Magic Extra 300L

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Model Tech

ModelTech Magic Extra 300L 46 ARF .46 - .53

Fakta

När jag byggde denna fick jag bakvikt p.g.a. för mycket epoxi till fena och stabilisator.

Magic Extra 300 L från modeltech Utrustad med ASP .61 för att få rätt balans. Avsedd för .46. ARF från [modeltech]. Drivs av en A.S.P. .61 motor.

R/C flygplan med fem Futaba 3001 servon. avsedd för .46 motor.

Data
tillverkare	ModelTech
namn	Magic Extra 300L 46 ARF
spännvidd	1257 mm
vingyta	45,16 dm²
vingkorda	355 mm
dithedral	0 º
längd	1300 mm
vikt	2300 gram
styrning	gas, höjd, sida och skevroder
sidoroder (3d)	± 41 mm (± 44 mm)
höjdroder (3d)	± 19 mm (± 41 mm)
skevroder (3d)	± 16 mm (± 25 mm)
motor	A.S.P. .61
Servo	5 st Futaba S3003
Mottagare
vingbelastning	51 gram/dm2

Modifieringar

Större motor på grund av bakvikt
större hjul på grund av ojämt fält
förstärkt kropp över vingen

Forum

Engelsk resension

Features include: aluminum landing gear mains; steerable tail wheel; clear canopy; complete hardware; pull-pull rudder; and detailed, photo illustrated instruction manual.

media:magic_extra_400.pdf

Magic Extra 300

Rapport från http://www.rcuniverse.com/magazine/article_display.cfm?article_id=240

. The Magic Extra 300 arrived in a typical white box measuring 5 1/2" x 18" x 43" with a label showing the product, and listing is Specs. Inside, all of the parts were individually sealed in plastic bags, with a simple cardboard divider separating the fuse, wings, and accessories compartments. As I began to unwrap the parts, I couldn't get over how LIGHT everything was! In all of the times I have SEEN 3-D models, this was actually the first time I had ever handled one in the pre-assembly stage. It was really quite impressive.

A good "going over" showed good construction, a very nice covering job, and most importantly, no shipping damage. All of the parts seem to be present and accounted for, so it was time to start reading the Manual.

Manual

The "Magic" came with a very complete, easy to understand Photo Illustrated Manual. The one thing I noticed was that it appears as though Modeltech is in the process of updating the model, yet there was no Addendum. I say this because the Manual listed several steps that had already been completed, such as drilling the Firewall and Landing Gear Mounts and installing blind nuts. This only proved to be a problem when it came to attaching the wing, but I'll discuss that problem when we get to it.

WING ASSEMBLY

The Wing assembly is a snap. The plywood Wing Joiner is epoxied into place, and the Wing Halves are joined, aligned, and taped until cured. Once the epoxy had cured, it was time to attach the Wing to the Fuse.

Slight Problem

The next step in the instructions is to align the Wing to the Fuse, and drill the mounting holes. As I said earlier, several steps listed in the instructions were already completed at the factory, but unfortunately, this step was only partially completed.

As I went to attach the Wing, I noticed that the Wing Hold-down Block was already drilled, and had Blind Nuts installed, yet the Wing was not drilled. It would have been virtually impossible to drill accurately sized holes in the wing, and have them in both the proper location, AND at the proper angle to line up with the nuts. I can only assume that the model I received was a "transitional" unit, meaning that Modeltech is in the process of updating the kit to pre-drilled holes (Which would be a nice feature), and that the model that I received was packaged with one of the older wings.

Whatever the case, I simply knocked out the Blind Nuts, plugged the holes, and proceeded to drill new ones as per the manual's instructions (I did, however, divert from the instructions by tapping the hold-down block and using 1/4-20 Nylon Bolts instead of the steel screws and Blind Nuts - simply because it was easier than cleaning the glue off of the old blind nuts).

Once the Wing is attached, a plywood Bolt Plate is attached to the Wing Mount Bolt area, then strips of covering are removed from the center section in preparation of attaching the Belly Pan. The Belly Pan is epoxied in place, and then it's on to the next step.

