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Posted by Peter petrolhead | Today @ 09:46 PM | 3 Views
Hi All , well i have finally decided to bite the bullet and build my own old timer plane i found the plans on the Outerzone site and down loaded them on to my stick and then enlarged them to full size. the construction is fairly basic, I have not built a model for quite some time ( 35 years) , so at this early stage i have bought the balsa wood ,which was a hassel as imperial sized balsa is not freely available in South Africa in addition to this i have packed the wood and bought it to Angola where i work , My intention is to build in my off time . First order of the day is to construct a workbench with a flat surface so far i have scrounged some angle iron and a bit of flat steel from the mines scrap yard and i have built the basic frame work next is to fabricate some shelves and cuboard space , then i can really get down to some building.
Posted by Jack Crossfire | Today @ 09:33 PM | 20 Views
It seems like it shouldn't be a big deal to design a constant power supply for a rover. It just needs the same standard current sensor that every RC plane has. 3D Robotics actually donated a current sensor with integrated 5V regulator. The problem is the rover is too small to fit it anywhere.

Sadly, regulating power by making PWM proportional to voltage didn't work. The idea was higher voltage at lower duty cycle would be equal to lower voltage at higher duty cycle, but power still increased with increasing voltage. The motors aren't constant resistance for all voltage & there's an unknown power usage from automated steering. It wasn't as effective as a linear regulator, which was still not true power regulation.

3DR uses an INA169 current sensor, which is an op-amp calibrated to convert the voltage difference across a 0.0005R resistor into a known voltage range. Their current range is 90A, while the rover needs 2A.

That leaves building something out of a 1R resistor with an op-amp. The maximum voltage drop should be 2V with a maximum current at 2A, but it's actually PWM with the maximum current an unknown higher amount for a shorter duty cycle. Then the PWM result needs to be smoothed.

They limit the bandwidth with a .1uF & 110k described in the datasheet. Using 1/(2piRC) gives 14Hz. Your best bet is to probe the resistor output & smooth it as much as possible with a big cap.

Constant power remanes a bridge too far for something which also needs a suspension system. Some waveforms showed nothing abnormal.

Deriving PWM purely from voltage, no load, at 12.5V we have .19A 2.38W



At 10V, we have .20A 2W



At 9V, we have .24A 2.16W


As usual, the frequency response of the probe makes suspect voltage ranges.

With constant PWM for all voltage, we have

12.5V .43A 5.3W
10V .37A 3.7W
9V .33A 2.97W

So voltage derived PWM is better than nothing, in the normal voltage range.
Posted by myrcmodel | Today @ 09:05 PM | 36 Views
The price of the hobbywing platinum 30A PRO for multicopters reduced to $15.99 now! It is really a good news.

http://www.hobby-wing.com/hobby-wing...m-30a-pro.html
http://www.arrishobby.com/esc-for-mu...icopter-p-2534
Posted by SilverBullet126 | Today @ 07:16 PM | 165 Views
Built a better temp FPV solution (see pic). Smoothed out the footage a lot.

Parts list from HK, GetFPV and ReadyMadeRC all ordered Now just gotta wait
Posted by dlearnt | Today @ 07:10 PM | 158 Views
Nice and sunny for a change but a bit windy. Going for speed but ran out of room pretty quickly.

Playground 2 (3 min 42 sec)

Posted by Kurt | Today @ 06:46 PM | 198 Views
After ~50 flights decided to dress up the X a bit with wing-tip laser cannons and some panel lines. Knocked at least 5mph off her top speed but she sure does look cooler swooping around.
Hoping to bring her, the P-38 and F-82 to the B.E.S.T event in 2 weeks but with a baby due next Friday it could be tough to get away for even a few hours :/
Posted by blade strike | Today @ 06:29 PM | 190 Views
S900 H3-3D Mounting Plate
Posted by shigetyann | Today @ 06:01 PM | 227 Views
Hi all

I tested new camera mount that absourbs fast vibration.
It worked good. God smooth views.

Hope you enjoy this video

Shige

ST MODELS DHC-2 BEAVER float-plane version test shot (4 min 25 sec)

Posted by paco2008 | Today @ 05:52 PM | 234 Views
Fpv my opinion (8 min 48 sec)

Posted by Suenaga | Today @ 05:23 PM | 265 Views
Today's Flight Ops with my SAFE Rx equipped Airfield Zero 1440mm wingspan (57 inches) on a gloomy Southern California morning. A bit of a bounce on the landing, but she flies and handles really well.

Jim

Airfield Zero over Loma Linda Sept 21, 2014 (3 min 13 sec)

Posted by DesignGeek | Today @ 04:39 PM | 289 Views
Could be a winner. Can't wait to fly the ravine down the middle.
Posted by ww2collector | Today @ 04:38 PM | 292 Views
A nice little museum in Cape May, NJ. Original WWII wooden hangar. Some nice aircraft including an F14, MIG 15, F16, Shooting Star, T28, Several USCG helicopters. Took my daughter and she really had a great time! If you are down there with the family. Stop in.
Posted by Barney Boy | Today @ 04:32 PM | 280 Views
Here is the 747 at Evergreen , it's a lot bigger than it looks from the road..

https://www.youtube.com/watch?featur...P3qzT2Nz8lhofg
Posted by rab | Today @ 03:53 PM | 322 Views
Spent an enjoyable morning at PGRC. Some flying some chit chat. The maiden flight of my Dragon Rapide went flawless, just about the only thing on that plane that has gone flawless. Note the flaws are due to me, I should have picked a simpler kit for my first stick build. Anyway it flew very well. Another guy with a roadster about twice as old as mine showed up to check out the field. Early morning was still, as the morning went on some light termals formed. Might have been a good day to fly the glider. But I choose not to bring it because fitting the Dragon in the car is challenging, not so much because of it's size but because of its fragility.
Posted by Fyathyrio | Today @ 03:50 PM | 375 Views
My most recent round of motor testing included the two motors in the title, and the same test equipment and procedures as noted in my first batch of motor testing.

