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Old Jan 16, 2012, 01:10 PM
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Mini-HowTo
BlitzRCworks F4U (200 class) improvements

Bought a "BlitzRCworks" (Art-Tech 200 class) F4U Corsair before Xmas.

Art-Tech 200 class F4U link
http://www.art-tech.cn/english/Artic...?ArticleID=340

Kyosho aiRium (similar plane different equipment but still heavy)
http://www.kyosho.com/eng/products/r...duct_id=108164

I knew it was heavy but I did one successful maiden flight without wheels.
Did not feel confortable with it's performance so I decided to modify.

Replaced the powerful (and heavy 30g) brushless motor with a 18g
~60-70W motor. Replaced also the 10A ESC (21g) with a 6A (6g)
ESC. To get the CG forward I moved aileron servo to forward of CG.
I also move RX (removed case to save weight) forward.
Replaced the 3 blade prop 7x5 with a 2 blade 8x4.

Test flight this weekend showed very sensitive to elevator input.
Moved pushrod from 3rd hole to first hole (inner most) on servo.
In the other end the outer most hole to minimize movement.
It worked the plane is now (without wheels) AUW 241g. It's
a delight to fly now both without wheels and with wheels.

Landing gear is not realy recomended it snaps of easily, the plastic
reinforcement in the wing snapped out at first landing ...

Forgot to mention that it went vertical (a bit overpowered even with a 6A)

Note that the replaced Art-Tech brushless motor worked just as good as the
Kyosho AF400 but slightly heavier +4g. The reason for replacement is weight
it's simply the wrong motor and ESC for such a small plane.

Also the servos could have been much smaller: Rudder servo a tiny 3-4g servo
would do. Probably the same for the elevator. This requres low friction/less
stiff hinges.
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Last edited by FLOEY; Feb 01, 2012 at 10:01 AM. Reason: Added info some typos
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Old Jan 18, 2012, 02:42 AM
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More 200 class F4U tips / how to.

Landing gear brackets: Needs to be modified if used.

The bracket needs more surface against the foam of this quality.
It's not the glue who breaks but the foam is actually ripped out.

I will try to find a solution ...
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Old Jan 22, 2012, 08:17 AM
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Finaly managed to get the photos of my modifiactions

After the modification I had to do a major repair after a hard landing (wind).
The fuselage cracked in two. I glued it together again with polyuretan
glue (similar to Gorilla glue, water cure) called Cascol D4.

Test flight after repairs showed no detectable difference in flight
performance.

Have had no time to look into the landing gear problem. Got some
ideas but it have to be investigate what is actually is required to
keep it in place for more than one landing.
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Old Feb 11, 2012, 09:02 AM
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Improved landing gear bracket

Update: Before you decide to do this improvement read the test/experience ... post ...

Now I've finaly had time to improve the landing gear bracket
attachment.

How I did it.

1. Cut a slot with a knife see photo "Reinforcement"

2. Pressed a piece of lite ply about 20x75mm into the slot
with glue on.

3. Secured the lite ply and let the glue dry/cure/expand.

4. Cut off the remaining lite ply

5. Glued and secured the plastic bracket with 2 wood screws.
Added the landing gear and one more wood screw as lock
See photo "Landing gear bracket"

I've not tested the solution yet. Will com back with the result.
Too much/unstable wind to fly today for test flights
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Last edited by FLOEY; Feb 26, 2012 at 08:21 AM.
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Old Feb 13, 2012, 06:04 AM
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Test of F4U improved landing gear

The weather was perfect Yesterday for test flights of my F4U with
reinforced landing gear brackets (ref. photos previous post)

1. Test ("Normal" landing):

Take off and landing on frozen sport stadium Artificial turf.
No problem even if the landing was a bit harder than normal.
(bounced a bit ...)

2. Test ("Hard" landing):
Take off and landing on Snow with thin ice crust. Take of no
problem. The actual landing was smooth but the wheels crushed
the thin ice and the plane went nose over. Examined the landing
gear no damage.

3. Test (Extreme hard)
Same surface as above but this time the landing was hard
almost a crash (pilot error). This time one landing gear leg
was bent the other bracket was ripped partially loose. Easy
repair, no problem.

Conclusion this reinforced landing gear is definitely a improvement.
A must if You want to fly this F4U with fixed landing gear on various
grounds like gravel, tarmac or short gras.

Negative: The AUW went up to 264g such that the plane is not as agile
as the 230g. So if You want a agile omptimal warbird forget the landing gear
and do belly landings.

Positive: I think this F4U is the ideal WW2 warbird in this size for a fixed
landing gear with it's thick strong wings.

My Sptifire Me.109 and P-40 wings would not be able to take that much strain.
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Old Feb 26, 2012, 08:43 AM
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Landing gear removed!

After the strength test repair I did some flight test and touch and go landings
this weekend. After a few landings the right landing gear was bent again.
Bent it back and flew and landed a couple of times same occure.

I also felt that the performance of my F4U wasn't pleasant.

The choice was now either improve the landing gear again, by
replacing the obviously too soft wire used or give up and remove it.

I decided to remove it. Strugled a bit to remove it, obviously
my improvements was solid ... got them removed finaly.

New test flight without landing gear. The F4U had a AUW of 245g
it flew extremely well. Performance was back, flying with landing
gear was like flying with flaps lowered. So the landing gear weight
11g was not crucial it's the increased drag that made most impact
on the plane.

My advice for the F4U: Forget the landing gear it's simply not
worth the hassle. To get it working You got to do a lot of improvements
and the result will most likely be lack of performance ...

To reduce the drag a retractable landing gear (more hassle and weight)
may be an option but I doubt it.
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Old Feb 26, 2012, 08:48 AM
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Cockpit hatch flew off.

I've been sceptic to use magnets for cockpit hatches before I'm now
convinced that is'n the solution. I replaced the magnets with Velcro
(hook-and-loop fastener) http://en.wikipedia.org/wiki/Velcro
on my F4U.

It's light and much better than magnets
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Old Apr 22, 2012, 06:17 AM
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Art-Tech 200 class F4U video

Not the best video ... In my view this shows a lot more potent plane than
the original with it's non scale 3 blade 7"x5" prop
Modified Art Tech 200 class F4U Corsair (1 min 37 sec)
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