The advantages to a V-tail are for the most part more structural than aerodynamic. The whetted area is essentially the same, but they have less interference drag than a conventional tail (fewer corners, and usually wider angles in those corners).
In addition, dividing up the same total area into only two surfaces instead of three means that their span loading and/or Reynolds numbers will be better. This becomes increasingly significant the smaller you get, so it can be a very important factor for models. This is part of the reason why V-tails are more common on models than on full-scale aircraft. They also have some of the same aerodynamic benefits as T-tails, but without the T-tails' deep stall problems and horrendous structural penalties.
OTOH, there is some destructive interference between the panels of a V-tail for yaw stabilization and rudder authority, which is a disadvantage in full-scale. However, in my experience, the effects of the improved span loading and Reynolds numbers usually more than make up for this in most model aircraft applications.
Structurally, a V-tail keeps most of the structural weight low, close to the axis of the tail boom, like a conventional tail. This keeps the torsional loads on the tailboom small during groundloops and other landing mishaps (the...Continue Reading
Ultracote and Monokote color paint match charts for mixing PPG paint.
Quick jump to your color below:
Ultracote: Orange, Yellow, Flame Red, Deep Blue, Black, White, Deep Red, True Red, Midnight Blue, Aluminum, Purple, Cub Yellow, Sky Blue
Monokote: Jet White, Royal Blue, Insignia Blue, Dark Red, Metallic Red, Red (miscle), Black, Sky Blue, Cub Yellow, Aluminum, Maroon, True Red, Metallic Blue, Purple
Note: Below the folloing links is the chart in text form, which is quick loading. You may also click the links to view the original JPG files of the scanned data, which has more information but takes a long time to load (up to 1MB!).
JPG #1 Ultracote Orange, Yellow, Flame Red, Deep Blue
JPG #2 Ultracote Black, White, Deep Red, True Red
JPG #3 Ultracote Midnight Blue, Aluminum, Purple, Cub Yellow
JPG #4 Ultracote Sky Blue
JPG #4 Monokote Jet White, Royal Blue,
JPG #5 Monokote Insignia Blue, Dark Red, Metallic Red, Red (miscle)
JPG #6 Monokote Black, Sky Blue, Cub Yellow, Aluminum
JPG #7 Monokote Maroon, True Red, Metallic Blue, Purple
Ultracote Orange Base Color Parts Cumulative
DMC900 Strong White 48.9 48.9
DMC908 Strong Yellow Oxide 23.0 71.9
DMC907 Yellow Shade Moly Orange 610.9 682.8
DMC906 Medium Chrome Yellow 757.9 1440.7
Ultracote Yellow Base Color Parts Cumulative
DMC900 Strong White 153.2 153.2
DMC905 Lemon Chrome Yellow 1240.8 1394....Continue Reading
Posted by bigtruck169 |
Mar 03, 2014 @ 01:42 PM | 1,339 Views
On an earlier thread I posted some links for covering weights, they were compiled by independent testers (listed below) using a variety of measuring standards like Oz/sq/yard, Gr/Sq/Meter, etc, making it hard to compare them accurately. Well, I sent'em all through the online converter and changed them all to "Grams per Square Foot". Why? Because it's easy. Most kits and plans (in the U.S.) supply wing area in square inches and we all know that 1 square foot= 144 square inches, right?
Anyway, here they are, lightest to heaviest from the top. Some of the sites differed by a small amount so I converted those to a "Range" and for a couple of samples there already was a "range" of weights, since some of the colors are heavier than others. For further descriptions see the links on the earlier post. http://www.wattflyer.com/forums/showthread.php?t=10278
Weights in Grams per square Foot.
Produce Bags (Thin Plastic, From Target) 0.53 (See Post # 18, 24)
Japanese Tissue 0.650
Risteen Microlite (Corsair Blue) 0.81 (See Post # 20)
Risteen Microlite 0.90-0.95 (see post # 15 + 20)
Esaki Light Silk (Clear) 0.97
Risteen Microlite (Light Yellow) 1.1 (See Post # 20)
Saran Wrap (11" x 12") 1.29 (See Post # 18)
Ripstop Polyester 1.575 (see post # 15)
Coverite MicroLite (Transparent) 1.889
Nelson LiteFilm 1.950
Airspan 2.119 (Mfg listed weights 2.229-2.601)
MicaFilm (Transparent) 2.332
Light Colored Japanese Tissue, 2....Continue Reading
DX7 - PZ Radian Pro Full House Set up
here is the setup for a Radian Pro with a DX7 and AR600, motor is on gear switch, flaps are on the throttle stick and camber is on 3-position flap switch.
