Posted by tspeer | Nov 05, 2017 @ 07:36 PM | 4,688 Views
The attached report presents the results of flight tests of a full-scale sailplane, the Lark IS-28B2. Appendix B describes the method for calibrating the pitot-static system, and Appendix D describes the methods for analyzing the performance data and estimating the performance under standard atmospheric conditions.

The typical method of testing the performance of a sailplane is to make a series of straight-line glides at different airspeeds, recording the speed, rate of descent, and altitude lost in a given time. From these measurements, a curve of descent rate vs airspeed can be made, and the speeds for best lift/drag ratio and minimum sink determined. The biggest drawback of this approach is the need for very calm conditions over the entire area used for the testing. Since the plane flies in a straight line, it necessarily covers a significant amount of ground, even when different runs are made in opposite directions.

This report develops a method for testing sailplane performance in turning flight. One advantage of measuring the performance in a turn is the aircraft stays in the same airmass throughout the test. This makes it easier to find and stay in a region of calm conditions so lift or sink do not affect the results.

The performance in turning flight is also relevant to flying in thermals, and the report shows how this can be used to determine the smallest or weakest thermal needed to maintain altitude.

Turning flight measurements are particularly applicable to measuring the performance of radio controlled models, because the craft can stay in close proximity to the pilot. All of the necessary data can be collected onboard a model using today's instrumentation and electronics.
Posted by marbelo | Nov 05, 2017 @ 05:01 PM | 12,096 Views
A new build thread! This time I will assembly a S800 reptile flying wing. The idea was to do a cheap build and use most of the spare parts (electronics) from my Caipirinha v2 flying wing (RIP). At the end of the day, the only thing that actually was used from the old wing was the flight controller, a mini APM 3.1, the power module, GPS and OSD… (not too much really lololol).

Actually, instead buying the kit version of the S800 reptile I bought the foam part. It is a good idea if you have all needed parts to finish the construction. Let’s jump to the part list:

- S800 Reptile foam only;
- 6 mm carbon fiver tube (bought from a local store);
- 3 mm glass fiber rod (bought from a local store);
- 3D printed motor mount;
- 3D printed ESC, Receiver and video transmitter covers (use the smaller one);
- 3D printed air vents for the upper latch;
- 3D printed vortex generators;
- Racerstar Racing Edition 2206 BR2206 1900KV 2-4S;
- Gemfan 7050 propeller;
- Racerstar RS40A V2 Dshot ESC;
- EMAX ES09MD Digital servos;
- 5v/3A voltage regulator;
- Mini APM 3.1 + power module + M8N GPS + micro minimOSD;
- Eachine Frsky XSR-M receiver;
- LC filter for video gear;
- Eachine TX 526, 5.8 GHz video transmitter;
- Foxeer XAT600M HS1177 600TVL CCD 2.8MM IR Blocked FPV Camera;
- Aomway four leaf CP antennas;
- Multistar 3S 3000 mAh battery.

This wing uses the same power system than my Z84 wing, very reliable and flexible. It can cruise at around 3 Amps, It will go fast, it will fly slow, and it has enough power (I have measured more than 200W at full throttle.
Posted by K5083 | Nov 05, 2017 @ 04:31 PM | 2,093 Views
Remember this stuff?
Posted by OrtisFlow | Nov 05, 2017 @ 04:07 PM | 1,849 Views
Greetingz readers,

It was a test, I got inspired from Sean FPV, but had none 6S battery :/

I had to make my own xp about it. So I did and there the result.

GoPro mount+GoPro is around 140gr more added to the kwad 493gr...

The props used was a mistake...

Shud have used 2 blades high pitched props...

Anyway 4S isn't enouf... 5S would be better and I intimately guess 6S would be just perfect...

Without GoPro mount and GoPro using Gemfan 5046 dual blade on 4S it's a bullet! But flight time reduced to 2mins...

I'll make some DVR footage soon...

Looks like you got an update from my Ridge Racer!

