Wazmo


I use the Endoplasma set up in my Avistar. You must replace the brushes every 10-12 flights at $6.00 a pair. GP3300 batteries are too heavey for this small Extra. They are great in my Avistar and Funtana.


I Flew the Extra today with the twin spd 400 setup. Not as good as brushless, but it flew. Slower climb slower forward speed. At 3 minutes in, power was lost and the plane glided in for its best landing ever. After action report revealed that the set screw from the right motor's pinion came out thus placing all of the work on the left motor. The offending pinion was replaced test trails continue tomarrow afternoon.

Nice to see someone else enjoys the Extra 300. I also converted the Modeltech 25 size to Electric and it's a real joy to fly. Though needs a lot of runway to land. Haven't been able to get it to slow down enough to land on our 100 ft. Glider runway consistantly.
Specifications

Motor - AXI 2820/12 swinging an APC 11/7E Prop
Castle Creations 45 Amp ESC
KoKam 3S-1P 2000 MAH High Capacity Li-Poly Batteries
Weighs in at 53 Oz. - 46 ounces of Static thrust
Draws 38 Amps Static at full throttle (Pack handles 30A Continuous and after in the air seldom go back to full throttle)
This give a Static 127 Watts per pound

[img]Extra300_25Size.jpg[/img]

alta


Very nice plane! I have tried the AXI282010 and a 10x6 in mine on a 3S1P Kokam 20C and a 4S1P. Motor got too hot! The DD Jeti 30-3 with a 10x6 has been the best set up for me. I am currently testing a Dymond Modelsport speed 400 twin geardrive in this plane. The second test flight was better than the first. I replaced one of the motors with a HL speed 400 Rocket motor. No overheating problems. I slid the battery all the way to the firewall but it is still tail heavy. When I reinstall the cowl, it should balance. I flew for 7 minutes on a 10 cell 1950 nimh pack and taxied back to the pits. This setup has made it a lighter slower plane. It was always so fast before.

Alta


I tried a 8 cell 1800 mah pack today. It barely flew. Very slow climb. Long takeoff roll. 106 watts 17 amps. Back to a 3S or 10 cells for me. I can't believe it flew at all. Still in one piece.

I tried a 3S 2100 mah 20C Kokam on Monday. 32 Amps/323 Watts. Good flying. I'm using a 30 Amp controller and it thermalled off at about 5 minutes. No damage. I have added some air vents and will go down to a 10x7 prop if needed. This has been the best brushed combo I have tried in this plane. Fogged in today. No test flights


I was only able to fly my HL Scorpio 3D 400 because I could fly close in.

Well,


I burned up the speed 400 twin drive. No damage to the SP control, gearbox or plane. Switched everything back to the JETI system.

I had to get a replacement for my Extra300. Warped. Hobby People were very good about it and will send me a new one.
The replacement wing I ordered was the wrong color of blue and warped as well so they let me pick out something else for the exchange. I asked for three Hitech servos. You really have to look over some of these arfs carefully when they arrive.
I too had to go down in prop size because of amp draw Steve. But your setup should run great without the larger diameter prop.

Sturtz

I went back to the JETI 30-3 DD system I was using before. This makes it a heavier faster plane. I will do more expiramenting with the twin drive later.

Sturtz


I have gotten away from ordering planes by mail because of this reason. I always want to see whats in the package first. If the price is really good like at a HL dump sale I will consider it. I get them through the LHS or GRAVES RC in O town.

Not a bad decision Steve. It's like a slot machine , or as Forrest Gump might say..... "Like a box of Chocolates. You never know what your gonna get." But I must give Kyle at Hobby People credit for taking care of me on this matter. Plus I didn't have to send a whole plane back and pay a bunch of shipping costs. And with some elbow grease I could have two of these birds in my hanger if I wanted now. But it would be a lot of work to fix the first plane so it would line up and fly straight. Oh well,,, it's winter.
By the way Steve,,,,, I was told by a veteran RC modeler and flyer that these birds are very twitchy flyers. It that so ?

