RE: Great Planes L-39

RE: Great Planes L-39
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RE: Great Planes L-39 - 6/21/2008 8:37:34 PM

Posts: 144
Joined: 2/29/2008
From: st. louis, MO, USA
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Thank guys for you input regarding servos. Interestingly enough, I had a near fatal with my souped up diablo yesterday. Because of servos no less, I was really high, altitude not drugs. I did a split s and dove for the deck, faster than ever before, when I pulled up on the stick, it SLOWLY pulled out of the dive. I attribute this to the force of the wind resistance on the control surface. I am using the stock servos in this plane. I would hate to lose anything L-39 or otherwise because of cheaping out on good parts I will look at the servos you reccommend. Also what type of glue do you all suggest? That may be a silly question but it's more foolish to disregard knowledge and experience of those around you, make sense?

(in reply to haasjj)

RE: Great Planes L-39 - 6/22/2008 4:45:02 AM

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

I used medium gap fill CA and a little bit of kicker to build mine. Others have used epoxy with no trouble. I used the CA because I don't know about you, but when I use epoxy I think a little is good, running out of the joints must be better LOL. With a 2200 3cell lipo and all the electronics including the bigger motor, mine weighs in at 20oz even RTF.

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RE: Great Planes L-39 - 6/25/2008 8:50:35 PM

pkoury

Posts: 40
Joined: 1/1/2003
From: Picayune, MS, USA
Status: offline

My L-39 with the Sparks canopy upgrade flies great, I did install a hotter motor and a paper thrust tube. I have noticed that the hinge on the elevator is starting to disappear. the right elevator has no hinge material from the tip inboard about 3/4 inch. Anyone else having this problem?

(in reply to gr8taz nitro)

RE: Great Planes L-39 - 6/26/2008 12:43:17 AM

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Joined: 11/23/2006
From: St Louis, MI, USA
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quote:

ORIGINAL: pkoury

My L-39 with the Sparks canopy upgrade flies great, I did install a hotter motor and a paper thrust tube. I have noticed that the hinge on the elevator is starting to disappear. the right elevator has no hinge material from the tip inboard about 3/4 inch. Anyone else having this problem?

Just get some du-bro hinges and go for it.....no big deal.

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RE: Great Planes L-39 - 6/28/2008 4:24:55 AM

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Joined: 6/1/2008
From: , MI, USA
Status: offline

I'm glad to hear that not ALL you geeks are getting plugged in the cornspitter with this rig like I did! See early posts. I bought mine in Portage MI @ Hobbysports.com and have taken it in 3 times to get help, but the thing just wont fly. Now I'm dealing with the company as the choads have no recommendations over here. I have to send it in FULLY assembled with all my gear ($385) with the jet. NICE! that should be cheap! Then wait to find out how I got ganked, and hopefully finally be able to fly when they ship it back with their suggestions. They (Electrify) think it's the ESC (brand new) or the motor. The only thing I can think is that some jacknut put the wrong pitch prop in my package. The motor really screams! That's the ONLY thing these veterans at the shop have suggested after seeing the setup. This is really all very sad IMHO. Again, I'm glad that not everyone is dealing with this...........

(in reply to crashcrash)

RE: Great Planes L-39 - 7/4/2008 1:06:10 AM

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Joined: 2/29/2008
From: st. louis, MO, USA
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Got mine together today and cant wait to fly it, bit Im a bit conserned about the CG, it's a bit forward because of this 2200 mah battery, Im using a dons wicked extreme 5400kv with a Xf fan setup so it's the battery that is suggested. Ive have used the set up in my diablo and just transfered it to the L-39. I think I'll be OK, some of you all use this kind of setup as well.

(in reply to FarginFarger)

RE: Great Planes L-39 - 7/4/2008 1:29:39 AM

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From: St Louis, MI, USA
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quote:

ORIGINAL: animal acker

Got mine together today and cant wait to fly it, bit Im a bit conserned about the CG, it's a bit forward because of this 2200 mah battery, Im using a dons wicked extreme 5400kv with a Xf fan setup so it's the battery that is suggested. Ive have used the set up in my diablo and just transfered it to the L-39. I think I'll be OK, some of you all use this kind of setup as well.

CG....a little nose heavy isn't a bad thing...a little tail heavy is a real bad thing, you should be OK.

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RE: Great Planes L-39 - 7/4/2008 3:21:37 PM

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Joined: 6/22/2003
From: Willoughby, OH, USA
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I fly mine nose heavy all the time, especially on 4S. In fact when going faster I prefer nose heavy as they track better. You just need to hold a little more up on landing that is all.

