Ease of Build
Great Looks and Great flying
step in manual to glue anti-rotation dowel
required to build:
EA-300SP is Extra?s single-seat version of the EA-300LP. The newest
model of the aerobatic series, the EA-300SP is for the serious aerobatic
and sport pilot. The aircraft features a lightweight oil cooling
system, a sport carbon-fiber instrument panel, a lightweight avionics
package and a Teflon hose kit with integrated fire sleeves. This
latest model has all the design and built-in safety features of
its predecessors, and has the unmatched JAA- and FAA-certification
load factor to plus/minus 10G?s. It?s a thrilling ride.
Planes introduces the Extra 300 SP in smaller form, which can
be flown with Electric or Glow power and includes an Expertly
covered airframe in Monokote covering, 2 piece wing and lightweight
built up structure.
General building tools, screwdrivers, ball drivers, etc.
Covering Iron or Heat gun
Thin and thick CA
Hole drilled for CA to wick in
Digital servos used
Pictured with the extra mounts on it
300 SP arrived well packed and didn't even have a wrinkle in the
covering, I went over it with a Hot Iron anyway but the Monokote was
all stuck down very well.
the ailerons was the first step in the manual. First a small hole was
drilled in the hinge slot to allow the thin CA to wick in better. The
Instruction say to install the wing anti rotation dowels next but they
never mention to glue them. I used 5 minute Epoxy to flue mine in,
don't forget to glue them!
servos used in the Extra were Futaba S9650 Digitals, they have a few
tabs that need to be cut off to fit into the servo mounts. After
gluing the Blocks of wood into the hatch with 5 minute epoxy, the
servo was screwed to them, I also like to use a thin layer of double
sided tape as well to make sure they won't loosen up.
And with them removed
Wood mounts glued in
Servo mounted in tray
Control Horns were screwed to the Aileron, then the screw was removed
and the hole was hardened with thin CA. The linkage is very simple and
only took a few minutes to make and then the Wings were done.
step in the manual says to align the Horizontal stab, then remove the
covering. Well this step has already been completed from the factory
so all I had to do was line it up with the center of the fuse which is
marked with a laser burnt line on the firewall, then glue it in place
with 30 minute Epoxy making sure it was level as well.
Covering was already removed
Laser etched centerline
In this picture the front is on the left
Wheel pant mounted with screws
assembly of the Landing gear was done by mounting the wheels to the
nicely painted Aluminum gear, then the wheel pants with the screws in
from the back and finally bolting them to the Fuse. I used a little
clear silicone on the wheel pant between them and the gear as well for
will either sweep backwards or forwards, I mounted mine with the
straight side of the gear forward.
rudder was hinged with the included CA hinges just like the Ailerons,
only the tailwheel needed to be glued in place at the same time with
Epoxy. The Elevators were then also hinged with CA hinges.
the long control rods for the Elevator in the tubes inside the fuse, then installed the
Control horns on them just like the Ailerons. The Elevator servo was mounted
in the wood tray and I cut one of the control rods shorter than the
other as per the instructions. After the servo was centered and the Elevator halves were lined
up, the 2 rods were clamped together with 2 wheel collars. I also used
some silver solder and a hot iron to solder them together so they
could not come loose.
manual states that when using a Glow Engine the Rudder servo is to be
mounted in the rear section of the fuse on the bottom, it goes on to
mention if a Lighter Engine is used to mount it in the tray where the
Elevator servo is mounted. I guessed that the .46AX I was using fell
into the lighter category so I mounted it in the servo tray next to
the Elevator Servo. The opening is sized for a Micro servo but there
are etched lines that when cut fit a standard servo perfectly.
Elevator control horn location
Laser etched to cut for a larger servo
Elevator linkage complete
Canopy mounting dowels
Magnet with small strip of ply to lock it in place
Fuel tank setup
assembly was done next. The front dowels were glued in place with
thick CA then the hatch was put on the fuse and the reinforcing
circles of balsa were tacked in place in the front of the firewall
with a little thick ca and accelerator so it wouldnt have time to wick
in and glue the dowels to the Firewwall, then after removing the canopy thin CA
was added to them.
uses a ingenious way to hold it in place, I thought my canopy was
defective as it seemed to short but it is supposed to be that way. The
small magnets were glued in the holes in the canopy and in the fuse
making sure to get the poles of them correct so they stick to each
other. The canopy then just slides under the front cowl, then
backwards and a strip of ply on the bottom of it locks it in place
while the magnets hold it back. The canopy can be opened in mere
OS .46AX Engine used
Firewall is fuelproofed
Great Planes center locator used to mount Engine
Throttle servo with bent puchrod to clear Exhaust
Bottom of Cowl needed trimmed to fit
There is a
wide range of Engines that can be used on the Extra, I was sent the OS
.46AX 2 stroke and mounting it couldn't have been easier. The firewall
was already fuelproofed along with the blind nuts for the mount
installed. It was a matter of mounting the Engine on the mount so the
back plate was 4 15/16" from the back of the firewall per the manual.
