Posted by edwen303 | Aug 10, 2019 @ 10:06 PM | 1,142 Views
When airplane rests in still air, the weight of drop tank is the only force upon drop tank. In flight, the force of air on drop tank will become important, which is the friction between air and moving drop tank. The combined force will exceed the gravity force.

How much force on the drop tank in flight? I propose a simple test, use leaf blower to blow on the drop tank.

Most leaf blower works at around 150 mph, and diameter of nozzle is pretty close to the diameter of drop tank in most 90mm EDFs. So if the blower blows the air to the front end of drop tank at close distance, we can assume the air speed on the drop tank is somewhat smaller but close to 150 mph. Those has pitot tube can actually very easily measure the air speed from blower to the drop tank. The farther away nozzle from drop tank, the lower speed of airflow.
  • Secure a bamboo stick or 3mm piano wire on upright position. Secure the drop tank horizontally on the tip of bamboo stick/piano wire. This may actually be challenging to achieve but I will just leave it like that for future whoever interested to explore in experiment.
  • Turn on blower and point the airflow toward the drop tank in a headon manner (simulate the airflow toward drop tank in flight), keeping the drop tank in the center of airflow. If drop tank has stabilizer, it is easier to maintain drop tank at the center of airflow. The drop tank will be blown away from the upright position, causing the piano wire to bend. Measure the average
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Posted by Fitz Walker | Aug 10, 2019 @ 09:51 PM | 910 Views
Pt. 1 of building and flying the Hagar 9 20cc P-47.
Hangar 9 20cc P-47 Build Review | HobbyView (23 min 28 sec)

Posted by ebear7 | Aug 10, 2019 @ 06:00 PM | 864 Views
thanks to all the replies i now have two bought.
Posted by slomofoe | Aug 10, 2019 @ 02:35 PM | 871 Views
Long time building balsa models.
I think the first was purchased at the science center in Toronto as a kid. The school i was in had a trip, and the main exhibit was aeronautics. From first flight to the moon. Needless to say i was hooked.
I got a model at the gift store on the way out. I think i paid 10$ and it wasn't the same kits you get today. No lazer cutout balsa, it was in sheets of balsa with the pattern printed on it. every piece had to be cut and fine sanded to shape. We didn't have the shrink plastic wraps to cover the plane, it was paper and dope to stiffen and shrink the paper, the glue now is fantastic, i would pin ans secure everything the glue it and hope it doesn't move again until it was dry.
I seem to have learned a thing or two since those days, but some one can always teach me something new. It's a small mind that closes doors to new ideas. Things i have picked up and taken to a new level; I didn't realize how important the center of gravity was early on, but quickly found out a plane will not fly or flies very poorly without taking that into consideration. The way a wing is built or centered can also play a big part in how well it will fly. A warped wing fly poorly at best. A balanced prop is a sweet thing, out of balance is unsafe and noisy.
Probably the main thing i have learned is not to get attached to a model because eventually it doesn't come down the way you would like. And that's not all about the pilot's skill. I've had a wing...Continue Reading
Posted by slomofoe | Aug 10, 2019 @ 01:47 PM | 872 Views
If anyone can help me please. I have many planes that are air worthy and many that need help. What i find most bothersome is a new plane that should be in the air, but i can't get it to fly for no apparent reason. This new opterra 1.2 It seemed like a good idea at the time but i am quickly regretting the purchase. I started with setting the transmitter the proper way and values on my spectrum dx8, got a good signal from the vtx set to 600 Mv. everything seems like it's going to be so much fun. But i can't get the motor to run, It beeps on start up like it has armed, and beeps again when it's in ready mode. safe seems to work, ( i tilt the wing and it tries to correct and level). I just can't get the motor to spin.
any help would be appreciated
Posted by GORZYCKI J | Aug 10, 2019 @ 01:17 PM | 840 Views
I flew my green/gold Grand Tundra the other day. The esc and motor both were burned up/trashed in the air and i couldn't recover before noseing it in and doing some fixable damage. My question is what motor should i use. I replaced the esc with a talon for the motor. I have a eflite 50 and 60 but do not know how to adapt/it looks like with a modified motor mount i might be able to use one of these motors. If i use a motor from Hk i would want to use a bigger motor that fits.
Posted by Drinkes | Aug 10, 2019 @ 11:55 AM | 977 Views
- 2000mm (balsa+foam)
- С3536 1450kv 500w Motor
- 40a 6S ESC
- APC 9x4,5, 9x6 Prop
- Emax ES09MA Metal Gear Servos
- 1500g flight weight with 4S 4000ma battery.