Have fun, go fly!
Posted by K5083 | Nov 05, 2017 @ 04:03 PM | 2,146 Views
Putting most of the planes away for the winter, and took a few photos of my 2017 fleet.
Posted by aben71 | Nov 05, 2017 @ 03:56 PM | 3,475 Views
Yay!My Vkar Bison is here at last I have had a couple runs on it so far and really like it.The truggy itself is great,I do have some minor complaints to the seller mostly it appears to be an 80amp version when I had ordered a hobbywing 120 esc vesrion,kinda need to research it more as the box it came in indicates two versions now,the bison with a 60 amp esc and the bison extreme which comes with a 80 amp esc and neither check box is indicated on my package.I also have a different controller than the one I have seen in reviews as there is no lcd screen on mine ,this may be a good thing as I have heard previous models have issues with the stock tx/rx and I have had no problems thus far.

More to come from me on this Bison for sure ,I will say I am really enjoying it so far ,here is a highlight video of some run time I have had with it

Vkar Bison Park Fun Run Highlight Video Clips (2 min 45 sec)

I bought my Vkar Bison here
Posted by | Nov 05, 2017 @ 03:34 PM | 1,950 Views
As you may know the big Chinese hobby retailers are running a number of specials RC specials leading up to 11.11. I've picked through and listed all of my favourites which I have some experience with:

Posted by Thomas B. | Nov 05, 2017 @ 02:19 PM | 5,408 Views
We had a great day with some guests, very interesting models and nice combat.
Ein Tag bei den Rohlmannfliegern (4 min 23 sec)

Posted by CopperIodide | Nov 05, 2017 @ 02:00 PM | 15,427 Views
Hello guys!

I am finally taking the time to write this brief review. I may edit here to add more detail as necessary and avoid spamming this thread too much.

TLDR : The Vendetti Split 3 is an excellent frame for the runcam split and probably the best currently, although it still has room for improvement. Great video footage WITHOUT soft mounting is produced (check video for proof).

Long read :
I was looking for a frame with a low center of gravity, top mounted battery, runcam split support (30x30mm mounts) and 3 inch propellers.

I first spotted the Vendetti but it had 20x20mm support only. Since I really liked the design I asked Stef if it made sense for him to produce a variant for the split. He was very generous in spending the time to design a variant for the split and I quickly ordered 2 frames from his armattan submission. Stef even bothered to produce a frame quickly and sent it to me early within Europe. I have now 3 frames and will assemble at least 2. This post is about the very first build and how great it came out, although with challenges.

Part list :
Gemfan flash 3052
Dys 1306 3100kv
HGLRC F4 Flame
Armattan ESCs (4x)
Tattu 4s 650mah
Runcam split v1
R-XSR receiver
Atx03 vtx
LCD and buzzer module
Vendetti Split frame

The build can be challenging when keeping the low profile. There is almost no extra space in the main body. The FC and split board already rise the middle section to its optimal height ( battery middle at the...Continue Reading
Posted by Pat Lynch | Nov 05, 2017 @ 01:34 PM | 3,823 Views
The rush and bustle, not to mention the total disruption to my life over the last 18 months or so has been the reason for not updating this blog recently Inevitably, life issues, especially a new life in another country has meant that my modelling went into limbo for a while. After nearly two years since the passing of my dear Liz, I have found total happiness and a renewed reason for being 'normal' again so here we are looking at another chapter in the great adventure we call 'Life'.

Back to modelling. I had moved back to my home country of New Zealand principally to be among family after my wife passed away but it has proved to be much more interesting - a new partner, a new workshop, some new projects on the go and best of all, a new lease on life.
I have three models - one flying, one getting close to finished, and of course, a much more ambitious project in the very early order - Peter Rakes little WEL-10 getting me back to stick twiddling; Peters He51 started a few months ago is being covered and painted, plus a very ambitious 1/5 SE5a from a Gary Sunderland plan. And, of course, several ideas in my head about is allowed to dream.

We have bought a new house with plenty of workshop space, a large sports field nearby for casual flying and the local Flying Club only about 10 minute's drive away. The biggest downside is having to restock much of my consumables that I'd given away before leaving Australia. Sourcing new supplies such as wood, rubber tyre material, paints etc has been tricky but most things are available from local mail-order stores which, in this smallish country, can provide an almost 'next day delivery' service

The other thing that has made me happy is seeing my beloved models being continued, finished and flown by various folk who took them on. It is very satisfying to know that the hard work and passion that was expended is being continued. Thanks guys.

I'll add some pictures here shortly but the sun is up, the day is fine and a huge Spring garden beckons.....

