Thanks , I was thinking about a small amounts .
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Official Freewing 80mm EDF L-39 Albatros Thread
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https://www.youtube.com/watch?v=Gv1NYL9g4K8 This is the flight... this is on a 4000mah which I didn't like the way it flew compared to the 5800mah. This plane is light on its wings and creates a lot of lift compared to other 80mm's.
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A percentage of chord is dangerous as many airplanes have fuselages or other appendages that affect center of lift.
On a new release I’ll start at the book site and adjust from there. If others have experience I’ll listen and decide if I trust their opinions.
i alway balance gear down. It’s leftover from glow/ gas days when you balanced tank empty unless the tank was behind the CG. That way I’m balancing for the most critical phase of flight, landing. But that’s my way and other do it their way. My advice is to make your own decision and be consistent. And understand your methods limitations.
Let me add that after building and a flight check to establish where I like a planes balance, checking a balance is just to make sure where a specific balance is at when putting in batteries. It’s much easier to do a quick check with the plane on its wheels.
Originally posted by Joehockey View PostHi Evan
yes I know all about CG and typically use 25 % of Mac.
However this model seems a little tedious on my stand.
Curious on why wheels down when the front gear retracts aft and would impact CG ?
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Thanks Evan , I figured it out with the use of MAC.
MAC is never a dangerous guess, its an aeronautical formula used on real aircraft that works wonders on model aircraft.
I have always used 25% of Mac to test stated CG on any model. 25% of Mac will never ever cause a model to crash from the wrong CG. The biggest challenge with the L39 is the swept wing but i did the math and I am all set.
JLam —great pics and video !
Center of Gravity Calculator
www.gsal.org › tools › cgcalc › centerofgravitycalculator
(for normal planes it should be between 30-33%, flying wings will be 20-25%) ... Simple calculator for determining The CG distance from Leading edge at the ... * Note: A 25% of MAC is generally accepted as a good starting point for the CG
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Putting "nose retract" into this thread's search gives you this:
We at Motion RC are very proud to announce the new L-39 from Freewing, coming very soon to MotionRC.com and then MotionRC.eu . This is a bird like many others
It's a mechanical system. The gear strut pushes down on a bar, which is connected to the door via a push rod. The bar is held by a spring, which pulls up on the bar, allowing the door to open when the strut no longer pushes on it.
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Originally posted by xviper View PostPutting "nose retract" into this thread's search gives you this:
We at Motion RC are very proud to announce the new L-39 from Freewing, coming very soon to MotionRC.com and then MotionRC.eu . This is a bird like many others
It's a mechanical system. The gear strut pushes down on a bar, which is connected to the door via a push rod. The bar is held by a spring, which pulls up on the bar, allowing the door to open when the strut no longer pushes on it.
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Originally posted by Mizer67 View Post
Thanks. I'm leery of any system that relies on this FW nose retract hitting resistance and still closing reliably, but may still give it a shot.
Having said that, I must admit that the one of the L-39 has never been a problem. However, the L-39 has a much shorter strut than the F7F and I believe that this type of mechanism is not well suited to retracts with long struts. The leverage (mechanical advantage) is simply not there. They require very strong retracts, ones meant for a much larger plane with larger gear.
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Just flown my first flight with the L39 on some 7 year old packs with a humble 25C rating. Its time to bump up to 45C or higher but it seems most of Hobbyking is out of good batteries.
The Graphene 6S 5000mah one are available but like the Admiral carbons are around 900 grams each, is that still OK for this jet? I'm hoping to get the Mig 29 so that battery seems a good fit. The Admirals are quite a bit more money here in Europe than in the States.
Any thoughts greatfully received.
Mark
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