errors etc.