HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Feb 08, 2002, 11:45 PM
I'll fly anything...
GlasairAllen's Avatar
United States, CA, Palm Springs
Joined Aug 2001
502 Posts
K&A L-39 with Retracts?

Has anyone fitted a K&A L-39 Albatros with retracts?

I have been flying quite a bit at my local flying club's field and I'm really getting spoiled by the long paved runway. Lately I find the idea of packing up the bungee, pedal launcher and driving to a park that may or may not have people playing soccer on it increasingly unapealing. I would love to take the L-39 to the flying field and use the runway.

If I decide to do this I'll probably get another kit and lighten it up a bit to compensate for the weight of the retracts.

Anyone done this with positive results?
GlasairAllen is offline Find More Posts by GlasairAllen
Reply With Quote
Sign up now
to remove ads between posts
Old Mar 06, 2002, 09:01 PM
I'll fly anything...
GlasairAllen's Avatar
United States, CA, Palm Springs
Joined Aug 2001
502 Posts
K&A Albatros Retracts

Well, I'm about to do an experiment with the K&A Albatros. Today I put fixed gear on it just to see if it will ROG ... or how much of the runway (and battery) it burns up getting off the ground.

If this works I'll get another kit and do it with retracts.

Stay tuned...

(no photos, the camera lost it's mind today and did not save the photos of the L-39 sitting on it's gear)
GlasairAllen is offline Find More Posts by GlasairAllen
Reply With Quote
Old Mar 06, 2002, 09:55 PM
EDF all the way!
bruff's Avatar
Gilbert, Az
Joined Jun 1999
7,939 Posts
Retracts

Contact Robert at EJF he has a new set of metal retracts that are smaller than the micro Spring Air's. I'm putting a set in a F-86. Good Luck!
Bob Ruff
bruff is offline Find More Posts by bruff
Reply With Quote
Old Mar 06, 2002, 11:02 PM
Registered User
ScottS's Avatar
Houston,TX
Joined Mar 2000
1,217 Posts
How do you plan to get retracts in that thin wing?

I think ROG would mostly depend on how much power and runway. I know I could put wheels on mine and ROG, but I like getting 50+ mph without turning the motor on. I also think the drag would limit top speed with fixed gear.
ScottS is offline Find More Posts by ScottS
Reply With Quote
Old Mar 07, 2002, 09:34 AM
I'll fly anything...
GlasairAllen's Avatar
United States, CA, Palm Springs
Joined Aug 2001
502 Posts
Photo

Photo of the Alby on gear
GlasairAllen is offline Find More Posts by GlasairAllen
Reply With Quote
Old Mar 07, 2002, 09:36 AM
I'll fly anything...
GlasairAllen's Avatar
United States, CA, Palm Springs
Joined Aug 2001
502 Posts
Re: Retracts

Quote:
Originally posted by bruff
Contact Robert at EJF he has a new set of metal retracts that are smaller than the micro Spring Air's. I'm putting a set in a F-86. Good Luck!
Bob Ruff
I've seen Robert's retracts and they look great. I'll probably use them on my YF-23. ...But pneumatic retracts seem a little overkill for a model this size. Also I can't imagine that they are any lighter than Robart's little micro mechanical retracts ... are they?
GlasairAllen is offline Find More Posts by GlasairAllen
Reply With Quote
Old Mar 07, 2002, 10:11 AM
Dude, where's My Plane?
JasonJ's Avatar
Green Lane PA USA
Joined Mar 2001
2,167 Posts
Ehhh, why not just make a little dolly for it, then it can just lift off and leave the wheels on the ground where they belong . Maybe when you get good enough at landing it on a dime, you can try to land on the dolly .
Hey how about this, make a Dolly out of a RC car and get your buddy to drive it down the strip while you man the sticks .
We could call it the Buggy launch!
That would be cool!
JasonJ is offline Find More Posts by JasonJ
Reply With Quote
Old Mar 07, 2002, 10:46 AM
Registered User
racine, wi
Joined Jan 2001
339 Posts
I put mechanical retracts on my f86. Used great planes 30 size retracts - figured it would be needed on a 6-7 pound plane and a grass runway. I havent flown it yet. Each retract weighted 1.75 ounces. Figure that .75 of this was the wire landing gear, which you would need anyway on a paved runway. So retracts add about 3 ounces plus 2 servos to operate-figure 4-5 ounce penalty for mechanical retracts. Shouldnt effect flight much

How much lighter are the pneumatic ones???
bpu6999 is offline Find More Posts by bpu6999
Reply With Quote
Old Mar 07, 2002, 10:31 PM
I'll fly anything...
GlasairAllen's Avatar
United States, CA, Palm Springs
Joined Aug 2001
502 Posts
Well, it's over for the L-39

My L-39 now hangs in the hall of shame in our shop

Here's what happened. The gear was installed as a test only so I did not bother making the nose gear stearable. I figured that our runway is wide enough that I could yank it off the ground (soft/short field takeoff style) before it wandered off the pavement. On the first takeoff attempt it rolled about 50 feet and was starting to get close to takeoff speed when it left the pavement and went into the rough. I shut down the power and let it bouce to a stop.

Nothing was damaged so I decided that I'd just try to hand launch it (never done it before by myself, have had others launch it for me with mixed results). ... A good run and throw as hard as I could while trying to keep one hand on my JR 10X, the plane bobbed and floundered for a few feet and them did a belly-flop on the paved runway. Of course the landing gear was a total loss, but worse than that the fuselage has millions of little stress cracks now. It's probably fixable but I'm already right at the limit of max flying weight for this thing and I know that repairing it will only add more weight.

I'm ordering another one from K&A tomorrow. It's a great plane and I want to fly it again. I have not given up on ROG ... the next one I build will have retracts ... and a steerable nosewheel

... hmmm, maybe a few Estes rocket JATO rockets next time
GlasairAllen is offline Find More Posts by GlasairAllen
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Build Log K&A Models new all molded L-39 with retracts Ken Williams Electric Ducted Fan Jet Talk 147 Mar 30, 2008 01:23 AM
K&A L-39 with fixed gear U812 Electric Ducted Fan Jet Talk 58 Sep 17, 2003 10:19 AM
K&A L-39 steve neill Electric Ducted Fan Jet Talk 19 Mar 26, 2002 06:27 PM
K&A L-39: Empty weight Niels Electric Ducted Fan Jet Talk 3 Mar 07, 2002 10:59 PM
K & A L-39 Gas conversion gwb Electric Ducted Fan Jet Talk 0 Oct 17, 2001 09:08 PM