Yann

Guys,

Put two more flights on the L39 today.
The afternoon was windy, but the plane was rock solid.
I had two 9 minutes fights. At the end of the first one, both tanks were dry empty.
I guess when I killed the turbine, the pump was draining the pipes out.
Great plane, great engine.

Yann

David Gladwin

Yann, you're absolutely right. I put on another 6 flights on mine yesterday in perfect conditions, flat calm, clear skies, 22 degrees and the model flew absolutely beautifully. At the end of the day, due to sun position, I was flying the model at 45 degrees to our nornal flight line and I could see that during the last flight EVERYONE in the pits was watching this little model do its stuff, it seems to have a magnetic effect on people. Wren performance, as usual, superb !

Regards,

David Gladwin.

Yann

How do you guys end up flying so much in a day !!! Do you have your private field ?
Where I fly, it is very crowded during the weed end...
How many flights do you get on one charge of the pump batt ?
The most I did was three.

L Turner

My Feedback: (3)

Hi Jack,

Working on my own little MW44 project , with two 12 oz shampoo bottles in the wing roots. What exact tank fittings are you using with your plax bottles? Are they like the Festo fittings shown in Swissflyer's photo?

Flying Electrons (Milwaukee)

Jack28

My Feedback: (19)

Hi L.Turner, I am using tank fittings from B&B Specialties, They are listed on the web site as tank fittings and come with three fittings and a nice felt clunk . You will need two packs, they are around $8.00 US. They are not like the 90 Degree Festos that Swissflyer is using , I could not find the Festo type. I have been told they work well, Jack.

paulputman

got my northstar L39 today from savex. very nice ..

surprised how light it is.

Paul

jess24845030

Hello all just recieved my savex l39 today looks really cool this is also going to be my first turbine i have got all my jr radio gear and am looking through these pages to help me put it together can some one tell me why every one seems to be making fuel takks from plax bottles and any advise on building will be greatly recieved this is the first time using this site i hope all goes well thanks

jess

Budgy545

Jess

I know it is a very daunting task but I would suggest you read through the whole thread if you haven't done so already. You will find all you need, and some, on these pages.

Plax bottles are one option, Netto shampoo bottles are another, graupner tank is another. I have used the 2 latter ones in my L39's and both work fine. The Netto bottles and Plax bottles are very similar iin configuration and I would choose one of these as they allow one tank to completely empty before the second tank starts to empty.

Good luck and happy building.

Ian

rcguy!

My Feedback: (69)

Just rec'd this reply from Carl Maroney at AMA on this subject. Clears this up pretty good. "DON'T SHOOT THE MESSENGER!"

FYI...MY nose wheel brake "on command" on my Reaction 44. Activated by a Hitec 32oz servo. Works VERY well.

"The AMA Safety Committee has reviewed the matter was unanimous on their determination that rule #6 indicates that a means must exist which allows the pilot to "command" the model to stop rather than simply allowing it to coast until it runs out of forward energy, either by distance or some form of drag inherent in the wheel. That clearly implies that some form of brakes are required which can be activated by the pilot during taxi and landing. The term "on command" appears to be the relevant point. The other points, including the type of brake construction, distance of roll, etc would not seem to be relevant."

Carl P. Maroney
Special Services Director
[email protected]
765.287.1256 X250
AMA HQ
5161 E Memorial Dr
Muncie, IN 47302
Website: http://www.modelaircraft.org



Dave Rigotti

Yann

I came across pics of the full size L39 that Savex used to paint mine after.
The plane looks kind of dirty, so I decided to weather my plane a little bit.
Dave did it first, and I have to admit that it looks really cool.
I think the panel lines and rivets show up much better now.
It's not finished yet, but it's taking shape.
Any comment is welcome...

Dave, have you maidened yours yet ?
I would also like to know how the plane lands with the Sandor type of oleos.
Eventhough I'm really happy with those that I made, I would like to compare the two setup.
I think oleos really make this plane dead easy to land.