Posted by Knoll53 | Nov 05, 2017 @ 12:05 PM | 4,027 Views
Well, I have been bitten by the PSS bug and am going to throw my hat in the ring and try to design a PSS ship that will fly at my local coast cliffs, which is modest lift most days of the year. This will cut out the typical PSS ships that you see on RCG with their wing loadings of 25 oz/sf. and up.

The trade off between the desired high speed and the ability to float in light lift will make it less fun than the lead sleds that race around at great slope sites. My little 32” span CP-1 at 17 oz./sf. and is quite the pig. It cannot even do a loop in modest lift.

If I go with 60” span, low AR, and a 11oz/sf wing loading, I could fly all year round and simply load up with ballast when needed. But that wing loading would be hard to hit with a fiberglass scale fuse and heavy skins on a foam wing. I am thinking of a Mig 3, so it is quite the chunky wing. With my normal construction techiques, it would probably be about 20oz/sf.

Wondering just how hard I need to work to make it flyable and fun for my local site.
Posted by BruceRF | Nov 05, 2017 @ 11:59 AM | 1,368 Views
Hi All,
Im an old newbee.!
Just got back into RC.
Catchup time.
Got a brand new 2000mah batt.
Whats the best first charge time with mains trickle charger?
Then the best charge cut off voltage when charging?
[email protected]
Thanks all.
Posted by phil alvirez | Nov 05, 2017 @ 10:38 AM | 5,652 Views
there is a point in life-and in modeling-that, as Kenny Rogers in the song, you need to know when to run.
once you have reached certain goal, or when you are satisfied with what you have or do, why try something else?
or when you no longer can do something, or dont enjoy doing it anymore

Kenny Rogers - The Gambler (2 min 54 sec)

i have reached a point where i cant find anything else to learn about modeling, or have anything to do but fly my planes.
and that is a great thing because, after all, the main goal of this hobby is flying-or whatever specialty you do-and enjoy your model.
so, life is good anyway.
Posted by ariaAQ | Nov 05, 2017 @ 10:29 AM | 29,692 Views
Good quality motor for big copter, with long wires..

Here's my thrust test video, tested several months ago, sorry about the lighting

DYS BE5208 330kv Brushless Motor Thrust Test 6S 1755 (2 min 37 sec)

Manufacturer Specifications:
KV: 330
Configu ration: NP
Stator Diameter: 52mm
Stator Length: 8mm
Shaft Diameter: 5.0mm
Motor Dimensions: Φ63x30mm
Weight: 200g
No. of Lipo Cells: 3-6S
Max Continuous Current: 28.2A
Max Continuous Power: 626W
Internal resistance: 0.106Ω
Posted by beaujack | Nov 05, 2017 @ 10:01 AM | 1,609 Views
Good afternoon all, i need help selecting a servo that has adequate torque and speed for my model, i have an alfa models micro p-51 mustang, the instructions recommend 3 gram servos but unlike other alfa models does not give the minimum torque requirements (does say not to use linear servos) i would like to use the lightest servos as possible, below i have put all the info i have on the control surfaces, auw of airframe etc and the servo i would like to use and also a youtube link to a video of the model, if someone can help me out with what i need, i would be very grateful

Wingspan: 460mm/18.11in. Wing area: 3.7dm2/ Weight: 65 grams/2.3oz. Motor: 7gram 2000kv brushless outrunner. Elevator: 165mm/6 1/2" width, 2mm thick at leading edge, 14 area, 6mm deflection up and down, pushrod controlled. Ailerons: 90mm/ 3 1/2" width each, 3.5mm thick at leading edge, total area 23.4, 6mm deflection, both ailerons controlled by single servo via two pushrods.

Here is the servo i was thinking of using; Tactic TSX1.9 coreless Weight: 1.9g Torque: @4.8v Speed: 0.04sec/60 degrees @ 4.8v

Here is the youtube link for flying characteristics and general speed envelope:
Alfa Models Micro P-51 Flight (2 min 2 sec)

Posted by vincent123 | Nov 05, 2017 @ 09:22 AM | 3,046 Views
Using my router to the extreme !

Routed some lead formers as nose weight, some 100gr, fits nicely!

According to my estimations at least 100gr are needed to balance the plane to the targetted CG.

So why not securing it during the build, no glue required.