Sport Planes (Formerly I/C & Gas Conversion) Discuss I/C or Gas Conversions, Aerobatic Planes and Sport Aircraft

Post your giant scale electric conversions!

Old 04-14-2015, 10:01 PM
  #1  
Xpress..
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Default Post your giant scale electric conversions!

Lets keep this thread about giant scales only? Lets say, 75"/30cc or bigger only, electric conversions!

Here's mine:

88" Extreme Flight Yak 54
Hacker A60-18L motor
Hacker Master Spin 99 OPTO ESC
Xoar 24x12 PJN prop
Zippy 6S 5000 30C packs (12s2p configuration)
Hitec HS7954SH servos all around
Hitec Optima 9 receiver

All guided by my Hitec Aurora 9X transmitter.

Lets see yours!
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Old 04-15-2015, 07:51 PM
  #2  
Porcia83
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Sweet! Looking forward to seeing some others. Saw some pretty big planes last year at the NEAT fair in NY, some that were conversions.
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Old 04-15-2015, 08:02 PM
  #3  
fhhuber
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Sideways counts... the EDF powered "Falcon 120" just barely meets "big Bird" dimensions.

Nitroplanes Falcon 120 (intended for 120 glow)
BVM "EVF" on 12S 5000 mah (EVF/EDF unit includes the Castle ESC, 22 lb static peak by fish scale tied to the tail) Peak 105 amps measured before the wattmeter melted down.
My own design for the nacelle
Hitec servos
SpringAir retracts
Titanium struts and MPI aluminum hub wheels from Central Hobbies
2X 2200 mah LiFe 2S for RX system power
DX-18, AR12100 + telemetry (Airspeed, Main battery voltage, RX voltage, RX data, Main Batt temp... haven't got the RPM connection done yet)

Max speed level flight 119 mph. (its an overweight pig to fly)
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Old 04-15-2015, 08:02 PM
  #4  
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My biggest was my 27% Pitts M12. Ran a Hacker motor on 12S. swinging a 20 inch prop.

Didn't like the charge times or cost of batteries compared to gas so sold that one off. I have more though...
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Old 04-15-2015, 08:18 PM
  #5  
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A few others I've done over the years. While the Shoestrings are not giant scale by your definition the are by IMAA standards as they are 1/4 scale planes.

My First conversion was the Great Planes Shoestring and later after three version of it not going as fast as I wanted (and staying intact) I had a couple of spectacular crashes with them I went to the new Seagull models Shoestring and it has help up much better.

Then there is the 1/4 Scale Piper PA-12. And finally a 1/5 scale Waco YMF-12.

All flying on a minimum of 8s.
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Old 04-15-2015, 09:54 PM
  #6  
kyleservicetech
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Default Giant Scale Models

Originally Posted by Xpress.. View Post
Lets keep this thread about giant scales only? Lets say, 75"/30cc or bigger only, electric conversions!
Here you go!

Giant Scale Big Stick Conversion
http://www.wattflyer.com/forums/showthread.php?t=65052

Just put five flights on that Big Stick yesterday. Still running the same overweight, oversized, undervoltage 12S2P A123's in that Big Stick model. And, they still turn the same 19X12 APC-E prop with the same Hacker A60-16M motor at the same RPM after over 450 flights on the pack. This is five years flying with that same 12S2P A123 battery pack. That same power system had been used in an earlier giant scale model. Currrent pulled is 78 Amps at full power. With a different prop, that system got me the 3 KW award!

Redwing MXSR Model
http://www.wattflyer.com/forums/showthread.php?t=72225
This model was flown all last year, and I'm waiting for decent weather around here to put it back in the air.

The power systems used in these two giant scale models are able to pull the model straight up out of sight, in a very un-scale like flying mode.
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Old 04-19-2015, 03:23 AM
  #7  
flying-barely
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Built in the winter of 13/14', my 132" Turbo Beaver has had 13 flights to date. I had to transport it 45 miles one way to a bigger flying field all summer.
It electric, powered by a Suppo 7035-9 (190kv) motor, 110HV Castle Esc, turning a 20/10/ 3blade Mezjnik CF prop for 4600watts max on 12S/5000/40C Zippy's. XQ Power servos thru out, 277oz on elevator and rudder, 210oz on ailerons and flaps.
All up weight is 29 1/2 lbs. barely-flying
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Old 04-20-2015, 05:28 PM
  #8  
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Excellent. Keep them coming gents.

My big Yak just piled in on Saturday Still don't know why.
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Old 04-20-2015, 06:05 PM
  #9  
NJSwede
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There are differing opinions on whether 1/4-scale counts as giant scale, but I'm about to start converting my 3DHS 72" Extra from 36cc gas to a 12s LiPo system. It should be pretty epic.
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Old 05-07-2015, 09:08 PM
  #10  
crash_out
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My first and only giant scale conversion to date...

Hangar 9 27% Extra 260 78"
Eflite Power 160
Castle 110HV ESC
APC 20x10
Spektrum Powersafe RX
Dual LiFe 1800mah radio packs
10s 5000mah flight pack

It originally peaked at 2800 watts. I'm going to test some other props and try to get to 3kw
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Old 05-07-2015, 10:33 PM
  #11  
fhhuber
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Originally Posted by NJSwede View Post
There are differing opinions on whether 1/4-scale counts as giant scale, but I'm about to start converting my 3DHS 72" Extra from 36cc gas to a 12s LiPo system. It should be pretty epic.