Yann

digitech

My Feedback: (10)

good oleo,s make also other planes land easy....

jess24845030

Hi can someone tel me how you have connected the ail servo to the controll horn as this is a very short distance
thanks

Dave03B

'fraid not

Nice job weathering yours btw. Makes them look even better doesn't it!

Dave03B

I also had this problem. I have used a short piece of push rod and popped a swing keeper on the end. You must ensure there is no slop though.

HTH.
Dave

GrayUK

Dave

have you flown yet?

J.F

Nice scheme....same a mine

Blue is- STANDOX 2k system ultramarine blue RAL 5002
White color is STANDOX 2k system MIX 010
and red color is STANDOX 2k system MIX 541.

got mine put in aerosols by local paint mix company.

J

paulputman

I have now read all threads up to page 50. within all the chit chat theres a lot of useful information from knowledgeable flyers concerning the build of this combination. Pity there was not more videos in there of the L39 doing some good landings. I have just started the build. hope to have it ready for late summer.


Paul

GrayUK

Paul

Pop up to my club, i will show you good landings without oleo legs.

paulputman

I will at some point.

How many L39's have you had so far? Are you on your third still?

I saw your trio pictures - have you had all three flying at the same time at your club?? hee hee

Paul

GrayUK

Yep, still on number 3.

Still clocking up the hours.

I will be at the field this weekend, i am also test flying the Eurofighter.

If you wish to com ethen drop me a PM.

Paul

H.Dale

My Feedback: (3)

I need help!

I have had an L-39 for almost a year and haven't flown it yet.

Let me tell you what has happened. I put an autostart MW44 on it but cannot get it to run. When I installed it I accidently reversed the gas and fuel line. I corrected the problem but still no luck. I then found I had a servo that was interfering with the RPM sensor. I corrected that. Now when I try to start it it goes through the start sequence but then heats up over 800 degrees and shuts down.

I emailed Wren about three weeks ago about the problem. Sara emailed me back about a week later and told me they needed more information. I emailed her back and haven't heard from them since.

Does anyone have any idea what I should do? I had problems with a MW54 overheating. There was a problem with the combustion chamber. Sara said they didn't think this was the problem. Am I using too much gas or do I possibly have a leak in my fuel line? It seems to sputter as it begins to run on Kero.

Thanks for any help.

Hal

J.F

Short answer would be to mail Sara again, very rare that you don't get a reply, guess its just an oversight.

Long(er) answer:
I also had issues (think i spoke to you about them) a while back with starts being long and hot, but found i was just heavy handed with the gas valve after removing the restrictor that was causing me problems by not letting enought gas through! Went from one extreme to another! I was sent a "medium" restrictor to put in my gas line, and after starting 3 times in the back garden last week had some of the fastest and easist starts ever from the little beauty, could hardly believe how quick and low temp they were.
Would suggest less gas, and check for leaks in the fuel line from shut off valves or other connections...easy to spot bubbles in the clear tube, otherwise ask for a medium restrictor to put in your gas line to stop you over gassing the engine.

Jack28

My Feedback: (19)

Give Sara another e-mail, she is always fast to respond, I have always had responses overnight, there service is excellent. Give them all the info you can and I am sure your problem will be solved, Good Luck Jack.

siclick33

I have had one 'hot'start caused by starting after refuelling with the fuel tap accidentally left open. However, this was not too hot and it was obvious what had happened.


I have had a couple of hot starts caused by too much gas. These hot starts are HOT and the temperature rapidly increases (I have easily had mine over 800 with too much gas). I agree with J.F. that too much gas is probably your problem. I am not sure of the setup of the 44 autostart (mine is manual) but would try reducing the gas (by a restrictor or by closing the valve a bit if it has one). You can tell if you have restricted it too much as it won't light. In normal starting this engine uses VERY little gas.

swissflyer

while testing my second L-39 i had 2-3 hot starts...

origin: myself...

cause: i'm Id}$t..

i used the wrong starter battery..a 6 cell in place to a 8 cells...