Daily Archives: February 18, 2011

8 posts

P-39 Aircobra is Found Intact

Old Site Posts

Of all the warplanes in WWII, Stalin wanted this one the most because the 37 mm cannon, also the crankshaft of the engine, fired through the prop hub and could knock out a Panzer tank.  The engine was mounted behind the pilot and the driveshaft ran between the pilot’s feet. The plane was incredibly stable and easy to fly and pilot visibility great since there was no engine in the way of the pilot’s line of sight vision.  So, in place of the front engine, machine guns were mounted in addition to the one’s mounted on the wings.  

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Jacks Micro Mambo – Part 2

Builds & Reviews Old Site Posts

These planes were first trimmed out for a nice straight, flat glide. The wing is set at a positive angle so lift increases noticeably with speed. Adjustments were made with shims under the leading or trailing edge of the wing. You want a sink-rate optimum for a smooth dead-stick landing (as they all were).

Then it was time for the first powered flight. Just a little fuel, prop on backwards, and a smooth hand launch. Right thrust and down thrust (sometimes this was pretty radical) was used to achieve straight flight with a gentle climb. Nice, big sweeping turns would hold altitude. Once you’re three mistakes high, command full rudder. The plane will go into a steep, spiral dive. Release the rudder and all the extra lift results in a loop. Now you turn out of the loop at the bottom to bleed off the speed. If you apply rudder at about thirty degrees into the beginning of the loop, you get a rudder roll. If you wait until you get to the top of the loop and apply rudder, you do an Immelmann turn.

The Micro Mambo uses the Parkzone Ember 2 radio and pushrods. The motor/gearbox and prop is from a ParkZone Micro P-51.  It’s built mostly of 1/32″ contest balsa. Covered with AeroLite film trimmed with Monocote. The Cox .010 cylinder and carb were used for necessary nose weight. This turned out to be a little too heavy so I’m making a dummy cylinder from 1/64″ ply disks.

 

Scale: 44%
Wingspan: 16”
Length: 11 1/4”
Weight: 1.52 oz. / 43.1 g
Wing area: 46 sq. in.. .32 sq. ft.
Wing loading: 4.75 oz/sq. ft.
Radio: Ember 2 (AR6400)
Motor: ParkZone P-51 8.5 mm geared motor
Prop:130mm x 70mm  (P-51 prop cut to 115 mm)
Thrust: 29 g / 1.02 oz.

 

Mambo Eng. Cylinder

 

Wooden Cylinder Compared

 

Jack's Lathe

 

The Begining

 

The Frame

Peanut FJ-1 Fury

Builds & Reviews Old Site Posts

Impeller hub is made from the hub of a plastic Plantraco tri-turbo fan  prop. Impeller blades made from the thin, wooden insert in the cigar tube, CA’d with 3/4 oz. fiberglass cloth. Wrapped on a cylinder and cut at angles like making twisted blades of a prop for rubber powered stick models. What do ya’ll think?

 

Peanut FJ-1 Fury

The Next Big Thing-Step 2

Builds & Reviews Old Site Posts

It turns out that a laser printer uses a type of ink that is more like hot melt glue than ink. That’s why it is called toner instead of ink. There we go, learning something new everyday.This toner has a certain amount of acid resistance and can be used as a “mask” to etch a printed circuit board. To make it even easier, some very talented and generous people have already done the design and artwork and have posted it up in R/C Groups.

 

 

Multi Wii Adapter

So now I have the art work and access to a laser printer, I bought a blank circuitboard at radio shack,now what?
Check this site out.

http://www.spambutcher.com/art7/900117/

That’s what I did and this what I got:

 

 

Whoo Hoo! I’m SO excited ( I live a very dull life it seems…) Any little imperfection can be touched up with a Sharpie felt pen too. Now I have to etch the excess copper off. This is actually the easy part, but wear gloves and safety glasses because you are going to use swimming pool acid and drugstore hydrogen peroxide 50/50 mixed. Yep, just regular old hydrogen peroxide from the medicine cabinet. I “borrowed a cup” of acid from my neighbor who has a pool and I raided my medicine cabinet. I added the hydrogen peroxide to the acid slowly and it got all warm.  I place the circuit board in and swished it around until the copper was etched away just enough. I removed the board ans washed it off and Wah-Lah !  I’m SO excited!

 

 

Now I just cut the boards out and drill the holes.
Nothing to it, but to do it, right?

 

 

I am ready to “populate” the board. ( thats’ geek speek for solder on the parts)

I am SO excited! I log onto R/C Groups to post pictures and share. Well, some other enterprising people are just now, offering these same boards for sale!

http://www.multiwiicopter.com/

So, just buy the board and I’ll see you in the next installment of “The Next Big Thing”.