Don

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RE: Great Planes L-39 - 7/6/2008 3:51:20 AM

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Joined: 2/29/2008
From: st. louis, MO, USA
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Yes, I agree now, I have three flights and have noticed that this plane is more prone to stalling and is not for the beginner, Ive been relatively lucky, only a few small crashes, nothing a little electrical tape and some ca cant fix. But wow what a rocket! The first flight I made I thought, "wow, what have I been missing?" This plane is so wonderful especially when all I can compare it to is that pos, diablo! Which by the way I will be assembling stock and shooting down with the help of my friend and his 12 guage. I just need someone to record it for all to enjoy.

(in reply to dslusarc)

RE: Great Planes L-39 - 7/6/2008 3:39:29 PM

Posts: 72
Joined: 9/16/2006
From: Pewaukee, WI, ALBANIA
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Way to go AA! Didn't I tell you that the Diablo was a turd? I just gutted what was left of mine off the floor this morning and tossed it in the trash. Target practice sounds fun. Shoot some video too. BTW once you get the hang of this one you should try the Twister or my newest favorite jet the Sapac T-45 composit. Boy does that thing scoot!

(in reply to animal acker)

RE: Great Planes L-39 - 7/8/2008 3:38:34 AM

Posts: 144
Joined: 2/29/2008
From: st. louis, MO, USA
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Paul, your absolutely right. However, I have encountered some things which I would like to discuss with you all, when cruising along at higher rates of speed the plane seems to wiggle in the air, what's that all about? Also when I do a loop and pull back on the stick too hard when coming out of the loop it sometimes will spin out of control, and I must quickly regain stability. Now I know what your answers will be, if it wants to do that when you pull back that hard, just dont pull back like that, right? I just wondered if anyone else has encountered this, and has anyone had the peice of foam that is held on by magnets above the motor and edf fly off yet? Today as I was really picking up some good speed that thing just blasted off!
And those servo protectors under the wings are not very useful, they keep breaking off when I land.

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RE: Great Planes L-39 - 7/8/2008 4:09:02 AM

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Joined: 6/22/2003
From: Willoughby, OH, USA
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Reduce the up elevator throw as it sounds like your getting a high speed stall. I fly on duals rate on the elevator as I need more up for landing but it is way too much for 100 mph flying.

Don

(in reply to animal acker)

RE: Great Planes L-39 - 7/8/2008 6:12:16 PM

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

Right on, too much elevator and it goes into a spin where you run out of altitude and ideas in a hurry. As far as the servo arms busting off, I took a piece of 3/32 light ply and cut a strip that is just as wide as the protector and runs the length of the wing and then glued it to the bottom of the wing. As far as the wiggle that the plane does, that comes from not enough area on the fin. Not a big deal and don't go all Diablo on my by trying to make modifications on it because you'll end up adding weight and that's not a good thing.
Paul

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RE: Great Planes L-39 - 7/9/2008 2:34:43 AM

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

quote:

ORIGINAL: animal acker

Paul, your absolutely right. However, I have encountered some things which I would like to discuss with you all, when cruising along at higher rates of speed the plane seems to wiggle in the air, what's that all about? Also when I do a loop and pull back on the stick too hard when coming out of the loop it sometimes will spin out of control, and I must quickly regain stability. Now I know what your answers will be, if it wants to do that when you pull back that hard, just dont pull back like that, right? I just wondered if anyone else has encountered this, and has anyone had the peice of foam that is held on by magnets above the motor and edf fly off yet? Today as I was really picking up some good speed that thing just blasted off!
And those servo protectors under the wings are not very useful, they keep breaking off when I land.

Mine does the little tail shimmy also. I generally only see it when I'm cruising around at about 1/2 throttle. It does go away at higher speed. I blew the fan cover off mine on the second flight. I put some clear packing tape over the hatch to keep it in place. That way if I need to get back in there for any reason I can cut the tape and get the hatch off.

_____________________________

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

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RE: Great Planes L-39 - 7/9/2008 3:54:09 AM

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

So tonight I used my wing tanks as skids on the belly and glued them on, right next to the srvos in hopes that they will act as protection for these servo horns that stick out the bottom, and if that doesnt work I have thought about routing everything on the top of the wing, just put a small hole in the wing for the horn top fit through and flip the aileron hing upside down also, but I think it would require a longer horn, any thoughts on that? and does anyone know how fast this thing is going with a wicked extreme 54ookv on 3cell 2200mah 25C?

(in reply to gr8taz nitro)

RE: Great Planes L-39 - 7/9/2008 4:19:01 AM

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

I think I have said this a few times.

Solution: Purchase S3156 MG servos. Your servos will never break again and you will be able to land on the belly in normal configuration.

http://www3.towerhobbies.com/cgi-bin/wti0001p?&P=PR&I=FUTM0656

(in reply to animal acker)