RE: Great Planes L-39

RE: Great Planes L-39
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RE: Great Planes L-39 - 6/8/2008 2:17:21 AM

gr8taz nitro

Posts: 109
Joined: 6/18/2003
From: Joplin, MO, USA
Status: offline

The hinge on my left aileron broke while I was putting the plane together. I fixed mine with some Bob Smith flexible CA and haven't had any problems. If they break again, I'll probably cut them off and put in some robart pin hinges. I've got the hobby lobby f-18 and it came with pin hinges installed. I do need to come up with a better cover for the servo's though. I've stripped two gear sets in the wings now from belly landing in grass. I tried the stock ones and they shredded to pieces on the first flight.

As fast as mine is, I think I'm gonna end up taking a page out of russian's book and bite the bullet and buy some 4cells and upgrade the motor one more time. I'm lookin for more of a reaction at the field than, "hmmm that's a fast piece of foam." lol

_____________________________

If bullets bounced off supermans chest, why did he always duck when they threw the gun at him?

(in reply to crashcrash)

Post #: 76

RE: Great Planes L-39 - 6/10/2008 2:53:58 AM

The_Russian

Posts: 52
Joined: 3/30/2008
From: Ft. Lauderdale, FL, USA
Status: offline

What's up Electrifly???

I busted your tip tanks off during high-G turns today.......twice! It made a popping noise and separated like a set of real drop tanks! I thought those things would never come off in flight? The plane dutch rolls a bit more without them, especially at the speeds this L39 flies at.

There are two issues with my setup:

1. The battery does not provide enough amperage to maximize the potential of the motor and ESC. An (A) 1800, 2000, or 2200 mAh 4S LiPo will be required! I am pulling max amps out of the current battery, which leads to the next issue:

2. That **** is hot! It got so hot in the electrical compartment that it melted the heat shrink covering off of the ESC. I widened my NACA scoop in the nose but it had very little cooling effect.

Right now, the aircraft is pulling 400mAh per minute. The aircraft can only be flown for 2-3 minutes before breaking the 80% rule.

Need solutions............

The plane is still awesome and very fast. I was outrunning my friends Venus with an OS .55 at less than 50% power while he was at full!

(in reply to gr8taz nitro)

Post #: 77

RE: Great Planes L-39 - 6/10/2008 3:49:08 AM

crashcrash

Posts: 3741
Joined: 11/23/2006
From: St Louis, MI, USA
Status: offline

quote:

ORIGINAL: The_Russian

What's up Electrifly???

I busted your tip tanks off during high-G turns today.......twice! It made a popping noise and separated like a set of real drop tanks! I thought those things would never come off in flight? The plane dutch rolls a bit more without them, especially at the speeds this L39 flies at.

There are two issues with my setup:

1. The battery does not provide enough amperage to maximize the potential of the motor and ESC. An (A) 1800, 2000, or 2200 mAh 4S LiPo will be required! I am pulling max amps out of the current battery, which leads to the next issue:

2. That **** is hot! It got so hot in the electrical compartment that it melted the heat shrink covering off of the ESC. I widened my NACA scoop in the nose but it had very little cooling effect.

Right now, the aircraft is pulling 400mAh per minute. The aircraft can only be flown for 2-3 minutes before breaking the 80% rule.

Need solutions............

The plane is still awesome and very fast. I was outrunning my friends Venus with an OS .55 at less than 50% power while he was at full!

OK.....now you're scaring me...I haven't bought one yet.

_____________________________

what?

(in reply to The_Russian)

Post #: 78

RE: Great Planes L-39 - 6/10/2008 1:27:25 PM

boneviator

Posts: 3
Joined: 3/10/2007
From: Hartbeespoort, SOUTH AFRICA
Status: offline

Flown twice, replaced gearset twice..... next move light glass & CA or glider servo covers, busy building a 4S 1500 for the weekend, go fast or go splat....

(in reply to crashcrash)

Post #: 79

RE: Great Planes L-39 - 6/11/2008 2:36:10 AM

gr8taz nitro

Posts: 109
Joined: 6/18/2003
From: Joplin, MO, USA
Status: offline

quote:

ORIGINAL: The_Russian

What's up Electrifly???

I busted your tip tanks off during high-G turns today.......twice! It made a popping noise and separated like a set of real drop tanks! I thought those things would never come off in flight? The plane dutch rolls a bit more without them, especially at the speeds this L39 flies at.

There are two issues with my setup:

1. The battery does not provide enough amperage to maximize the potential of the motor and ESC. An (A) 1800, 2000, or 2200 mAh 4S LiPo will be required! I am pulling max amps out of the current battery, which leads to the next issue:

2. That **** is hot! It got so hot in the electrical compartment that it melted the heat shrink covering off of the ESC. I widened my NACA scoop in the nose but it had very little cooling effect.

Right now, the aircraft is pulling 400mAh per minute. The aircraft can only be flown for 2-3 minutes before breaking the 80% rule.

Need solutions............

The plane is still awesome and very fast. I was outrunning my friends Venus with an OS .55 at less than 50% power while he was at full!

Did you make any vent holes for the air to exit out of the cockpit area? If you didn't, the air just gets trapped and the heat will build up drastically. I made a couple of holes using some brass tube to drill through the back of the compartment to just in front of the intake. Since I can't make the exit holes 3 times bigger then the intake I'm using the fan unit to help pull the air out of the cockpit and keep the battery cool.
ESC is probably gonna have to be moved either in front of the fan unit or behind it depending on where you ended up mounting your fan. I can fly back to back packs and my esc is cold. I've got mine mounted behind my fan unit in the duct. Yeah I might lose a little speed and performance, but me equipment doesn't get hot.