Until then, check out the below site for LOTS more entertainment.

http://www.rcgroups.com/forums/showthread.php?t=1332876

Rocket (Bob) Kreutzer

Precision Aerobatics

EMAC Pilots & Planes Old Site Posts

The neat thing about getting into this is that any aircraft that is straight and set up correctly will allow you to practice these things anytime you want, adding little things to your repertoire until you are able to do a number of really nice looking figures.  The basic figures that comprise the beginner level are really simply horizontal lines, vertical lines, 45 degree lines, simple axial rolls, and then spins and stall turns to provide a bit of spice. 
When you have soloed and you have moved up to more challenging aircraft…perhaps a low wing tail dragger.  Take offs and landings are in the bag so to speak and you are looking for new things to try then pilots frequently are caught rolling and looping and keeping good control of the aircraft all of the time and they begin to watch what others are doing with their aircraft.  Often times you will be impressed by someone who seems to be disciplined and is trying new things.  You want to go there too but you do not know  how to get on that road.
The road begins with watching the action at the field and picking out certain aircraft that you like the look of and can afford…both time and moneywise and talk to those that are flying these aircraft.  Many new aerobatic planes exist on the market and asking questions about them is a terrific idea.  One club member that comes to my mind is Craig Hunter who approached me repeatedly when I was flying a Fliton Extra 330 and plied me with questions about this and that and took pictures and asked how I liked the plane.  This went on for quite a while and I was wondering if it would come together and sure enough I know that he is successfully using that very good airplane to practice precision aerobatics. 
Once an aircraft has your fancy and you think it will fly straight then the next thing you must do is put it together correctly with the best servos and dependable power system that you can afford and begin to fly it and watch what it is doing when you try to fly straight lines of all types.  Here’s the thing:  light weight means a light wing loading…..a very good thing…., you must then get the center of gravity correct, you must get the thrust lines correct, and you must get the control throws correct.   When these are achieved you will be amazed at how much pleasure you will get from flying that aircraft.  Small airplanes are at a disadvantage because they tend to jump around a bit and seem to flit around instead of groove through aerobatic maneuvers.  The larger the aircraft the more solid it feels through turbulence because of the higher Reynolds Numbers.  RN is the laminar flow principles that air produces as it flows through or around an object.
Google it if you would like to find out more about RN.

This installment, as you noticed,  is all about the important questions…..do you want to fly smoothly and do you have the right tool for the job?   Once you get past these two in the affirmative then the next stage in development is to try to trim the aircraft to fly straight and level without touching the sticks….(once in level flight).  There is so much to learn in setting up a good aircraft but when you do have one set up and you like the feel of it in flight then you are ready to try loops that have constant radius throughout and slow rolls that require small inputs on rudder and elevator to hold the heading and roll rate constant.  Think about flying the nose of the aircraft and making your rudder and elevator guide the nose at all times by pressurizing those two surfaces.  There is nothing more excellent and exciting then to see a brilliantly performed slow roll from one end of the field to the other.  Once you learn to do them then rolling loops and circles are just around the corner.

Tim

 

Mini-Ultra Stick Pylon Racing

Old Site Posts

By Frank Gagliardi

Rescheduled for Saturday March 5th, 10:00 AM

The next race is scheduled for Saturday March 5th @1000 at the SEFSD field.

Everyone is asking……..we will fly two rounds. That is four 5 lap heats and two 10 lap finals. That will take care of January and February seeing as how 5 of us braved the wind on January 16th and had fun anyway…..steve, you have got to stop getting in my way, I’m running out of a/c!  It sure was fun! The trend seems to be to put the scorpion motor inside as John Forester first did. It balances better.

MU Banner

So………….get ready to rumble!

More Information:  pylonairracing.com & SEFSD

Contest, BBQ & Altitude Demonstration

Old Site Posts

2    BBQ LUNCH FREE TO ALL MEMBERS, FAMILY MEMBERS

  • STARTING AFTER TOUCH AND GO  …..11:15 AM OR SO
  • HEBREW NATIONAL HOT DOGS / GOURMET BUNS
  • POTATO SALAD  ALA COSTCO
  • CRUNCHY CHIPS ETC.
  • LEMONADE, SOFT DRINKS
  • DESSERTS…DO NOT MISS THIS!

3    TELEMETRY EQUIPMENT DEMONSTRATION FROM HITEC

  • PEDRO’S AIRPLANE WILL HAVE REAL TIME TELEMETRY
  • FLIGHT DEMONSTRATION WILL SHOW VARIOUS LOCATIONS AT OUR FLYING SITE AT 400 FEET FOR REFERENCE SAKE
  • THIS DEMONSTRATION WILL PROVIDE HELP TO THOSE THAT STILL DO NOT HAVE A GOOD SENSE OF 400 FEET ALTITUDE

4    BE SURE TO SHOW UP A LITTLE EARLY TO PRACTICE AND GET YOUR EQUIPMENT AND NERVES IN ORDER AND WORK UP AN APPETITE.  JUST A FUN EVENT TO START THE YEAR!

Questions:  Email Tim at:  trattaway@cox.net

BOARD OF DIRECTORS  SEFSD,    2/25/2011

 

Tornado