RE: L39/Wren 44 Pics and video  
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RE: L39/Wren 44 Pics and video - 1/13/2004 9:21:13 AM   
sky warrior



Posts: 166
Joined: 9/11/2002
From: TWICKENHAMMIDDX, UNITED KINGDOM
Status: offline 		Hi Rick,
I had a Jet Cat 120 before in one of my large model projects which I became apprehensive about flying. This started and stopped faultlessly every time.
I too was a bit worried about the "Self starting flame out the back brigade " I had also seen at the flying sites. Things have moved on now and this M44 unit is well sorted. I took about 7-8 starts to become relaxed and familiar with it but it works, and works very well.
The extra weight is worth saving because the real Savex.cz L39 with the carbon reinforcement throughout the fuselage does come out tail heavy and you are looking for nose weight anyway. (I changed the supplied 500mah 3.6v pack for a home made 2400 mah 3.6v pack to drive the ECU. It works perfectly on the original but I needed weight so ! ) Think about the extra weight in the wrong place and its more nose weight so I believe its not worth the effort and cost. This unit works and my complete plane on the stand as seen in this forum goes in my medium size estate car complete, wings fixed as photo. No more dodgy unecessary unplugging and plugging up! Always a possible reason for failure.
You wont regret this choice as everyone who has flown these units likes them a lot.

< Message edited by sky warrior -- 1/13/2004 9:24:37 AM >

(in reply to rpmtech)
       Post #: 76

RE: L39/Wren 44 Pics and video - 1/13/2004 9:47:55 AM   
rpmtech



Posts: 580
Joined: 3/14/2002
From: green valley, AZ, USA
Status: offline 		Hi, I guess that came out wrong. I dident mean I was afraid of hot starting the engine, which I have never done, just that it would be cool to not be all up in the model during the start sequence. You know, kind of stand back and operate the start sequence, it adds to the illusion.

I suppose you're right, if that extra 3 oz is behind the CG, you have to add another weight to the nose. The little hatch is fine then.
How much weight have you guys had to add to the nose if any?

I like your Robart strut on there, do you have some on the mains? I was thinking to do that or to have the wire with the knee for shock on the mains. I always put shock gear on my planes.

(in reply to sky warrior)
       Post #: 77

RE: L39/Wren 44 Pics and video - 1/13/2004 10:44:04 AM   
sky warrior



Posts: 166
Joined: 9/11/2002
From: TWICKENHAMMIDDX, UNITED KINGDOM
Status: offline 		Hi
Works fine with 8 guage wire bent to shape. I have milled out the underskin of the wing and re-expoxy glassed the skin back to the wheel well with wing skinning cloth, to give appx 2-3mm more clearance for wheel to lockup with great certainty. This is not absolutely necessary but if the gear bends a bit from time to time it ensures a good lock up.The Robart wheels work well as they cushion the landings well as being slightly soggy and this give a braking effect on tarmac. Appx 200 g in my nose. I personally dont even have a coil in the leg. Mine is just a straight bend and it works fine.

< Message edited by sky warrior -- 1/13/2004 10:52:24 AM >

(in reply to rpmtech)
       Post #: 78

RE: L39/Wren 44 Pics and video - 1/13/2004 11:03:07 AM   
Vincent



Posts: 2590
Joined: 12/7/2001
From: Phoenix, AZ, USA
Status: offline 		What is the wingspan of the L-39?? how hard is it to see in the air?? Do you guys typically keep her in close while flying.
V..

(in reply to sky warrior)
       Post #: 79

RE: L39/Wren 44 Pics and video - 1/13/2004 11:27:41 AM   
sky warrior



Posts: 166
Joined: 9/11/2002
From: TWICKENHAMMIDDX, UNITED KINGDOM
Status: offline 		Hi yer,
Gray gave the dimensions in an earlier post 1400 mm long 1270 wingspan and if you look at an earlier post of mine you can see I fly with orange wingtips and tail streaks. But I am older than Gray but not old and Grey ! O.K.