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_____________________________

If bullets bounced off supermans chest, why did he always duck when they threw the gun at him?

(in reply to The_Russian)

Post #: 80

RE: Great Planes L-39 - 6/11/2008 10:29:47 PM

The_Russian

Posts: 52
Joined: 3/30/2008
From: Ft. Lauderdale, FL, USA
Status: offline

Yeah, I did. Actually, I used the same mod that Sparkie-RCU used on his canopy thread. I think it may be too late for me to relocated the esc to the tailpipe.

(in reply to gr8taz nitro)

Post #: 81

RE: Great Planes L-39 - 6/13/2008 5:58:27 PM

haasjj

Posts: 697
Joined: 4/29/2006
From: Dickinson, ND, USA
Status: offline

Well I finally got my L-39 built, wow what a nice looking plane. I read a few posts about stripping gears in the wing, don't the foam covers protect the servo enough?

How much wind can this plane handle?, its been windy as heck here in western ND lately and I want to start off on a calm day but after that I don't know what it could handle.

(in reply to The_Russian)

Post #: 82

RE: Great Planes L-39 - 6/13/2008 7:07:21 PM

The_Russian

Posts: 52
Joined: 3/30/2008
From: Ft. Lauderdale, FL, USA
Status: offline

The servo covers come off every once-in-a-while and need to be glued back on afterwards. Have some CA ready to go at the field with you.

A better choice for aileron servos are the Futaba S3156 digital metal gear servos. They are invincible and fit in the same hole as the 3114. If you strip one, go get some of those. Don't rebuild the 3114!

Wind will be up to you. I have flown in 20 knot winds in Florida with gusts and had no problem. Just watch the downwind flights because she might get away from you or stall in the turn to upwind.

Good Luck.

(in reply to haasjj)

Post #: 83

RE: Great Planes L-39 - 6/13/2008 8:06:02 PM

paul daniel

Posts: 72
Joined: 9/16/2006
From: Pewaukee, WI, ALBANIA
Status: offline

Hey guys: I just had my L-38 up and it was sort of glitchy. The only thing I've done non-stock is put a 1500 mah battery in it. Because of that, I had to put the receiver up front ahead of the battery and esc. This reciever, a Hitech Electron 6 has not been a problem in the other plane I had which I also flew at the same location. The antenae wire does go past the battery and esc. Is that an issue? Any ideas will help.
Paul

(in reply to The_Russian)

Post #: 84

RE: Great Planes L-39 - 6/13/2008 8:53:35 PM

crashcrash

Posts: 3741
Joined: 11/23/2006
From: St Louis, MI, USA
Status: offline

quote:

ORIGINAL: paul daniel

Hey guys: I just had my L-38 up and it was sort of glitchy. The only thing I've done non-stock is put a 1500 mah battery in it. Because of that, I had to put the receiver up front ahead of the battery and esc. This reciever, a Hitech Electron 6 has not been a problem in the other plane I had which I also flew at the same location. The antenae wire does go past the battery and esc. Is that an issue? Any ideas will help.
Paul

Paul,
I'm running 2 electron 6's, one in an MX-400 helicopter and the other in an EP Glider, the TX is an Eclipse 7. I can tell you that routing the antenna anywhere near the ESC, servo wires, or any other electronics will result in glitching. For some reason, the electron 6's are very sensitive. I also discovered (almost crashing/helicopter) that if you get within 10ft of a power line....you totally loose signal. The Eclipse 7 and the electron 6 work great in planes if the antenna is routed properly and distance of the model isn't a factor unless powerlines are in proximity. You now now what I know.

_____________________________

what?

(in reply to paul daniel)

Post #: 85

RE: Great Planes L-39 - 6/13/2008 9:47:34 PM

paul daniel

Posts: 72
Joined: 9/16/2006
From: Pewaukee, WI, ALBANIA
Status: offline

That's what I thought it might be. I just looked at the cockpit area and I think I can move the ESC away from the receiver. It is a noisy little jet though. It makes more noise than my Twister. It actually hurts my ears when I run it up and I did the break in with the fan unit and motor.

(in reply to crashcrash)

Post #: 86

RE: Great Planes L-39 - 6/14/2008 12:06:27 AM

animal acker

Posts: 144
Joined: 2/29/2008
From: st. louis, MO, USA
Status: offline

So tell me paul, what do think of this plane? is it better than say, oh I dont know... maybe the Diablo!?

Please tell me what the differences are besides the diablo sucks the most of all planes and this one may not.

(in reply to paul daniel)

Post #: 87

RE: Great Planes L-39 - 6/14/2008 3:03:23 AM

paul daniel

Posts: 72
Joined: 9/16/2006
From: Pewaukee, WI, ALBANIA
Status: offline

Good to see you on this forum. Well, the first thing that separates this from the Diablo is that it actually flys! It's also lots faster and for a kit goes together pretty quick. Chuck the Diablo if you still have it and get one of these. I still do like the Twister which is rock solid in flight. The L-39 is a bit twichy but it was the first flight. I also have a Sapac T-45 waiting to fly and hoping the grass here in Wisconsin dries out soon and a E-flight F-15 to build. Nothing could be worse than the Diablo. Actually which died a couple of weeks ago. I was flying around and tried to do a split S. At the bottom of the manuvuer, the wings folded. Dead fred! It's laying on the floor of my basment waiting for me to gut the parts out of it. There will be no funeral.
Paul

(in reply to animal acker)

Post #: 88