Sturtz


Yes!! Make it a little nose heavy. When tail heavy it is very hard to control. Snaps too easy.

Got my new one today. This one looks straight.

Sturtz



Keep it light!!

Hi,
Excellent thread StephenT.
I'm new here. I recently converted the Modeltech Extra to electric also. I was really enjoying my GWS brushless Corsair but yearned for something larger that I could really learn precision flying on.
What a great airplane! Mine has the AXI 2820/10 with a Jeti 40 advance and a 9X6 prop. I only have about 15 flights so far and I have to get a meter but the guy who put her together for me said she's only drawing about 24 amps avg. Plenty of power for where I'm at at the moment. I'm using TP 3s/2100 and getting 8 to 10 minutes.
Altacom, I'm pretty sure that was your video I saw just after I ordered my plane and AXI and thought, now he's got the right idea.
This is a great plane for conversion. I've only flown foam up 'till now but from what I've read people that know says this is one perfect little airplane and I believe it. She really does retain energy coming in. Anyone tried another servo in the wing? This plane seems like a prime candidate for flaperons.
What have you guys flown before the Extra?

Man, this is a great flying airplane! With my 9X6 the motor comes down warm and the battery a little warmer but neither are hot.

RR


I have flown many planes. RC and full scale. I started with a foam Soarstar and my Funtana was my most complex so far. My Magic is my favorite. It is also my test bed.

[quote]ORIGINAL: StephenT

I tried a 3S 2100 mah 20C Kokam on Monday. 32 Amps/323 Watts. Good flying. I'm using a 30 Amp controller and it thermalled off at about 5 minutes.
You need a bigger speedcontroller, 45 ampper would be good , however you got watch your lipos also [X(]make sure there`s enough cooling running through the fuselage . Ed

Mav

I was running too many amps through my twin speed 400 drive system and this is why the speed control kept shutting down. Both motors finially burnt up and I went back to my Jeti motor. The speed control survived though.

Mav

I am going to try putting in 2 HL speed 400 Rocket motors in the twin drive later on because they can handle more amps.

Guys,



I got the Rocket speed 400's from Graves. I'm going to give that twin drive another try!

Wow. Awesome thread guys. Tons of great information. I see this thread is a few months old now, but I have a question for altacom. I have that exact axi and castle creation combo you have, and I was wondering how it was holding up for you. I picked up the Extra for my first nitro-to-electric conversion, and my set up would be pretty darn close to the set up you have listed. Any updates on how the extra is holding up would be greatly appreciated .

Again, awesome thread StephenT.

Guys

Well I have never gotten around to putting the twin drive back into the Extra yet. I re shaped a 4S3P lipo pack to fit the plane though and will test it tomarrow. It was a 4S4P pack but some of the cells puffed due to the higher draw of my Magic's power system. If things work out tomarrow, I may keep it as a 3P pack. It should be good to 36 Amps continuous draw and the Jeti is just under that DD. If it does not work out, Back to the twin drive and the Jeti goes in something else.

Well


I got my son a Kokam 3200 mah 3S lipo for his Banchee E3D but he has never built it. I put the 3S in the Extra and it flies good for 10 minutes. The 4S3P battery mentioned earlier was too heavy and made landings too fast. I sliced in another P and it is being used in my Magic! Now should I get a 4S 3200?

guys


I have switched the Extra back to a speed 400 twin drive brushed system. It is the same GB as I used before but with the HL Rocket 400 motors in it. These are heavier duty. Bench test show 300 watts at 30 Amps with a 3S pack. Flight Test Thursday AM. I put the Jeti 30-3 out so I can use it in my new H9 PC-9 conversion.

Guys




No Joy! It Would not get off the ground and burnt up a motor. Back to brushless. I have a 282010 laying around or maybe I'll shelve it for now.