< Message edited by sky warrior -- 1/13/2004 11:29:44 AM >

(in reply to Vincent)
       Post #: 80

RE: L39/Wren 44 Pics and video - 1/13/2004 1:12:17 PM   
GrayUK



Posts: 2705
Joined: 10/7/2003
From: Dunstable, UNITED KINGDOM
Status: offline 		You will naturally fly closer, it is not something you do deliberately but you soon establish your comfortable vision limit. You can still fly wide jet type maneuvers , you do not have to jerk it around. The other thing you will find (and this has been said by all that fly them) it does not 'feel' like a small model in the air, it is not twitchy and does not bounce about, once airborne it could be twice the size.
Don't forget, it is not that small! If you fly a 40/60 sized aerobatic model it is no different. The only issue is speed, this model on full power is fast, when you first start to fly it, it is best to keep to 2/3rd throttle, using full power in the vertical, when you have become accustomed to her you can open it up!
I have had no visibility issues while flying it, it stands out well and the tip tanks really help.
As was suggested, you can spray tip tanks fluorescent to help.

I have about 5 oz of lead in nose.

I know i am old and Grey, but young at heart!

(in reply to sky warrior)
       Post #: 81

RE: L39/Wren 44 Pics and video - 1/13/2004 1:50:53 PM   
SJN



Posts: 4362
Joined: 9/28/2002
From: Copenhagen, DENMARK
Status: offline 		GrayUK, thanks for the pictures. Very good.

I'm receiving my kits Thursday, or Friday this week!

Your a brave man using those servos in a jet
The guys here would never let me fly with that equipment, when its checked for airworthiness.


SJ.

(in reply to GrayUK)
       Post #: 82

RE: L39/Wren 44 Pics and video - 1/13/2004 5:56:28 PM   
GrayUK



Posts: 2705
Joined: 10/7/2003
From: Dunstable, UNITED KINGDOM
Status: offline 		Not at all, you have to remember that this is a light model, loads are way down, I use Futaba mini servos on all but rudder which is Hi Tech, A friend of mine uses mini Hi tech on all functions, he must be getting on for 100 flights, no problem.

This is part of the beauty of having one of these planes, all costs drop, but the fun remains the same!
You have to change the way you think, still safe but, do i really need to spend £70 on a servo?(7 of them!)
Why buy £120 worth of wheels? I can put a £10 set on and they will last for years.
It is only when you have built it and pick it up for the 1st time, without bursting a blood vessel that you really realise!

(in reply to SJN)
       Post #: 83

RE: L39/Wren 44 Pics and video - 1/13/2004 7:04:55 PM   
rpmtech



Posts: 580
Joined: 3/14/2002
From: green valley, AZ, USA
Status: offline
quote:

The guys here would never let me fly with that equipment, when its checked for airworthiness

Half of them have alot more money than flying and building skill {that jet masters crash video confirmed this}
Thats the exact kind of thing that keeps me away from AMA fields, the "experts" and politicians of model flight
I hope you UK guys have it better.

There was a day when all we had was regular non digital servos, and golly gee whiz the planes flew fine! even fast ones!

I guess the laws of physics has changed, making analog servos not work anymore. Remember this is exactely the same as a very fast .60 sized airplane, shouldent need anything special.

(in reply to GrayUK)
       Post #: 84

RE: L39/Wren 44 Pics and video - 1/13/2004 8:25:01 PM   
GrayUK



Posts: 2705
Joined: 10/7/2003
From: Dunstable, UNITED KINGDOM
Status: offline 		Yes i agree, you are spot on with that, when you have heavy models, you have to think different, and for some reason everyone seems to have been brainwashed. As you say we flew for years without a digital servo in sight, it worked and worked well.
I have seen models almost lost due to the heavy drain digitals put on the batteries, so now you need more batteries....more weight...more load on servo's...and so on.....and so on..... That is one of the main reasons i have gone this way, it is more 'normal modelling' fairly standard technology, normal flying fields, and not so nerve destroying!

I really love enjoy turbine flying now, its is so relaxing not to have the value of a family car in the air, hanging on the durability of a small piece of quartz!

(in reply to rpmtech)
       Post #: 85

RE: L39/Wren 44 Pics and video - 1/13/2004 8:27:03 PM   
GrayUK



Posts: 2705
Joined: 10/7/2003
From: Dunstable, UNITED KINGDOM
Status: offline 		SJN
What colour scheme have you chosen?

(in reply to SJN)
       Post #: 86

RE: L39/Wren 44 Pics and video - 1/13/2004 8:46:52 PM   
SJN



Posts: 4362
Joined: 9/28/2002
From: Copenhagen, DENMARK
Status: offline 		The ordinary red/white/blue one for myself. The other one for my freind is the Sierra Red/blue/yellow one.

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(in reply to GrayUK)