First, you want the servos attached to the receiver as follows:
CH1 THRO - Flaps Y-harness
CH2 AILE - Right aileron
CH3 ELEV - Elevator
CH4 RUDD - Rudder
CH5 GEAR - ESC
CH6 AUX1 - Left aileron
Now, for the transmitter, in the system setup mode under TYPE SELECT, set the type to ACRO. Under INPUT SELECT, set AUX2 to INH and set FLAP to SYSTEM. Set FLAP TRIM to ACT. Under WING TYPE set FLAPERON to ON and V-TAIL to OFF.
In the function mode under REVERSING SW, set CH1 to NORM and the rest to REV.
Under FLAP SYS, under the FLAP column set NORM UP 20%, MID 0%, LAND DN 20%. These values can be adjusted for more or less camber. Leave the ELEV column set to all 0's.
Set PROG MIX1 to THRO-> ELEV ON and set both RATEs to -20%, SW to ON, and OFFSET to +100.
Set PROG MIX5 to FLAP-> THRO ON and set both RATEs to +100%, SW to ON, and OFFSET to 0.
Remember, with this setup, your throttle stick will normally be in the high position. I also moved my flap pushrods all the way to the end of the servo horns to get about double the throw.
Interfacing Spektrum DX7 to either DragonLink, EzUHF, Thomas Sherrer, or ChainLink LRS
March 17, 2011 Categories: Compatible Equipment Lists, Equipment Connections & Wiring, Featured by Ian Davidson 27 Comments
Connecting a Spektrum DX7 to long range radios is not documented well as most of the LRS manufacturers only explain how to connect their TX to Futaba radios. The DX7 has a trainer port that sends out PPM signals and some have tried to use this port for their LRS connection. The benefit of using the trainer port is that the DX7′s 2.4 radio is automatically cut from power and does not transmit any longer.
However, measuring the PPM’s signal power of the trainer port reveals that the signal is a lot weaker compared to the internal PPM bus signal. In theory, you want to provide your LRS system with the strongest PPM signal available, which means you have to use the internal PPM bus. This manual describes how to hook your LRS system directly into the PPM stream of the radio and also provides power (which the trainer port does not). While it requires you to open up the radio, cut some wires, make some solders, and drill a hole in the case, it’s really not that bad of a mod and provides a great solution that makes switching between LRS and 2.4 easy. Thanks to Ian for coming up with this solution and for writing it up!
This isn’t a detailed ‘how too’ manual, just a quick overview....Continue Reading
Just another sad heli guy pass away. Be safe. Dont know if law enforcement will do anything to stop us.
Queens man, 19, killed by toy helicopter shared passion for remote-controlled fliers with father
Roman Pirozek Jr. was in Dreier-Offerman Park — also known as Calvert Vaux Park — in Gravesend, Brooklyn when his remote-controlled helicopted sliced his head and throat Thursday.
Posted by bigtruck169 |
Feb 07, 2013 @ 01:59 PM | 2,434 Views
If you want a cheap quad to thrash around I think you might be going in the wrong direction. You can build a 400mm Hquad frame for about 4 bucks in 1/2" wood dowels and 1/8 birch ply. Run some 8 dollar Emax 2822s with cheap gemfan 8x4.5 props. This would allow you to use a 2200mah 3s for 8-9 minutes of tooling around. SimonK F30A escs and a Flip multiwii FC or a KKv2 if you want onboard programming without a bluetooth module.
The Hquad frames are hella tough and very rigid and dirt cheap.
light stryker -
5.8ghz 200mw micro stuff with bluebeam set, vrx on a 4 foot dowel/pole.