Official IMAA/IMAC rules state: minimum 80" wingspan, 60" wingspan for biplanes, 140" combined width and length for jets, or true 1/4 scale.
IMAA originated the term "Giant Scale" (back when engines bigger than .61 ci were rarely seen on model aircraft)

There are many aircraft that meet the 1/4 scale without meeting the measurements.

***********

I have a 84 inch ancient PT-19 originally powered by ??? At one time had a ST-3000 , then a series of gasoline conversions (I bought it used with a Homelite conversion on the nose, they included all the junk engines they still had)... getting a E-Flite Power 180 installed. on it.
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Old 05-12-2015, 06:25 PM
  #12  
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Originally Posted by fhhuber View Post
Official IMAA/IMAC rules state: minimum 80" wingspan, 60" wingspan for biplanes, 140" combined width and length for jets, or true 1/4 scale.
IMAA originated the term "Giant Scale" (back when engines bigger than .61 ci were rarely seen on model aircraft)

There are many aircraft that meet the 1/4 scale without meeting the measurements.

***********

I have a 84 inch ancient PT-19 originally powered by ??? At one time had a ST-3000 , then a series of gasoline conversions (I bought it used with a Homelite conversion on the nose, they included all the junk engines they still had)... getting a E-Flite Power 180 installed. on it.
Yep, with a 19ft wingspan for the full scale version the Shoestring fits that bill for the 1/4 scale.
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Old 07-06-2015, 11:48 PM
  #13  
ckankel
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I've got a couple. The Hangar 9 Inverza 62 and Aeroworks Checkmate 50CC. They're both are equipped the same.

Eflite Power 360 motor
Castle Edge 160HV
Xoar PJN 24x10
Hitec HS-7954SH servos
12s power with Gens Ace and Glacier 5300mah 6s packs but I'm planning on trying Nano-Tech 8000mah
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Old 09-24-2015, 03:34 PM
  #14  
flypaper 2
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Here are a couple of mine. The Yellow Aircraft Cap 10 B . Also the Christen Eagle.
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Old 09-24-2015, 08:08 PM
  #15  
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Old Cessna something from a 40 gas to a beer-can sized Outtie, Fly's so Sweet! Bubsteve
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Old 09-25-2015, 02:30 PM
  #16  
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Nice Steve!
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Old 01-14-2016, 12:59 AM
  #17  
Ron
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does this count? 111" span :-)
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Old 01-14-2016, 01:19 AM
  #18  
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I should think so yes!
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Old 01-14-2016, 02:03 AM
  #19  
kyleservicetech
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Default Peak Models 50 cc Edge

This is a 90 inch wingspan model. Power is a Rimfire 50 cc electric motor, 22X12 prop, Castle Creations 120 Amp HV ESC, and will be using a battery pack consisting of 39 2500 Mah A123 cells. Really thought long and hard about using LiPos in this model. But, with all the concerns of which LiPo mfg is any good, storage issues, fire issues and so on, I'm going to add a pound and a half of weight and go with A123's.

Projected total weight will be 325 ounces. Power input estimated to be around 4400 Watts. That's over 200 Watts per pound, so it might get off the ground OK.

I've all ready tested the motor with some very old A123 battery packs. At 31 Volts DC and 90 Amps, it turned a 22X8 prop at 6500 RPM.

What concerns me is Peak models provides a Carbon Fiber wing tube with a 24.0 mm inside diameter, and a wall thickness of 30/1000. That is half the thickness of my giant Escapade's wing tube.

Comments on that wing tube anyone?
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Old 01-14-2016, 02:05 AM
  #20  
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Red face

Accidental Duplication, deleted
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Old 01-14-2016, 07:00 PM
  #21  
Ron
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Here.s a couple more 1/4 size Sopwith Tri-plane....G 110 Turnigy motor, 6 cells 4000 mah 20X10 prop. 21 pounds

84 " albatross...2 speed 480 brushed motors on 4 to 1 gear boxes, 3 cells
11X7 props 78 ounces

1/4 scale Tigermoth...Turnigy G160 290 kv motor 6 4000 mah cells, 22X12 prop. 22 1/2 pounds.
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Old 01-14-2016, 07:07 PM
  #22  
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Nice, Love the TM.
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Old 01-15-2016, 12:30 AM
  #23  
Ron
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Thanks...that is my 4th Tigermoth....The fifth one is getting closer to completion... they keep getting bigger
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Old 01-15-2016, 01:18 AM
  #24  
kyleservicetech
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Originally Posted by Ron View Post
Thanks...that is my 4th Tigermoth....The fifth one is getting closer to completion... they keep getting bigger

Was flying electrics waaaay before it was cool
Ah yes

I started flying electrics back in 1981, using some motors I rewound from work. It was a good day when the geared motor got the sailplane up to around 300 feet before it burned up. The motor in the attached photo was good for about 12 Amps and 15 Volts DC. The sliding switch on top of the motor applied power either through a power resistor to open the folding prop, or applied full power. That geared motor was tossed out when I moved to our new home. What a mistake, lost memories of how it used to be.

Now, posting #19 in this thread shows my giant scale model with a motor that will pull 120 Amps at 37 Volts DC. How times have changed.
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Old 01-15-2016, 05:47 PM
  #25  
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ahh yes...we were flying large models quite a few years back, but it seems that back then they didn't need 100 watts to the pound to fly :-)

seems to me that if you had 60, you had a very spritely model....now unless you have 100 or so, everyone says it won't fly :-)
did the watts get smaller while I wasn't looking?
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