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Old Feb 08, 2012, 11:45 AM
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WOW! That is scale! The floats and lights are great!
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Old Feb 08, 2012, 11:45 AM
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Bavaria, Germany
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Quote:
Originally Posted by PeteSchug View Post
Ho, ho

That's a definite maybe(not)

I've learned to be skeptical until the thing is in my hand!

Pete
Feb.28th is what I heard from the guys at the Horizon sales stand. I doubt that as well...even though I wish it will be. The sooner the better, really!

cheers
Uwe
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Old Feb 08, 2012, 11:49 AM
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Quote:
Originally Posted by MrWokn View Post
I think it said Feb 28th at the toy fair review
That date is wrong. Should be end of March or early April.

Seth Arnold
Horizon Hobby
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Old Feb 08, 2012, 11:55 AM
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Thanks Seth

Now we know...

Could you maybe check if the wheels of the E-Flite Grasshopper could be used as "Tundra Tires"?

thanks
Uwe
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Old Feb 11, 2012, 06:48 AM
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I was actually just looking to buy a cub, didn't want a 3ch, or something huge and was having a really hard time finding something of high quality...now my decision is made! Thanks Eflight!

Now, a question: are the flaps really effective in a bird this size? I'd love to see some comparative TnGs. Or I guess I can let you know in April!
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Old Feb 11, 2012, 08:13 AM
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Quote:
Originally Posted by ScottGridley View Post
I was actually just looking to buy a cub, didn't want a 3ch, or something huge and was having a really hard time finding something of high quality...now my decision is made! Thanks Eflight!

Now, a question: are the flaps really effective in a bird this size? I'd love to see some comparative TnGs. Or I guess I can let you know in April!
When you fly in a full-scale plane the effect of the flaps is unmistakeable.

I've had flaps on three different quarter scale planes and their effect seems much less obvious. I'm sure they work, but watching from outside the plane the flaps are just not as dramatic as when you are in the plane. I'd really have to shoot a lot of landings both ways before I could tell the difference.

As for climb I've never used them on takeoff.

Since this Cub has floats available the flaps might be more noticeable taking off from water than from land and maybe even reduce the possibility of flipping on a poor landing.

Dunno, I like the fact that they are there, but I don't expect too much from them.

Pete
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Old Feb 11, 2012, 10:01 AM
Addicted
United States, CO, Parker
Joined Dec 2011
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I checked out the new UMX Gee Beeand upon inspection I thought about this thread. My idea? Can the Gee Bee wheels be used as tundra tires on the CC? Not sure how big the CC wheels are.
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Old Feb 11, 2012, 10:38 AM
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Flaps on RC planes

Regarding flaps on models - my experience has been similar to Pete's. Flaps have a dramatic effect when you're in the plane, but the effect is usually less noticeable from the ground. I've had flaps on a number of models over the years - from 1/4-scale down to 40-size. They're very effective on my 1/4-scale Super Cub. With full-flaps deployed, I can do a much steeper approach without overshooting the runway. A notch or two seems to shorten the takeoff run, but the effect is less dramatic - especially during full-throttle takeoffs. Likely, because the plane's power-to-weight is so much higher than the full-scale. When I execute scale takeoffs, I typically use 2/3-throttle. In that situation, a notch or two of flaps on takeoff is noticeable. My 80" wingspan Taurus Plus has slotted Fowler flaps that can extend to 90 degrees for use as airbrakes. They are very effective on approach and takeoff. When I'm carrying a payload (the plane can carry nearly 20 pounds), a couple notches of flaps very noticeably shortens the takeoff run. When dropped 90 degrees, they make extremely effective airbrakes. I can descend at a 60-degree angle or greater without picking up speed.

The effectiveness of flaps tends to diminish at smaller scales, but it doesn't disappear. However, the type of flaps & the specifics of how they are implemented will dramatically affect their performance - regardless of scale. Again, I think that the overpowered nature of most models masks the effects of flaps on takeoff. Their effect is much more noticeable at higher wing-loadings & at lower power-to-weight ratios.

Will flaps be effective at this scale? I have no doubt that they will work. Will they make enough difference to be noticeable from the ground? On approach, most likely, yes. On takeoff, this will depend upon the power to weight & one's flying style. If the CC has enough power @ WOT to leap from the runway in a few feet, flaps won't make much difference. I mean, if you're already taking off in 5-10 feet & climbing out at a 70-degree angle without flaps - how would you notice? If one executes scale takeoffs (which will likely require 50% throttle or less), their effectiveness on takeoff should be more apparent. Also, their effect will be more apparent when carrying a payload - such as a keychain cam or FPV setup.

Deploying flaps may cause a change in pitch. It depends upon the airframe design & the details of how the flaps are implemented. Some planes may pitch up, others may pitch down, while others will not change pitch at all. The higher the airspeed at which the flaps are deployed, the more pronounced any pitching effect will be. RC pilots tend to deploy flaps at speeds that are much too high, which exaggerates any pitching tendency.

Mixing a bit of elevator with the flaps usually takes care of any inherent pitching tendencies, but one should first make sure that the issue isn't caused by excessive airspeed.

Joel
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Old Feb 11, 2012, 11:17 AM
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Nicely put Joel.
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Old Feb 11, 2012, 12:12 PM
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United States, MA, Rutland
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Here's my thoughts:
The real carbon cub POH: http://www.cubcrafters.com/pdfs/ccss/cc11-160afm.pdf

Performance specs:
Stall Speed (full flaps) ........................................ 32 mph
Stall Speed (no flaps) ........................................ 40 mph

All things equal, which they're probably not, that is a 20% decrease in slow speed envelope. So lets say the UMX CC lands at 10mph, full flaps it will do the same at 8mph...

Regardless, I can't wait to play!
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Old Feb 11, 2012, 07:29 PM
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Hmm... No spins on the full scale version! VNE 141 mph.

180 HP takeoff power, but 80 HP max after five minutes at full throttle, assuming you don't exceed 2700 rpm.

I think Powerball is up to 325 million. I'll have to check my ticket in the morning.

With 180 HP on tap and 32 mph stall with full flaps I could probably land and take off at my club field. If I won the lottery I could also buy a full sized ASK-21 and get my friend Jimmy checked out as a tow pilot, then paint both planes to match the HH models, warping the meaning of scale model a bit.

Ho hum. It'll never happen.

Pete
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Old Feb 12, 2012, 01:08 AM
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So if there's no servo for the aerotow function, does anyone know how you're supposed to release the plane you're towing?
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Old Feb 12, 2012, 01:28 AM
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Joined Jul 2002
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I'm thinking the glider must release the line.

Yep, here it is from the eflite website.

"Like a giant-scale sailplane, the UMX ASK-21 is equipped with remote tow hook release control making it aerotow capable when paired with a powerful RC airplane like the E-flite UMX Carbon Cub SS (EFLU1180)."
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Old Feb 12, 2012, 01:32 AM
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Quote:
Originally Posted by Spitfire22 View Post
So if there's no servo for the aerotow function, does anyone know how you're supposed to release the plane you're towing?
The ASK-21 has a servo-operated tow-release. The glider pilot releases the towline, and it then trails behind the Cub.

Joel
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Old Feb 12, 2012, 02:13 AM
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United States, IA, Grinnell
Joined Aug 2007
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Quote:
Originally Posted by turboparker View Post
The ASK-21 has a servo-operated tow-release. The glider pilot releases the towline, and it then trails behind the Cub.

Joel
So the Cub can't release the tow line?
Isn't that going to effect the Cub landing?
Ron
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