Stryker light, auw rtf with fpv gear and battery = exactly 400grams (14oz), thrust = over 17oz (500grams) (or more depending on prop but I like the 7x6 on the blue wonder 1700kv motor, speed range is 5-75mph dopplered)
vizio 15inch off 2200 3s = over 5 hours (removable black elmers foam board (velcro))
vtx and vrx powered off 1s ~150mah lipo each (about 30+ minutes possible, but I switch between 2 sets of batteries each flight)
3s 850mah flight pack (10-15 minute flight time cruising around, over 30 min possible by gliding around higher up)
pz0420-2.8mm lens with pan servo (case is dollartree foam board, paper removed, covered with uline packing tape (same for the elevons and verticals))
rp8d1 w/futaba 9capAnother FPV guide: http://videoaerialsystems.com/fpv-a-guide-to-success/
Posted by bigtruck169 |
Nov 21, 2012 @ 12:59 PM | 2,569 Views
During the past storm sandy in north east, we were out of electricity for almost 2 weeks. But we have natural gas supply (we can still cook). House was cold as hell.
So I try to figure out how to power up the heating furnace without 120v, at least heat up the house.
We are using steam heat (gas boil the water and steam just push up the pipe to upstairs). From what I saw, there is no hot water circulation pump or any circuit board, only wires to thermostat and the electric gas switch- solenoid. There is a small transformer (slightly bigger than regular cell phone charger) on ceiling. I believe this is the power supply for the whole heating furnace. I measure the output and it read 24volt AC
Now my question is how I get 24 volt AC, maybe using some old deep cycle battery that we use for charging in our flying field or worst just pull out my car battery just for emergency.
Some people told me to get a generator to main panel so I won’t have to rewire so much and at least house can have some light or so. But running a generator in suburban area is almost close to impossible. I will use it as last option.
Hope some electricians / plumber flyers here can give me some advice. Don’t know if we will be lucky to get power within 2 weeks. Thanks in advance. Mike
Posted by bigtruck169 |
Jun 04, 2012 @ 10:29 AM | 3,690 Views
Go "full screen" and turn-up the volume! The photography is HD, the planes are gorgeous, and, most notably, it is shot as the B17 takes off from Falcon Field in Mesa, AZ and then flies over the Superstition Mountains.
To the East of Apache Junction, then to Roosevelt & Canyon lakes, on the east edge of the Phoenix valley. The backdrops are stunning. Music is from the mini series John Adams.
Stryker 6x4 prop...I have also used the APC 6x4 e prop..The Stryker prop puts out more thrust though.I learned this early on..We used to build a lot of the F22 profile jets and powered them with the Stryker setup..I found out that the jets had quite a bit more vertical thrust with the stryker prop over the APC..
*** warbirds in bold ***
Jun 05, 2003 --> AeroBird 3
ParkZone Fall 2005 brochure
May 05, 2005 --> P-51D Mustang
Summer/Fall 2005 --> Typhoon 3D Brushless
Summer/Fall 2005 --> F-27B Stryker
Summer/Fall 2005 --> J-3 Cub
Summer/Fall 2005 --> Slo V
Summer/Fall 2005 --...Continue Reading
hinges - use the plastic strapping salvaged from packaging...I cut the strips into about 1" lengths and poke a few holes in each end so glue can penetrate all the way through, though the waffle texture is probably plenty of grip.Gorilla Glue (the white variety dries faster)
Ultra micro prop saver
1. spray can (wd40 tube) prop saver for ultra micro planes, no glue needed
2. is a small piece of plastic like from a broken toy or something, and I cut it into t round shape, then sand it down until it will barely fit...then press it in. I then drill a small hole in it with a pin-vice drill. I have no...Continue Reading
Boeing unveiled its hydrogen-powered Phantom Eye unmanned airborne system during a ceremony in St. Louis on July 12. The aircraft, which will stay aloft at 65,000 feet for up to four days, is powered by two, 2-liter, four-cylinder engines that provide 150 horsepower each. It has a 150-foot wingspan, will cruise at approximately 150 knots and can carry up to a 450-pound payload.
The two engines are Ford truck engines which have been modified to run on hyrodgen gas. The only emmission from hydrogen engines is water. The research and development for such engines has been conducted at the Savannah River Site at Aiken, SC.