First, let's discuss the EMAX motor. First impressions are very positive, the motor comes in a nice reusable box and it's cradled in a comfy foam bed. This is important as the various postal systems around the world have a habit of smashing packages and not worrying about damage to the contents it would seem. Every other 1806 and 2204 motor I've tested has been delivered in a tiny cardboard box that has no structural integrity to protect the contents, and with no padding at all. Besides the nice box and padding, there is a selection of M3 mounting hex screws and an included hex key wrench to fit them. EMAX did not include bullets or a mounting bracket, some other motors do, this is only important if you need these items for your build. Since most mini quad motors are bolted directly to a CF frame arm, the lack of bracket saves you a little money in initial purchase price, and is available from EMAX if needed. Also, since they use the relatively standard M3 on 16 & 19mm centers, you can likely get some from a friend whose motors came with the brackets like I did. Bullets are also an optional item in many builds since a lot of builders like to direct solder to the ESC to save weight, are crazy cheap in bulk, and I find no fault in not including them.



The big difference between the EMAX...Continue Reading
Posted by Brian Owens | Today @ 03:28 PM | 359 Views
Hi I am Brian Owens I have built many kits from cars,trucks,boats, snow cars both nitro an elctric tanks gas boats! But ready to fly so my first build is the kyosho pby flying boat! I have not started yet but should be soon. Looking forward to it.
Posted by Late99 | Today @ 03:02 PM | 383 Views
I guess it's time to wrap up my current fleet. This introduction will be divided into several blog entries, let's begin with my primary flyers...

"Primary fleet":

E-Flite Eratix 3D
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Description: Eratix 3D.
Oldie, but goldie. I've been flying a lot with Eratix this summer. I got it second hand in the end of June. Clocked over 7 hours of real flight time (86 sets of batteries) during last three months. I love how easy it is to land - even on our quite rough field. And it hovers so nicely... Only problem during whole summer was that I ripped rudder hinges, fortunately emergency landing was successful. Rudder was fixed by gluing hinges better with thin CA. Eratix is powered by 3548 Turnigy motor turning 1100kV. It flies on 3S batteries and has around 650 Watts power. Eratix has been really valuable for me to learn both 3D and precision aerobatics. It's a 3D plane, but the size and stability has made it really good and versatile plane. It has been used even for training my friends with buddy box setup!
See video.

Ion Pro, 2m hot/warmliner
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Description: Ion Pro 2m warmliner.
Even much older than Eratix... I wanted a glider type plane that has flaps so that I can practice proper glider controls & crow / butterfly flaps. It's powered by brand new 3548 700kv motor that I got for 5 euros. Can't go cheaper than that. I'm running it on 3S batteries and getting around 450 Watts of power (with 16x10 folding prop). Fast enough for my practicing purposes. Could change smaller prop and use 4S batteries for more...Continue Reading
Posted by eirlink | Today @ 03:01 PM | 391 Views
Ive a short video here which i made to show you all how the CP gimbal controller performs during a torture test i put it through...
the footage speaks for itself. this is straight from the SD card.
enjoy !

Gimbal is a Walkera G3-3D, with gopro 3 black fitted. I threw away the stock walkera controller and fitted the CP.
To put things in perspective i mounted a keychain cam on the frame .



CP Test 210914 (2 min 1 sec)

Posted by randall_l | Today @ 02:46 PM | 449 Views
Got out for the maidens on the Fokker DR.1 and GeeBee R3 instead of eating lunch.

I flew the Junior to warm up and toodle around the sky a bit. Over 60 hours(and still counting) of slow-flying goodness.

Next, I tossed the Fokker DR.1 into the air... YES! A successful maiden and second flight. A couple circuits to trim and I started getting used to how it would behave to my input. The 3 ailerons that accompany Steve Shumate's plans for the DR.1 make it a very capable 3D plane. After I paint it and add a bit of weight to the nose, I think it will reside in (or near) my Grab-n-Go rack.

Then came the GeeBee R3... not so much. The first toss ended with a roll-left and nose-in. The second toss (more straight/level and less up) and I could tell from when it left my hand that it was tail heavy--boy, was it ever! I maxed out the rates and tried to get it down to the ground in one piece. The only damage was a crease on the bottom-front of the cowl.

I had used the CG from a similar sized (60mm shorter wingspan) and scaled it to my GeeBee's size. Obviously not even close. I'll try again once I add some weight in the nose to move the CG forward until it feels right.

Now, some lunch and time out of the sun.

Cheers!
Randall