Posted by old4570 | Today @ 04:14 PM | 7 Views
What is cooking a motor ?

In a nut shell , it is when the motor gets so hot that electric current goes to generating heat rather than forward thrust .
This may or may not , result in thermal run away !

When electricity goes to generating heat , it means power is taken away from thrust resulting in diminishing returns .
This may be hard to notice in a quad or plane until the motor dies ..
But on my test stand it is noticeable almost right away as I can monitor RPM / Thrust / current ...

Thermal Run away ! ( A really good way to kill a motor )

Again , electric current goes toward making heat rather than thrust .. In a thermal run away situation , the motor begins to slow down ( lose power ) and just get hotter and hotter till the motor seizes ( stops ) or dies ( damaged ) . On the test stand I can pick up on this almost immediately ..

As I slowly increase power , RPM / thrust and current climb . Once a peak is reached only current might go up , that extra power being fed into the motor ( if it takes more power ) is most likely going into manufacturing heat .. And as the motor gets hotter it begins to slow down ...
The faster this occurs ( seconds ) , the more likely that the motor may go into thermal overload .

It would be very difficult to pick up on this without the ability to monitor the motor properly ..
A way to avoid such would be to match your motor ( KV ) to the battery ( voltage ) and prop you want to run .

...Continue Reading
Posted by kenelder | Today @ 01:37 PM | 48 Views
Here is an old article concerning wing to tail incidence as well as biplane wing alignment. It is done in Q&A format.

Q: What is incidence?
A: Incidence usually refers to the angle of attack of the wing when compared to the horizontal stabilizer. For an airplane to be stable in pitch, the wing should have a small angle compared to the tail. The angle is called positive when the leading edge of the wing is higher than the trailing edge. The angle is negative when the leading edge is lower than the trailing edge. For aerobatics, the incidence angle is usually zero: the wing and tail are at the same angle of attack.

Q: What incidence angles should be used on a biplane?
A: Model biplanes are usually designed with incorrect incidence angles. It is typical for a model biplane, such as the Sterling Stearman kit, to have slight negative incidence in the forward (top) wing and quite a lot of positive incidence in the rearward (bottom) wing. The wings are not parallel to each other.

This causes extreme flight problems. When the rearward wing is at a higher angle of attack than the forward wing, the rearward wing will stall first. When the rear wing stalls, the airplane will pitch up rapidly and try to enter a spin. This was demonstrated recently at our field on the test flight of a new biplane. Also, at high speeds the wings fight each other and the plane tends to suddenly pitch up and down.

The correct incidence for a scale biplane is to have a slight positive angle of attack in the forward (top) wing compared to the bottom wing. This way the forward wing will stall first and the nose will drop to recover – the airplane will be stable.

For an aerobatic biplane, the wings should be set at zero incidence so everything stalls at the same time.
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Posted by unboxingexp | Today @ 12:02 PM | 61 Views
TPU printed parts for FPV drone (2 min 21 sec)

Printing yellow TPU parts for my TBS Source One budget FPV quadcopter build.
Posted by UnknownForces RC | Today @ 11:42 AM | 66 Views
Motor quick release of Ghost Rabbit GR1 (0 min 16 sec)


Motor quick release: The first gear stage (which is normally inside the center transmission housing) is only slipped onto the motor. No screws in the pinion required.
Posted by UnknownForces RC | Today @ 11:34 AM | 65 Views
Center gear box of Ghost Rabbit GR1 (0 min 16 sec)


The center gear box will feature a quick release for the motor pinion, no screws which may come lose are required.

Currently the front, center and rear gear boxes are not fully assembled yet, because we're still waiting for a few parts to arrive. Some parts for the differential locking mechanism have to be CNC machined, a square hole requires wire cutting for a precise result, some other parts are still in the plating process. The manufacturing takes a lot of different steps, so please be patient and bear with us.
Posted by torben19888 | Today @ 05:26 AM | 331 Views
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Posted by phyngineer | Today @ 02:41 AM | 362 Views
On November 3, the power transmission and maintenance personnel of China's Shandong Yantai Power Supply Company used drones to conduct drone inspections on the entire line of 220 kV bamboo line. This is the 24th and 220 thousand inspections of drones this year. Volt line. Up to now, Yantai Power Supply Company has completed the inspection of the 1817 tower drone and found 161 common defects and 38 pin-level defects. The inspection efficiency and equipment defect detection rate of transmission lines have been greatly improved.
 
