My love/hate relationship with a Mini Telemaster...
This one has quite the history. It's the first plane I assembled from kit.
In October 2005, I bought and built my Mini Telemaster. I built it
as shown in the plans (as best I could, anyway), and equipped it with 2
GWS NaroMAX++BB servos (as blinged out as the cheapies come anyway), a
geared speed 400 motor from an Ultrafly plane I had just crashed beyond
repair, a 2000mAh 3s Lipo, and a Cirrus receiver/speed control combo.
AUW is 23 ounces.
Excited as heck about building my first kit, I headed to a subdivision
that was under construction only a few blocks away from home. It was
the perfect spot--lots of newly paved streets and no buildings had been
started.
Flight 1: It took off well enough, but it seemed to turn to the
right much better than it would turn to the left. Luckily enough, I
landed it in one piece despite overshooting the landing (I
underestimated just how much of a floater the MT really is) and
bouncing off the pavement, over the curb, and rolling to a stop in some
pretty rough gravel. I checked the rudder to see if there were any
problems, saw none, and set up for another takeoff.
Flight 2: Great takeoff again. It climbed nicely, but wouldn't
turn at all to the left this time. After two gentle circles overhead,
the circling became tighter and the plane began to lose altitude while
still circling. Eventually, it rolled over and started to dive. It hit
the only structure within 500 yards--a port-a-potty. On impact, the
battery punched its way through the firewall and started on fire (away
from the plane and anything else flammable, thank goodness). The wing
had a sizeable dent on the leading edge from the impact also.
When I got home, I repaired the damage to the front end and replaced
some stripped servo gears, but left the wing alone. The MT sat
collecting dust for 6 months until I finally had the itch to build
again. The wing only took an hour to fix; the repairs consisted of
fabricating the front half of 2 wing ribs, splicing and sanding 8" of
the leading edge, and recovering the affected area.
Flight 3: This one took place in the spring on 40 acres of
the middle school's grass. I took off (ROG'd on the grass okay) and,
with only 3 feet of altitude, tried a left turn. Nothing. I immediately
cut power and let it glide back to earth.
I took it home and shelved it for another month. I was eventually
inspired by some threads here on rcgroups to build a wing with
ailerons. It was a little too light on the wings for my taste, so I
decided to shorten the wingspan up a little. So, for my first exercise
in scratch building, I put together a 36" wing with ailerons, using the
same airfoil as the plans. I didn't build any dihedral into the new
wing. The ailerons are 1" from front to back, run the full width of the
wing, and I can get almost 1" of deflection from them (and that's what
the radio's high rate is programmed to )
The only equipment changes to date have been the addition of another
GWS Naro servo for the ailerons, and a 1500mAh lipo to replace the one
that burned.
Flight 3: AUW is now 24 ounces, and the wing area is about 84%
of what it used to be. The higher wing loading made the takeoff run
slightly longer, but with only slight elevator input, the rise off
ground was almost as smooth and beautiful as watching a full-size
aircraft takeoff. It didn't have enough power to do clean-looking
loops, but over all, it was a refreshing and relaxing experience when
compared to all the frustration the plane had cause up to this point.
Despite the higher wing loading (about 14oz/sq.ft., compared to about 9
or 10 with the original wing) it still had a good glide to it with
power off, and landings were easy and uneventful. Flights 4, 5, and 6
were just as enjoyable as #3.
Flight 7: Started off as normal, but ended tragically. After
flying for about 5 minutes, I came in for a low pass. Five feet off the
ground and flying level, it suddenly rolled inverted and nosed into the
pavement. I had less than a second to react, and I didn't react... Near
as I could tell the motor mount came loose, and the motor pointed in
some weird direction and pulled the plane into the ground. Everything
in front of the solid wood landing gear block was crushed.
I rebuilt the front end that weekend.
Flight 8: Kind of gusty outside, but I flew anyway. The plane is
still light enough to get tossed around by the wind. I got tired of
fighting the wind real quick and decided to land early. Coming in for a
landing and less then a foot off the ground, a gust of wind from behind
gives the plane a hard 3-point landing. I checked the plane out, and
couldn't find any obvious damage.
Flight 9: After takeoff and a little cruisng, I tried a loop.
