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L39/Wren 44 Pics and video

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L39/Wren 44 Pics and video

Old 01-11-2004, 04:10 PM
  #51  
sky warrior
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Default RE: L39/Wren 44 Pics and video

REPLY TO SJN

Buy the Wren you wont regret it.

Why would I think of buying a second if I was unhappy with the first!!

Its not Gray thats just O.K. I am O.K. too there nothing wrong with my head ask Gray cause he said I was O.K.too.. O.K.

Question for SJN:
Why carry a starter motor when the units starts very well without an onboard starter !

Answer is you dont, unless you want the plane to weigh that bit more which is fine on a 20lb model but we are talking 10.5 lb all up with fuel,and fully loaded !

Remember, starters mean extra batteries and all that goes with it. So you could say, I will start it with batteries not onboard and then will only carry the starter. Thats what we are doing, and not even having to carry the starter.

They fly better when they are lite so I am told. well we are enjoying ours with the Wren!
Old 01-11-2004, 05:16 PM
  #52  
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Default RE: L39/Wren 44 Pics and video

Laura,

I got a DA 150 on a Hyde mount in a 90% built 42% Cap 232 (same as Alis) with all the gear including 8 Digital FET servos up for grabs.

Dave Stephens
Old 01-11-2004, 05:29 PM
  #53  
Laura H
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Default RE: L39/Wren 44 Pics and video

Dave,
My dad has ordered a Fiberclassic Extra (2.6m) colour scheme like the one you had at that Nationals stand in place (Fantasy Red).
I will tell my dad though, and will let you know if he is interested.

Laura
Old 01-11-2004, 10:56 PM
  #54  
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Default RE: L39/Wren 44 Pics and video

Ill take some pics when the planes arrive.

Im quite sure that you will have the option of a start motor on the engine. The website is not very informative.....But Denmark is a small country, with a small jet comunity.......you hear stuff :-)

"Why carry a starter motor when the units starts very well without an onboard starter ! "

Simple. I dont like the large hatch you have to make in the fuselage so you can insert the starter wand.

Having the starter motor hardly adds any weight. The 8 cell batt pack to run it, stays out of the plane. You only have it connected during start-ups...


Heres a pic of a modified wren with start motor.
and one with the hatch....
Which one would you prefer.....

SJ.
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Old 01-12-2004, 07:45 AM
  #55  
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Default RE: L39/Wren 44 Pics and video

The picture at the bottom is my plane, the one at the top is a friend of mine. Both use the wand.

You also show a photo of a L39 with on-board start - it's Gaspar's, the only
Autostart Wren 44 in the world! It's been on RCU before, it's an experimental one, and not available. Gaspar's
part of the Wren team, of course, so he's allowed to meddle with engines.

There may be a on-board starter for the 44 at some time in the future, but the truth is, it is so simple and economic on weight to use the wand i wonder if it is needed. I was concerned at 1st but there is no need, it works and has no mechanism to go wrong.

With relation to the Simjet, if you remember the web site used to say they were going to supply with starter on board but have changed the web site recently to do away with it and go back to the wand. So the whispers may be based on old info??
The other thing to remember is the the 44 has been in production now for 9 months (i think) has a good proven track record, the Simjet is not even released yet, we don't even know when it will be.

So in answer to your question 'which do i prefer?' i will take the last picture with the hatch! it is, after all, mine anyway, has flown at least 100 flights and the engine performs beautifully.

I look forward to your pictures, did i send you the engine mount drawings or photo's of installation?
Let me know if you need them i will send them on.

P
Old 01-12-2004, 07:56 AM
  #56  
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Default RE: L39/Wren 44 Pics and video

I have some experience with a fried's MW-54 with the starting wand. I agree with GrayUK: it is so easy, simple and works so well. Save the weight and use the wand. Unless you absolutely can not access the front of the engine, I'd forget about an on-board starter!
Old 01-12-2004, 08:54 AM
  #57  
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Default RE: L39/Wren 44 Pics and video

only onboard starter in the world ?

who`s is this then [8D]
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Old 01-12-2004, 09:01 AM
  #58  
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Default RE: L39/Wren 44 Pics and video

GrayUK, I would very much like the drawings for the mount.
Please send to [email protected] if you would be so kind.