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Posted by Bazzboe | Aug 10, 2019 @ 11:51 AM | 844 Views
I have had to make the decision to close shop for a while due to health reasons and financial issues too.
Im not going out of business just having to finalize some aircraft kits and other work out of state and will not be available on a daily basis to work on new projects for now. If you have a project pending with us it will be completed ASAP and if you need something still contact me and i will see what i can do to help.
Thanks, Mike!
Posted by GroundControlRC | Aug 10, 2019 @ 08:03 AM | 963 Views
Flight #15 - King Kong/LDARC Tiny Wing 450 FPV Test Flight!

Here is a link to the Video:

This item is courtesy of Banggood.
I thought this Tiny Wing would make for an excellent Micro FPV Wing ;-)
It has several flight modes; 6-axis, 3-axis, and manual.
It's made from EPP Foam which should make it extremely durable ;-)

I installed a Micro FPV System and with the 2S 450mah 35C LIPO I use it puts the CG (Neutral Balance) right at the channel for the Servo Wires ;-)
I think that's very close to where it needs to be.
If I can ever get less than 5mph wind I'll be able to confirm that in Manual Mode.
This is the 2nd flight with an FPV System!

It's time to test out the FPV System!

The orange curve at the top and bottom right is a section of the canopy in view because I didn't get the camera positioned just right.
When to camera is positioned just right you do not see any obstructions.

Get one today from Banggood!

Here is a link to the Micro AIO FPV Camera:

Turbowing 5.8G 48CH 25mw 700TVL 1/4 CMOS Wide Angle FPV Camera Support OSD NTSC/PAL Switchable

Here is a link to the SBEC (Switching Voltage Regulator):

Pololu 3.3V, 300mA Step-Down Voltage Regulator D24V3F3

Here is a link to this Cool Micro Wing:

KINGKONG/LDARC TINY WING 450mm Wingspan EPP FPV PNP With Flight Control Reading
Posted by frank4wing | Aug 10, 2019 @ 05:59 AM | 949 Views
In my first Caddx Ratel night test video it was not visible how dark it actually was outside. Inspired by RCG user TinkleWid aka Silver Steve I added a Ratel to the Caddx Turtle on my Armattan Gecko because the FPV feed of the Turtle is just bad.

With both cameras on board you can directly compare the Ratel feed (the small screen) to the Turtle's HD record. The Turtle gives a good impression how dark it was to the eyes about half an hour after sunset while the Ratel made it bright and comfortable to fly.

Caddx Ratel vs Caddx Turtle Night Test (3 min 55 sec)

Posted by Tazkiller85 | Aug 10, 2019 @ 05:07 AM | 1,047 Views
Yep Les Amis,
Pour les enfants ... Ou pas ! lol . Je test aujourd'hui le petit SNAPTAIN H823H. Ce mini drone est, à la base, destiné aux plus jeunes, mais il m'a vraiment surpris par ses performances de vol et d'autonomie. Très bien protégé dans sa cage, il est très résistant aux chocs et inoffensif pour les enfants . Ses modes Headless et flip automatique raviront les plus petits qui pourront rapidement le prendre en main. En bref, un excellent petit appareil à emmener partout ... Bon Film à Tous .

Snaptain H823H - Review Test Démo - Concours LIPO BAG et Annonces ... (28 min 25 sec)

NOTATAZ : 18/20 Top pour les enfants ! Et pas que ... lol

Niveau : Débutants et Confirmés
Les + : Très stable, Bien protégé, Bonne autonomie, Résistant, Simple à prendre en main, 3 Batteries ...
Les - : Pas grand chose à lui reprocher .

Règles du Concours du 10/08 au 16/08 minuit :
- Liker la vidéo
- Commenté avec "LIPO" dans le message
- Une participation par personne
- Résultats du tirage au sort le 17/08/2019 (10 gagnants)
- Les gagnants seront remboursés de leur commande du LIPO BAG.

- Si Vous voulez aider la chaîne avec un don :

Les produits présentés sont visibles ici (en cliquant sur ces liens vous soutenez ma chaîne) Merci à vous :

- Enceinte Bluetooth Waterproof DIGOO : Reading
Posted by eddy2019 | Aug 10, 2019 @ 02:00 AM | 904 Views
Simply speaking, a device that requires an (electrical) source is called an active device, and a device that does not require an (electrical) source is a passive device. Active devices are typically used for signal amplification, conversion, etc., passive devices are used for signal transmission, or "signal amplification" by directionality. Capacitors, resistors, and inductors are passive devices, and ICs, modules, etc. are all active devices. (Commonly speaking, it is the active components, such as triodes, that require a power supply to display their characteristics. A passive component is called without a power supply.)

1. Basic definition of passive components
If an electronic component operates without any form of power supply inside it, the device is called a passive device.

From the nature of the circuit, passive components have two basic characteristics:

(1) It either consumes electrical energy or converts electrical energy into other forms of other energy.

(2) Just input the signal and it will work without external power supply.

2. Basic definition of active devices
If an electronic component has a power supply inside it, the device is called an active device.