Coming down out of the loop, half of the horizontal stabilizer folded,
and the elevator from that half of the stab fell off and fluttered to
the ground. The covering was holding the stab to the plane, and it's
flapping made the plane uncontrollable. It nosed in pretty hard, but
without much real damage to the plane. The gearbox was toast; it had a
few cracks in the plastic, the spur cracked in half, and the ball
bearings exploded. My rebuilt nose snapped cleanly off.
So I rebuilt the nose again, and for simplicity of building, switched
from the stickmounted geared speed400 to a facemounted brushless
outrunner (Potensky 150W outrunner I got on clearance from
Hobby-Lobby). Not wanting to risk losing a lipo battery (or risk
starting a fire) I used a 12V NiMH battery. I also took the elevator
and rudder servos out of the middle of the fuselage, and I put 2 GWS
Pico's right near the tail. That was a bad idea--balancing the plane
required an ounce of lead on the firewall. AUW is 29oz!
Flight 10: The MT is a year old, and I took it to the same spot
it first flew and crashed. I throttled up, and it rolled and rolled and
rolled and rolled and rolled... after what was probably a 250' takeoff
run, it barely started to lift off the ground. I said 'heck with it',
cut throttle and let it settle back in. At least I could bring it home
in one piece this time.
I sold the motor, and the MT again sat for months. Just this past
weekend, I screwed up a 3d plane real bad. It was a foamie, and it
ended its time as just another trash can full of foam fragments. The
motor I had in it is a BL2215/25, rated at 175-watts. I only spent $25
on it brand new from some Chinese eBay dealer, and it's really a lot of
power for the money. After salvaging the motor and the other
electronics from the just crashed plane, an evil grin materialized on
my face as I held the motor in one hand and peered up at the shelved
MT. I mounted the motor, hooked up the Phoenix 25 esc, and confirmed
that the motor was spinning in the right direction when throttle was
applied.
With all of my belly landing planes, I've been breaking a lot of props
while it's been cold (they really get brittle and break when they
wouldn't in warmer temps). So the only prop I had that would give me
enough ground clearance was a Master Airscrew 9x6 that I've had for
years.
I decided to go with a 1800mAh lipo that I was willing to risk in a
crash. The motor didn't mean much to me either, for what little $$ it
cost. I also put in a Hitec 04MG receiver, with a supposedly 1 mile
range. Balancing the plane required the same ounce of lead on the
firewall--but AUW is now down to 25.5 ounces.
Flight 11: Yesterday. It was a calm, overcast day, and it
was unseasonably warm at 50F. So I left work a half hour early, and
loaded up the family and headed off to another subdivision under
construction. Same as the first flight, lots of newly paved streets and
no buildings. I hooked up the battery, secured the hatch, set the plane
in the middle of the roadway, and took a minute or two to calm my
nerves while I checked the control surfaces. With my nerves ready, I
gave it enough throttle to start rolling, then gave it full throttle.
It was off like a bullet, jumping off the ground in 20 ft into a 60
degree climb, and still accelerating like mad. It was probably 200 feet
off the ground and doing 45-50mph by the time I decided to do anything
with the contols. Loops were amazingly large, and I could even knife
edge a little. I coasted around to lose some altitude and brought it in
for a touch and go to see what to expect from the landing this time. It
still glides as well as it ever did, and I overshot my intended
touchdown point by at least 50 feet. I took it back up to around 200',
and flipped the controls into high rates. I tried a roll with full
aileron deflection, and it was quick, reeeeeeeaaalll quick. So I
decided to see how many rolls I could get in before the nose dropped
and it started losing altitude. Full left deflection and 1, 2, 3, 4 and
then I could hear a strange noise coming from the plane, kind of like a
flag flapping intensely in high winds. The plane would roll slowly to
the left if I left the controls alone. I brought it in for an
uneventful landing and went to inspect. The covering on the underside
of the right wing had ripped!! Not sure exactly what had caused it.
Maybe I cut into it with the razor I used to cut the white covering at
the wing spar. Just wish my wife had her camera with us at the time to take some video. Next time...
I've since upgraded to HS-55's on the tail and an HS-81 on the
ailerons. The rebuilt Telemaster was flown again last weekend. Two
1800mAh batteries lasted a little over half an hour. The cheapo 2215/25
EMax outrunner was a little noisier this time, but at least it's still
working after the last death spiral straight into the asphalt.
The Mini Telemaster is SOLD!! Off to ghostmechanic @ RCG.