Nothing is final on the simjet engine yet..... I realy dont have much first hand information.
Lets see what happenes.

But I would still rather have the starter onboard [8D]


SJ.
Old 01-12-2004, 12:14 PM
  #59  
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Default RE: L39/Wren 44 Pics and video

That is a non production early prototype belonging to Wren, although it is fundamentaly a Wren 44 it is not as produced and sold. It was made for experimentation.
Gaspar's engine is a production engine modified by him.
Will send info tonight

P
Old 01-12-2004, 01:08 PM
  #60  
L Turner
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Default RE: L39/Wren 44 Pics and video

Paul,

That L39 is sure an appealing looking plane. However, apparently, it must have both rudders and brakes to be 'legal' in the US under the latest proposed AMA regulations (see todays thread 'New rules presented by AMA').

Does the Savex L39 have an operational rudder? What size wheels does it use?

Finding a set of light weight wheels & brakes for the class of MW44 powered aircraft is going to be a problem on this over-regulated side of the pond.
Old 01-12-2004, 02:44 PM
  #61  
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Default RE: L39/Wren 44 Pics and video

No problem Laura, dont need to sell it, its just getting in the way!!

L Turner
if you order with a working rudder you get a working rudder!! and yes you can have brakes.

The hatch for starting dont have to be big and ugly,

I just cut mine out and hinged at the top with clear hinge tape and glued a mylar hinge as a catch on the bottom, you just bund the hinge tab down and push it shut and it pops into place. To open i just put py finger in the intake and pop it open. ( i have included some pics to help explain) also mine is the "other" savex not the good one although mine did come out at 7Lb 2oz dry.

Dave Stephens
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Old 01-12-2004, 02:52 PM
  #62  
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Default RE: L39/Wren 44 Pics and video

Looks good Dave.

Also looks a little hot in the engine bay :-)

SJ.
Old 01-12-2004, 03:05 PM
  #63  
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Default RE: L39/Wren 44 Pics and video

Rudder...
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Old 01-12-2004, 03:11 PM
  #64  
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Default RE: L39/Wren 44 Pics and video

yep i hade a very hot start!! my fault, i was starting and it would not ramp up, then i realiased that i had the fuel tap off. like a idiot i then turned it on, the pump was going flat out and woooosh !!! a quick burst with the extinguisher sorted it. i have hardly any heat shielding in there (just a small amount over the carbon elivator pushrods)
Dave
Old 01-12-2004, 03:26 PM
  #65  
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Default RE: L39/Wren 44 Pics and video

Dave
Hi mate how is it going?

SJN

Is that your new kit?
Old 01-12-2004, 03:52 PM
  #66  
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Default RE: L39/Wren 44 Pics and video

no no...just pics I found somewhere..
Old 01-12-2004, 04:02 PM
  #67  
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Default RE: L39/Wren 44 Pics and video

SJN
I am e mailing you the pics and engine mount drawing

Paul
Old 01-12-2004, 04:22 PM
  #68  
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Default RE: L39/Wren 44 Pics and video

As Dave said, just order rudder it comes fitted as shown, fantastic hinge, well made, wheels are about 2.5inch if i remember
On the pics you can see the engine bay of the 'better' L39 note all carbon fibre.
Pic of rudder and servo.
I have also included the engine mount drawings everyone keeps asking for, works perfectly with Wren 44. Set up as shown and you will get the correct thrust line as well. My friend Joe did an original version, this is the refined one. Hope it helps you all.

P
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Old 01-12-2004, 04:57 PM
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Default RE: L39/Wren 44 Pics and video

Hi guys, I am joining your club of L-39 with mw44, I would like to know what kind of servos you guys are using {size} and the spring air gear type. Also does anyone have a starter motor fitted. a plug in setup for starting would be great.