The Micro servo for the Throttle was mounted in its slot and the
linkage bent as seen in the picture so it would clear the muffler.
mounting the Engine I then moved on to the Cowl but I could not get it
on far enough so that the engine backplate would be out far enough so
the spinner would not rub on the Cowl.
have added a few washers to the Engine mount but it was already done
and Locktited in place. I decide to trim the bottom of the Cowl where
it was hitting the Landing gear a tiny bit as seen in the picture. I
recommend mounting your engine with the back plate 1/8" farther out
than the manual calls for.
Cowl mounting screw into Balsa
Piece of lite ply added
Cuts for the Muffler
Receiver pack, Futaba R617FS Fasst receiver, battery and fuel
The Cowl was mounted using the supplied screws but I found the top
screws just threaded into thin balsa, I added a tiny piece of ply so
they would have something to hold on to. The Cowl only had to be cut a
tiny bit on the bottom and then a Silicone extension was installed so
the Exhaust would exit the plane. The receiver battery was mounted as
seen in the picture.
I used a Futaba R617FS Fasst 2.4ghz receiver
and it was mounted right next to the Elevator servo as seen in the
The last thing to do was apply the included decals. This step usually
takes a while as you have to cut each one out of the large sheet
and trim as close as you can to it. Not with this Extra you don't!
They are already pre-cut and all that was required was to remove
them from the sheet and put them on the plane!
The Extra SP was now complete and ready to go to the Field!.
Balance on the Extra was checked and it fell right on the mark of
3 3/4" back from the leading edge.
Control throws were setup per the manual which are as follows.
Low rate 3/8"up and down
High rate 3/4" up and down
Low rate 3/8" up and down
High rate 3/4" up and down
low rate 2" left and right
Rudder high rate 2 3/4" right and left
the canopy was easily removed I used the 3rd line from the fuel
tank for a fill tube and left it loose in the fuse, with a plug
in the end of course. To refuel the Canopy just pops off and it
is sitting right there, no need for cutting holes for fuel dots
or complicated fillers.
.46 fired right up and I ran one tank of fuel thru it on the ground
to start the break in procedure. After that the Extra was ready
to fly and it was set on the runway for its maiden flight. The
throttle was slowly advanced on my Futaba 14MZ radio, and with
a little rudder to keep it straight, it had a short take
off roll and then was airborne.
few circuits were flown around the field and it was immediately
noticed that the low rate were not much at all and I felt more
comfortable flying it on high rates.
did land and adjust the rates to my liking which were as follows.
The High rates in the manual were used for normal flying and my
High rates were adjusted to get all the throw I could. Your preference
will be different but the rates in the book will get you in the
air and started safely.
also used -40% expo on all the flight surfaces.
Extra 300 SP will knife edge all day long and mine had no coupling,
just rock solid knife edge. Inverted only required a touch of
"down" Elevator to hold it level so the CG felt perfect.
.46 would hover the Extra but it wouldn't really pull out, if
you want more power I recommend the OS .70 4 stroke. The .46 makes
it a great lightweight sport flyer and it is very smooth in the
air and easy to fly.
Extra 300 SP does great Spins and knife edge spins, along with
Waterfalls if you get the timing just right.
handled the wind very well, as you can hear in the video it was
a pretty windy day and it is hardly noticeable in the flight.
The guys at the field I let fly it said it felt just like their
33% planes in the air.
Extra lands very easily and really slows down with no problems
of tip stalling or snapping. It has a great glide to it and deadstick
landings are also easy, well, as easy as a deadstick landings
Planes has created a great looking and flying Airplane with
the Extra 300 SP. It can be flown as an all around Sport Plane or
a 3D Aerobat depending on your flying style. With a wide range of
engines, 2 stroke to 4 stroke, and Electric as well, there will
be a power system for any type flyer.
2 piece wing makes transporting very easy and it can fit in the
smallest vehicles with ease. Although not for a beginner, the
Extra 300 SP would make a great third or possibly second Airplane.
Extra's ease of assembly will have you from the shop to the flying
field in no time!
The comments, observations and conclusions made in this review are solely with respect to the particular item the editor reviewed and may not apply generally to similar products by the manufacturer. We cannot be responsible for any manufacturer defects in workmanship or other deficiencies in products like the one featured in the review.