TAIL ASSEMBLY

Installing the tail feathers starts with attaching the Stab. The instructions clearly state that the alignment with the wing should be checked. On the model I have, the stab did not sit true with the wing, but with a few small shims added, it lined up nicely. Then, some covering is removed from the bottom of the Fin, and the Fin is positioned into its slot.

Before attaching the Control Surfaces, the Tail Wheel Bracket is installed with two screws. Once all of the glue had set, all of the control surfaces were installed using CA Hinges.

LANDING GEAR

The Main Gear was a snap. Contrary to what the Manual said, the holes were already drilled with pre-mounted blind nuts, so mounting was simply a matter of attaching the two screws. Next, the Wheel Pants were drilled and slotted, then the wheel, axle and pant are attached to the gear. The pants are not made from Fiberglass or ABS, but rather from a type of polyethylene plastic (Similar to what your fuel jug is made from, only thicker). This made for some pretty easy cutting with a hobby knife.

På grund av ojämt gräs tog jag sen av de snygga hjulkåporna och satte på stora hjul (75mm)

MOUNTING THE ENGINE

På grund av bakvikt satte jag på en tung A.S.P. .61. Den fick inte riktigt plats så jag sågade ut

RADIO INSTALLATION

Jag använde fem Futaba S3003 servo.

The three Servos that get mounted in the Fuselage are installed inside a hatch in the belly, right behind the wing. The Elevator Servo is first to be installed. I really didn't like the way the two push rods were linked together. Once bent to shape, they are simply joined with two wheel collars. I always try to use a manufacturers method before resorting to something else, but I would strongly suggest using something a little more secure. Wrapping them with copper wire and soldering them would be ideal, but even adding a little thread and CA along with the wheel collars would do (Although, I must admit that the provided system held up through many flights).

Next, the Rudder Servo is mounted in its place, forward and slightly above the Elevator Servo. Double Push Rods are then installed to create a Pull-Pull arrangement. I really like the servo layout. It seems to be well thought out, and it works.

Once the Servos are secured, the Control Horns are added, and the Clevises are attached.

Time to install the Aileron Servos! The covering is cut away from the mount openings, and the servos are installed in the usual manner. The only thing that made this step difficult was (and this is one of my pet peeves) that the strings to guide the extensions through to the center section were too short! I mean really, come on out there! They go through the trouble of putting the strings in there, why don't they at least give us another few inches? In this case, they were so short that I had to tape them to the Extensions because they were too short to tie!

Other than that, the Wing Servo Installation went off without a hitch. The Push Rods were pre-shaped, and they were all the proper length. Again, Control Horns and Clevises were added and connected.

Once the Throttle Servo and Push Rod are installed, the receiver and Battery Pack are secured in the wing opening, and the Belly Hatch, gets secured with two screws. Next, the Tank Hatch gets a screw to hold it in place. With the battery forward of the receiver, the plane balanced right inside of the recommended CG range. A small wingtip weight for lateral balance, and she was finished.

That's it! in less than 9 hours, the Modeltech Magic Extra 300 was ready to get dirty! Time to add a few Decals and take some pictures!

Maiden Flight

I don't usually use dual rates, but for the Magic, I made an exception. I was using a Futaba SkySport 6 channel radio, so I had some mixing ability, but I chose not to use it. While I was curious to see what could be done without using anything fancy, I was also pretty apprehensive about those huge control surfaces, so I set the low rates to a conservative 3/4" on both elevators and ailerons. High rates however, were set for MAX throw (I may be cautious, but I was expecting to have some fun too!).

We were in the midst of a typical Minnesota Autumn; the temperature was ok, but the winds had been blowing steadily for a few weeks straight. I'd seen this enough to know that while there would be no let up, at least the winds would be steady. So, with the engine broken in, and ready to go, it was only my nerves keeping me on the ground. It was time to stop thinking about it, and fire it up.