Rick
Old 01-12-2004, 07:14 PM
  #70  
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Default RE: L39/Wren 44 Pics and video

Hi
Welcome to the 'sensible turbine model club'
I use standard mini servo's on all functions apart from the elevator, which uses a normal size servo. You don't need to spend big money on servos for this moderl because of its weight. I use the same servo's as i use in electric models! I can knife edge this model with a 2.5 kilo servo on the rudder. Springair retracts standadard size, 300 i beleive but MUST be slim line, the standard will not fit in the wing. I use normal bulkhead mount nose leg (former is in anyway!).Picture below.
If you need any other info let me know.
Do you have a Wren 44?

P
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Old 01-12-2004, 07:17 PM
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Default RE: L39/Wren 44 Pics and video

Hi there,
here are a few things I chose to do which suit me and my style of flying.
I use Hi Tec thin wing servos 5251 for the flaps and ailerons although they dont have to be the digi versions though ( I had some digi ones from a previous disaster). I also use two JR 3321 servos on a matchbox for the elev.( these are placed either side of the turbine with foil and a little ceramic wrapping..very thin though. However this is the system I have chosen, others have just on servo with a wire yoke to both elevs , its a matter of chioce.
I am lazy and found it easy to adjust the two surfaces in this way but there you are. I have also found that out of the box(the SAVEX.CZ)one that is, it seems there is an inbuilt incidence in the tail plane which gives appx 2mm down elev trim. I chose to trim this out on the second airframe with appx 2 mm of up front edge tailplane incidence and glued it up there. It now runs without trim and at neutral elev.
I also found the aileron and elve settings quite twitchy for my nervous style of flying and increased the aileron and elev movement but not the effect by shortening the lenght of these surfaces by I inch in each case from the outboard ends ( both ail and elev). I fixed these securely in place and found I now have appx 7-8 mm of throw and not 3-4 mm as bought. I like this and it works well for me as I now have 75-80% servo movement with good resolution at centre and good trim control on the click trims. I have experienced no vices at all from this modification. I also have full powerfrom the sevos. I made up oleo from a Robart leg which looked as if it was made for this model.
I chopped about 1/4" of the bottom yoke and silver soldered it back together and this gives a great noseleg oleo ( with a Du Bro tail dragger wheel used as the nose wheel ). I dont have brakes but do use 2 3/4' Robart wheels. If you must have brakes (you dont need them if you have enough flap anyway) then try Tower Hobbies as they sell a brake unit called "Compact Unibrake" which I understand fits all Robart wheels. Try their site they have a selection.
Ah well there we are its all up the individual which is what makes this hobby interesting.
I enclose a shot of the oleo for you interest.
Bye.
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Old 01-12-2004, 07:17 PM
  #72  
GrayUK
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Default RE: L39/Wren 44 Pics and video

You can see from communication above that this is an interesting point with regard to onboard starters. The Wren 44 comes with hand start only at this time, it is not a problem, easy to use, no extra weight.
Old 01-12-2004, 07:20 PM
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Default RE: L39/Wren 44 Pics and video

Where is the Oleo?
Old 01-12-2004, 07:31 PM
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Default RE: L39/Wren 44 Pics and video

Its on its way its a bit like me these days it takes longer to do some things !
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Old 01-13-2004, 03:58 AM
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Default RE: L39/Wren 44 Pics and video

Welcome to the 'sensible turbine model club'
Yes thanks, I was going to do a big AD Mirage, then I thought about it and about how much more fun I would probably have with this little jet. I really dident want another R/C vehicle that is more like a job to operate than fun, not to mention driving miles and miles to fly it, it would end up just sitting in my shop. After a few very complex models this will be a nice change. Wire struts, standard servos,brakes only if you want them,cheap foam tires, one person can carry the plane and load it in the car, looks scale and flys great, I love the thought of it!

Any pictures you care to post would be great, I do like the idea of the onboard motor mounted to the front of the engine, I really doubt the plane would care about that extra few ounces. My last turbine was full manual start (old GWM FD) so I like the idea of just plugging in lines and starting it from a few feet back. What do you think?

I dont have the combo yet, but I am curious on the start procedure, is this it?: turn the motor over,stop, add fuel and ignition, when lit continue turning the motor over until self cooling rpm is reached, slowly close propane valve until it's at idiling rpm?

Thanks alot for your help,

Rick

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