From the perspective of circuit properties, active devices have two basic characteristics:

(1) It also consumes electricity itself.

(2) In addition to the input signal, there must be an external power supply to work properly.

It can be seen that the active device and...Continue Reading
Posted by AGFrc Nicole | Aug 09, 2019 @ 11:08 PM | 1,000 Views
AGFrc specially makes this outstanding waterproof low profile servo for entry starters with surprising price.
This full metal A50CHLW servo applies the contactless magnetic angle sensor technique,reaches to 18KG high torque,
can perform extremely well under water.
So this is ideal for 1/10 and 1/12 RC Models and other vehicles that require high torque and high level waterproof.
You will love this servo with ultra light 50g enthusiastic red body!

Another super torque low profile servo I would like to mention is A50BHL with 19KG, make your drift car like a monster is possible !

Soon you can buy on Amazon or , then your RC car on-road can be also enjoy underwater, experiencing a different joy !!!

Feel free to contact [email protected] for agent or Customized order ! Sample order accepted now

Posted by Bill M - RC | Aug 09, 2019 @ 07:19 PM | 1,460 Views
Hi fellow pilots & rc enthusiasts

Foxeer Micro Predator V4 FPV Camera review includes overview, osd settings, fitting & flight test of this Foxeer Micro Predator V4 1.8mm 4:3/16:9 1000TVL PAL/NTSC Switchable Super WDR FPV Camera for FPV Racing Drone.

You can get this Foxeer Micro Predator V4 FPV Camera in UK here:

Foxeer Micro Predator V4 FPV Camera review (12 min 15 sec)

Posted by Kmot | Aug 09, 2019 @ 04:13 PM | 1,132 Views
I did not know much about Merco engines, except that I recalled the brand name from being in the hobby all of my adult life. I did not even know that they were made in England. Until recently, that is.

I had been thinking of getting a Merco, mostly because it seemed to be a somewhat obscure brand of engine and I wanted one for my collection. How wrong I was! Thanks to the website Sceptre Flight, which has dozens of old engine reviews from the long gone print magazines, I learned just how much the Merco was revered back in the day, and what a world champion caliber competition engine it really was.

But before I had read any of those old articles, I had purchased from the RCG classifieds, a well used and castor oil coated Merco .61 Mark I. I intended to tear it down, and rebuild it.

This particular engine was frozen solid like a rock! The old, dried castor oil had welded every part to each other. It took copious amounts of heat to get anything to loosen up so that I could disassemble something as simple as the back plate. To get the cylinder out I had to machine a drift from bronze, and use a lead hammer while wearing thick leather gloves to protect my hands from the searing heat due to having to super heat the crankcase to loosen up the burnt on, dried out castor oil residue.

Once I had the engine completely disassembled, I soaked the parts in an ultrasonic cleaner with a diluted cleaner concentrate. That took care of most of the old castor oil but some of the parts
...Continue Reading
Posted by TMacFPV | Aug 09, 2019 @ 03:04 PM | 919 Views
Demonstration of how to enable GPS Rescue Mode Failsafe using our BetaFlight OSD AND we’ll do a test flight to demo the actual BetaFlight GPS Rescue 🚨 Failsafe option! Ready to see how this turns out?!?🤔

Posted by Libelle201B | Aug 09, 2019 @ 03:02 PM | 995 Views
About a month or so ago I came apon a slope video of the MiBo Micro Swift, I was very impressed, so impressed I bought one. Not cheap my any means but nothing that is molded glass is cheap. The kit quality is top notch, impeccable glass work with control surfaces already permanently hinged and sealed. The only disapointment was that the plane came with no building instructions or plans. Not sure if that was the senders fault or the manufacturers fault, anyways I proceeded on my own. I dont want to get into a detailed build story but I will say I made two modifications, one was to permanently mount the horizontal stab, not use the 3mm nylon mounting screw provided, and I used my own method to attach and remove the canopy using magnets, not the spring loaded pin provided. The radio gear is the Tactic 650 tx and rx is 625 Tactic. Elevator and rudder servo's are Dynam 7gram, aileron servos are Hitec HS 40, battery is 4 cell AAA. Today was the Swift's first test flights, very light and sporadic breeze at the Hill, ok for a few hand launches. The cg was at the recomended forward limit (35mm) back from the LE, elevator set at the recomended min (5mm up/down), aileron minimums (4mm down/8mm up), rudder (25mm L/R). Although there was practically no lift I was able to get in probably close to a dozen passes in I think about three-four separate launches. The only adjustment made was about four clicks of down on the elevator trim which made for a perfectly aligned stab/elevator, no up or down deflection on the elevator trailing edge, perfect! The Swift flies as if it is on rails, very stable and fast for such a small and light model. The control throws seem just right for me anyways, not twitchy at all but very controlable at the same time, and she goes exactly where you point her. With a nice breeze and some good lift she will be a rocket and highly aerobatic