The Magnum 52 kicked right off. I can tell you right now, that I usually prefer 4-strokes, but as time went on, I really took a liking to this engine. It started easily every time, and once the low end had been leaned out, its transitioning was outstanding. And it is MORE than enough power for this airplane.

Now she's sitting on the runway. One final check of the controls and I gradually increased power. I had only pushed the throttle to half way, when the Magic lifted. It immediately seemed stable, so I added a bit more power and nosed her straight up.

WOW!

The power-to-weight ratio was incredible! I still wasn't at full throttle and it was screaming straight up as if gravity was a passing fad. The low rates were docile enough to allow me to fly it without any concern. It was quick and agile, but very predictable, and only minor trim corrections were needed.

After a few passes of the field, it was time to have some fun. I kicked in the high rates and... HOLY COW!!! It really caught me off guard at first, but I quickly regained my composure and (even more quickly) learned to use TINY control inputs.

Once the initial shock was over, I really started to have fun. Loops, and rolls were a completely new experience. Inside loops, outside loops, rolling verticals... this thing was going ballistic! And I was loving every minute of it! In a Knife-Edge, the Magic Extra had a tendency to tuck towards the belly, but it was no problem to hold it straight. If you are the type who prefers to dial this out on a computer radio, you'll have no problem doing so. KE Loops were also effortless, thanks to the awesome power of the Magnum XLS .52, although, the plane is so light, I'd place even money that a good BB .46 would work very well.

Ok, now it's time to try hovering.

I managed to do a respectable "stationary flight", although I really couldn't call it a hover. But in my defense, the wind wasn't helping any (You can hear it blowing in the video). The wind did however help for doing Harrier landings. My first one was pretty impressive even if I do say so myself (Well, I was impressed anyway). Note: The first set of videos, are clips taken of the actual maiden flight.

As I mentioned in the intro, my friend Josh (who is an accomplished 3-D Heli Pilot) was witnessing the whole thing, and he wanted a chance at the sticks. He managed considerably better than I did, but we both agreed that the winds were a bit too stiff. And, as it does so early here in Autumn, it was getting dark. So, we packed up and went home. We discussed it in my office the next day, and decided to try a few things. First, we both felt that it was a bit over powered. If you live in a high climate, this combo would be ideal, but we both felt it could use some more tail weight, and seeing as how we needed to weigh it down anyway, I added an ounce of lead to the tail. This moved the CG back to 4" from the LE.

Second Flight

The next time we got out to the field, the wind was much calmer. The added tail-weight helped, but we still had the problem of too much power to weight (i.e., when you were blowing enough air to allow the control surfaces to work, the plane was climbing), so we added another ounce of lead to the tail. This shifted the CG back to 4 1/2", and it seemed to be what was needed. Now even I could hover it! We spent the rest of the weekend really putting the Magic through its paces. This has really turned into one FUN airplane!

I think my favorite thing was the Harrier Landings. The Magic did them very well in calm winds, and with a slight head wind, it was actually comical how slowly it would settle in.

Modeltech Magic Extra 300 w/ Magnum XLS .52 Windows Media Player Format

My First Attempt At Hovering

3-D Sequence By Josh Moen

Above all, let me say that this airplane/engine combo is exciting! If you live in a high-altitude area, you won't have any problems getting it to hover. At my altitude - 1200 ft ASL - we were hovering at 1/3 throttle with an additional 2oz of lead.

I would also like to caution that this is by no means a good second plane, or even 3rd in most cases. However, the Magic Extra is a LOT of fun in the hands of a capable pilot. With the exception of the problem I had bolting the wing on (Which I would assume has been resolved by the time of this writing), the assembly is straight forward, and can be accomplished by anyone who has minimal experience.

If 3-D is what you're looking for, this is a great "Throw in the car and head out to the field" kind of plane that I think you will enjoy as much as I have!

Den här sidan är hämtad från http://agert.homelinux.org/blog/index.php/Magic_Extra_300L

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