This year, Yantai Power Supply Company actively promoted the transformation of transmission line inspection from "man-made inspection" to "personal inspection + machine inspection", focusing on the development of drone pilots, equipment upgrades, and exploration of new modes of inspection. Force, 16 people have the Civil Aviation Authority multi-rotor UAV visibility in the line of sight, equipped with 34 types of multi-rotor drones, has formed a multi-rotor patrol tower, fixed-wing patrol channel models Inspection mode, drone inspection work has a qualitative leap in terms of personnel quality and equipment quality.


 
At present, Yantai Power Supply Company has set up an unmanned aerial vehicle inspection team in each transmission and transportation maintenance team to use the drones for daily patrols, special inspections and fault patrols of the squad. At the same time, a professional inspection team was set up to...Continue Reading
Posted by aero nishi | Today @ 01:15 AM | 396 Views
This time with three "Mini"s.
RC Factory/Twisted Hobbys "Mini" automated air race (0 min 49 sec)

Posted by Catherine Chen | Yesterday @ 10:04 PM | 448 Views
Hello Everyone,

This is Catherine from Dongguan QS Electronic Tech Co.,Ltd.

QS8 Antispark connector want to share with you.

Plastic Material:Nylon with fiber
Flame retardant rating:UL94 V0
Temperature Range:-30℃ to +150℃
Metal Material:Gold Plated Brass
Weight:36G/SET
Max Wire:6AWG
Rated Current:70A

Any question,Please feel free to contact me: [email protected]

Best Regards,
Catherine
Posted by RC Roundtable | Yesterday @ 09:32 PM | 460 Views
Episode 95.2: "AMA Expo West - Part 2" is now live!
http://rcroundtable.com/podcasts/mp3...isode_95_2.mp3

In this episode, the gang chats with four special guests who all attribute their current high-tech careers to RC roots!
-Introductions (2:35)
-The gateway drug (13:15)
-Musical runways (28:00)
-The student becomes the teacher (33:15)
-Homage (36:30)
-Closing time (46:00)

You can visit our website at RCRoundtable.com to listen over the web or download an MP3 of the show. Or, you can subscribe to RC Roundtable on iTunes.
We would love to read your comments and ideas. Please drop us a line here, on twitter, or via email: [email protected].

You can visit our website at RCRoundtable.com to listen over the web or download an MP3 of the show. Or, you can subscribe to RC Roundtable on iTunes.

We would love to read your comments and ideas. Please drop us an email: [email protected].
Posted by armen424 | Yesterday @ 08:00 PM | 93 Views
Does anyone know if my USB Controller (https://www.hobbypartz.com/79p-tm612...ator-6666.html) will work on later editions of Real Flight???
Posted by mike81156 | Yesterday @ 06:26 PM | 512 Views
These fidgit spinners have pretty good bearings in them. Works really well.
Posted by scousethief | Yesterday @ 01:37 PM | 552 Views
https://www.banggood.com/custlink/KD3D0MG8ZH



As a long time single screen FPV'er I would be interested in seeing if the IPD/dioptres on these are any wider/better than the Fatsharks. The 1280x960 is of course very welcome but 1280x1024 would be nicer, especially for connecting to as PC and using the HDMI connection to create a VR headset for PC Gaming or for simple video playback.

