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Old Nov 25, 2012, 09:09 PM
Fast Jets for Fast times
Lmeano_from_MO's Avatar
St. Peters MO.
Joined Nov 2007
1,210 Posts
This is what I did to the nose retract ply mount, itís not pretty but it is very strong. I used 2 layers of 5oz glass on both sides of the bulkhead. I also modified the steering servo mount so accept a larger servo by notching the bulkhead to make room to move it forward.

This is what I came up with for the thrust line using string to visualize. I will remake 2 fan mount bulkheads next and fit the ducts. It looks like the inlets can be cut back to allow the fan ducting to move forward an inch or more. The CS12is a long assembly to fit.
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Old Nov 26, 2012, 03:28 AM
Registered User
Australia, NSW
Joined Mar 2011
221 Posts
Hello guys I have another question I have spektrum tm1000 telemetry module that I want to use on this jet but since the batt/data port on the rx is being used by sbec since I'm using opto esc any ideas on where can I plug this on my rx

Can I use a y cable for sbec and tm 1000 ?

Thank you
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Old Nov 26, 2012, 10:01 PM
Mile High EDF
420flyboy's Avatar
United States, CO, Denver
Joined Jul 2011
967 Posts
Here it is
Wemotec 8s 1600kv
2x4000mah
Retracts
100A esc
AUW ?
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Last edited by 420flyboy; Nov 26, 2012 at 10:43 PM.
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Old Nov 27, 2012, 12:12 AM
Registered User
Boostoman's Avatar
Oman, Masqat
Joined Apr 2010
321 Posts
Quote:
Originally Posted by Force10 View Post
Hello guys I have another question I have spektrum tm1000 telemetry module that I want to use on this jet but since the batt/data port on the rx is being used by sbec since I'm using opto esc any ideas on where can I plug this on my rx

Can I use a y cable for sbec and tm 1000 ?

Thank you
yes you can use a Y cable
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Old Nov 27, 2012, 01:20 AM
edf flyer
Mannyman535's Avatar
United States, CA, Marina
Joined Feb 2009
1,202 Posts
Retracts

Quote:
Originally Posted by 420flyboy View Post
Found some struts that will work.
http://www.pw-rc.com/product_info.php/products_id/2866
L-39 scale wheels and struts.

You just have to gently persuade the thrust tube to fit through the rear of the fuselage , little trimming maybe
Question. What's size are the pins 3mm or 4mm the items doesn't specify
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Old Nov 27, 2012, 09:33 AM
Mile High EDF
420flyboy's Avatar
United States, CO, Denver
Joined Jul 2011
967 Posts
Quote:
Originally Posted by Mannyman535 View Post
Question. What's size are the pins 3mm or 4mm the items doesn't specify
I think they are 3mm , I just drilled them to 5mm .
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Old Nov 27, 2012, 09:37 AM
Some Girls r Bigger thn Others
swps's Avatar
USA, UT, Cedar Hills
Joined Jun 2010
1,422 Posts
Quote:
Originally Posted by 420flyboy View Post
Here it is
Wemotec 8s 1600kv
2x4000mah
Retracts
100A esc
AUW ?
I have to say I'm surprised it's not a Jetfan 90!

Can't wait to see video!
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Old Nov 27, 2012, 09:52 AM
Mile High EDF
420flyboy's Avatar
United States, CO, Denver
Joined Jul 2011
967 Posts
Me too, thought I'd try a wemotec , just for speed .
This jet comes out very tail heavy , was my thinking to build lite, wemotec and 1600kv motor weigh around 325 grams combined. I have the esc under the front retract and I'm using a 1700mah 2s LiFePo 20-40c nano for servo power.
Right now fully loaded , when I push down on the tail , it barely falls to the front retract , thinking I'm close to CG.

I will always love the jetfan , rocking it in my habu and F4

Maiden video soon !
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Old Nov 27, 2012, 03:12 PM
Registered User
United States, FL, Hollywood
Joined Aug 2010
1,565 Posts
Food for thought if you are about to maiden. Check the description on this link as regards to CG.
http://www.scaleflying.com/Aero-L-39...an_p_2523.html

My flights have been successful using this tip with the L-39 I bought from them.

Which CG is recommended on this forum?
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Old Nov 27, 2012, 04:54 PM
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nerv's Avatar
United States, CA, San Jose
Joined Jan 2007
347 Posts
I set mine at 60mm (or 80mm measuring from center of the wing), I had 3 flights so far, all ended up in bad landing due to speed too slow and nose gear touched the ground first....Somehow I can land my cmp T-45 hawk better than this...
Urrl, I watched your video, all have perfect landing, maybe you can share some experience how you land this thing...
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Old Nov 27, 2012, 05:57 PM
Mile High EDF
420flyboy's Avatar
United States, CO, Denver
Joined Jul 2011
967 Posts
If its landing nose first , I'd say you need to adjust your cg.

And when you say 80mm from center of wing , you mean how we usually measure cg , at the wing root , next to the fuselage and back 80mm ?
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Old Nov 27, 2012, 06:16 PM
Registered User
nerv's Avatar
United States, CA, San Jose
Joined Jan 2007
347 Posts
I think there are 2 ways of meauring the CG, one is from HERB's blog:
http://www.rcgroups.com/forums/showt...&goto=lastpost
One of the pic will show you the correct CG, I started mine at 75mm, broke front landing gear on landing, then I moved it back to 80mm, still nose first, I started to think I slowed it down too much, and it stalled on nose (good it didn't stall on tip)
The other way is what Urrl suggest, 24cm away from the center of the wing, and 55-60mm from leading edge.
Both ways give you pretty much the same CG.
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Old Nov 27, 2012, 06:39 PM
Mile High EDF
420flyboy's Avatar
United States, CO, Denver
Joined Jul 2011
967 Posts
Cool , thank you
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Old Nov 27, 2012, 08:10 PM
Registered User
United States, FL, Hollywood
Joined Aug 2010
1,565 Posts
Quote:
Originally Posted by nerv View Post
I set mine at 60mm (or 80mm measuring from center of the wing), I had 3 flights so far, all ended up in bad landing due to speed too slow and nose gear touched the ground first....Somehow I can land my cmp T-45 hawk better than this...
Urrl, I watched your video, all have perfect landing, maybe you can share some experience how you land this thing...
I don't know of any tips other than I land with flaps deployed and I don't seem to want to lose a lot of speed so as to make the landing unstable and I stand near the beginning of the landing strip as I can judge better when I'm landing, watching the rear of the aircraft after it passes me, which I did not do on the maiden. I usually fly early in the morning, sunrise if possible, before the wind has a chance to pick up.

Here's some of my flights and landings if anyone is interested.

CMP L-39 Maiden Flight (2 min 57 sec)

CMP L39 flight 6 (2 min 56 sec)

My L-39 8th and 9th flights (7 min 20 sec)

My L-39 flight 15 (2 min 51 sec)

My L-39 inverted flying Markham Park (3 min 13 sec)

My L-39 runs out of battery power in flight (2 min 24 sec)

Notice on the maiden flight I glided in instead of using a small amount of engine and there was a considerable bounce. But I was pretty inexperienced with this jet at that time. In fact I am studying my own videos as well as others to get re-aquainted with landing the L-59 which I hope will arrive next week undamaged.
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Last edited by urrl; Nov 27, 2012 at 09:02 PM.
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Old Nov 27, 2012, 09:46 PM
Mile High EDF
420flyboy's Avatar
United States, CO, Denver
Joined Jul 2011
967 Posts
Watched them all , thank you
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