JMP Firebird ***Will Ship***
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Seller:pilott28 Details:
$7,000.00
| 10/2/2008
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Thanks. Just started reading the Tom Pierce website, it's a gold mine of good information on finishing techniques for a paint rookie like me (read : I hate painting ). Let's pray I can drag myself back to the workshop after a succesful maiden flight, and get that part done too... !
Posts: 225
Joined: 1/13/2002 From: St. Charles,
MO, USA Status: offline
I too have a JL L-39 basically ready to fly. My problem is also the rudder slop. I am thinking of relocating servo higher in the fin then use a conventional pushrod/horn system. Have you any different ideas. Wayne
Posts: 279
Joined: 1/28/2002 From: Scottsdale, AZ, USA Status: offline
Hello WHMC,
I received my JL L-39 the other day and have been hard at work. I too found the tail set up less than perfact. However upon your suggestion of conventional placement of servo with horns and linkage to the rudder, if you candle the skin, (to see where the ribs are) you will see the servo needs to be almost in the middle of the tail, and at that point the thickness (cord) of the tail is not thick enough to fit a good quality servo. So back to JL set up. Here is what I did however.
1. I cut away a square of fiberglass material behind the provided circular cut a way. I found that where JL wanted you to set up the steel pin to fit into the track was in the middle of the length of the aluminum channel grove. By cutting away more fiberglass material allowed me to move the "pin" backward and thus having more leverage on the tail. I also found that the pin provided was garbage and I took a spare bolt with an aluminum JR horn and fastened my own stronger set up.
2. I also placed carbon fiber on all area's where servos are to be mounted, with the tail a must. The hatch also was not rigid, and got some stregthening with carbon fiber.
The glue is drying on the tail as I type, so I will follow up with the results.
Posts: 333
Joined: 6/9/2005 From: Cardiff, UNITED KINGDOM Status: offline
Zivo,WHMC & Kevin, What do you think about the quality of the kit. Is it good value for money. Also what turbine will you be using? All the best, John C p.s. Do you fly from tarmac or grass?
Posts: 279
Joined: 1/28/2002 From: Scottsdale, AZ, USA Status: offline
Hi John,
I just posted to your other blog, I guess I will post here to. But first I will answer your question about quality etc.
I read the other post on quality, and I bought the kit. I have bought 3 other Sky Master Kits so I have some experience to compare it too. Here is my opinion:
I think the engineering is great. Very well thought out and design is a winner. The parts fit almost perfect some need a little sanding but that is expected. Gear doors are double ply and give that thickness appeal that looks great. All gear doors fit very well in the pocket, and after figuring out the geometry of where the hinges go and how much flange needs to be trimmed away for proper movement, the doors work great. The hatch latch for the canopy seems a bit weak, and I will carbon fiber the back plate of the canopy for strength. Also as I learned from another kit, I will never attach a servo to the balsa under side of a wing or elevator. This kit has Flaps, elevator, and tail install directly on these balsa surfaces. So once again I got out the resin and Carbon fiber cloth and strengthened the undersides. I also CF the spine and front portion of where the air break mechanism goes. The Fuse seems rigid, but I am sure once I get the turbine, goodies and fuel in the bird, I think the fuse will need some carbon fiber stringers for that added strength. As noted, I build a jet to fly, not to crash. However the little extra weight added for the benefit, in my mind is well worth it.
So now onto the landing gear, well I am used to using beefy, strong, high quality gear which in my opinion is one of the most important aspects of jets. The stock gear as supplied by JL is IMOP the weakest gear possible that may be OK for this size jet. The struts and wheels look good. I decided to use these first instead of pimping this ride out before seeing if I will like the flight characteristics. If everything goes great and I think the gear sucks I'll than replace with some better. I'll know more in the next week.
I have redone the main RX board completely, for use with flat Lipo's, gyros and Weatronic 10-20R RX. For the JetCAT ECU and main batt for the Wea, I've installed DN-Power 4100 MAh / 20C / 2-cells. The Wea back-up batt is a DN-Power 1350 MAh / 20C / 2-cells.
All cables and wires are lead UNDER the main board, which is also removable with 4 bolts. The ECU and fuel system will be a separate board aft the main board.
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All Forums >> RC Airplanes >> RC Jets >> RE: What do you think about JETLEGEND L39? 
RE: What do you think about JETLEGEND L39? - 
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