Specifications:
Frequency: 5.8GHZ
Frequency range: 5333—5945 M Hz
Receiver Sensitivity: ≤-93DB
Antenna impedance: 50Ω
Audio and video: AV in/out
Video format: NTSC/PAL
Brightness: Adjustable
Contrast: Adjustable
Pupil Distance adjusting: 56-72mm
Focal length adjusting:Under 800 degree of myopia and Hyperopia 300 degrees
Eyeglass frames: astigmatism/ myopia/hyperopia(Diopter lens not include)
Power input: DC 7.4V-28V
Minimum voltage: 6.8V
Operating temperature:-10C ~ 40C


Package Included:
1 X EV300D goggles
1 X Zipper case
1 X 18650 battery case
1 X Sponge
2 X EVA pad
2 X Eyeglass frames
2 X Third party module cover
2 X FPV receiver
1 X Lens wiping cloth
1 X User Manual
Note: not included the battery and antenna


...Continue Reading
Posted by unboxingexp | Yesterday @ 12:33 PM | 555 Views
TBS Source One Chinese Replica (2 min 6 sec)

Bought this on aliexpress, but it seems to be not the original TBS product. However, I m still gonna build a budget 5" fpv quad. Stay tuned!
Posted by DutchRC | Yesterday @ 12:04 PM | 563 Views
Halloa people

sooo Diatone recently released a new variation of their micro GTR line and this time we got an actual DeadCat frame
It allso looks cool (IMHO) so I had to have one
Offcourse it is a Deadcat quad to keep them pesky propellors out of view

Link to the quad: GTR249T HD at Diatone's shop

Link to the quad: GTR249T HD at Banggood.com

spare props:
https://www.banggood.com/6-Pairs-Ema...p-1277632.html

And.. here is a first look at the quad With a LOS testflight

Diatone GTR249T HD - CineRacer? :) - Show & Tell (24 min 16 sec)


Specifications:
type: Cinematic racer
wheelbase: 115 mm
base thickness: 3 mm
material(s): Carbon fiber + allu + platic canopy
dry weight: 86 g
flight controller: Mamba F405 mk2
firmware version: Betaflight 4.0.6
ESC's: Mamba F25 mk2 25A Dshot600
motors: Mamba 1105 5500kv
propellors: 2.3 mm Avan (frame supports 2.5mm props)
FPV camera: Caddx Turtle V2 HD recorder
VTX: TBS Unify 5v
Lipo: 650-750mah 3S (not included)
OSD: Yes, Betaflight
smart Audio: Yes, TBS Smart audio
buzzer: Yes
LED's: Nope
spare props: Nope
Posted by FPV.Model | Yesterday @ 11:54 AM | 559 Views
Last chance!
Regular Price: $199.99
Now: $79.99
11.11 Flash Deal

https://fpvmodel.com/products/betafl...1-special-deal


Posted by SavageX89 | Yesterday @ 09:12 AM | 614 Views
As previously mentioned, my father-in-law and I started a Piper Cub kit build a few years ago. My life is finally in a place where I have some time to work on it again.

In preparation for this build, I reviewed the build instructions again and wanted to view the plans. Only problem, finding a digital copy of the plans to review remotely, without carrying around the actual plans, is impossible.

Enter: awesome job, awesome boss, and a large scale copier/scanner.

I work for a manufacturing company in North salt lake Utah as a Design engineer. My days are spent creating and modifying drawings that are regularly up to size D (24"x36"), sometimes larger. How convenient, that the plans for this Cub are D sized! After speaking to my boss and giving him an intro to this hobby and what I plan to do, he enthusiastically said yes to my request to scan the plans, and make an extra copy.

The best part of this, is I can now print out, on regular paper, small sections of needed. And with a digital copy, I can help others. I've seen posts on this forum regarding plans for this kit and I hope to be able to help those people out.
Oh, to go with this. So long as I'm at this job, I will be able to scan the plans for any kits I do in the future

As for the progress of the build, we have completed the rudder, elevator, horizontal stabilizer, and vertical stabilizer.
Pics will come with another post.

Note: I have contacted Great Planes/Hobbico/Horizon Hobby regarding these plans. No one there seems to know where to find an extra set of plans. Very frustrating.
Posted by decreale | Yesterday @ 08:16 AM | 609 Views
Be care full when selecting the propeller for you electric plane. I recently relied on a vendor’s suggestion (Master Airscrew) for one of my planes . They sold me a gas prop for an electric plane. The result was a disaster. Make sure it says made for electric planes.