| Title: | Welcome To The Radio Control Conference |
| Notice: | dir's in 11, who's who in 4, sales in 6, auctions 19 |
| Moderator: | VMSSG::FRIEDRICHS |
| Created: | Tue Jan 13 1987 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1706 |
| Total number of notes: | 27193 |
JOHN, TOM OR ANYONE ELSE,
MY FRIEND AND I WERE OUT TEST FLYING HIS NEW F1 ON SUNDAY. IT HAD
VERY STRANGE FLYING CHARACTERISTICS. I WILL TRY TO DESCRIBE.
. IN TURN ONE IT WOULD JUMP UP HALF WAY THROUGH.
. IN TURN ONE IT WOULD GO FOR THE GROUND HALF WAY THROUGH.
. ON A TIGHT TURN THE ELEVATOR WOULD SEEM TO COME IN LIKE YOU
WERE PULLING IT TIGHTER TOWARD THE END OF THE TURN.
SEEMED TO DO DIFFERENT THINGS AT DIFFERENT TIMES. PROBABLY
DO TO VARING SPEEDS. WAS ALSO HIS FIRST FLIGHTS USING IN FLIGHT
MIXTURE. ( HE'S TAKING OUT THE INFLIGHT. THATS ANOTHER CHALLENGE.)
I THOUGHT HIS PROBLEM MIGHT BE HIS RODS BENDING IN THE TURNS.
WHEN WE GOT HOME WE NOTICES THAT HIS RIGHT ELEVATOR WAS SLIGHTLY
LOOSE. THE METAL TORK ROD HAD COME LOOSE INSIDE THE ELEVATOR. IN
ADDITION THE ELEVATORS WEREN'T LINED UP JUST RIGHT. THE RIGHT ONE
WAS SLIGHTLY LOWER. THE PLANE BALANCED PERFECTLY @ 2 3/8".
I'VE PROBABLY ANSWERED MY OWN QUESTION BUT ANY ADDITIONAL INPUT
ON ROD FLEXING AND WHAT EFFECT BAD ELEVATOR BUILDING HAS ON A
SHIP WOULD BE APPR.
P.S. IF YOU READ THIS JOHN... JUST FINISHED A NEW WING USING YOUR
TECHNIQUES WITH THE EXCECTION OF 3/32 RATHER THAN 1/16. I LET YOU
KNOW HOW IT FLIES THIS WEEKEND.....
BOB
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 285.1 | SPKALI::THOMAS | Wed Apr 08 1987 08:06 | 29 | ||
Hummmmmmmmmmmmmmmmmmmmmmmmmmmm, The increase in effectiveness or
precieved increase is possibly due to rod flex as you thought.
Realize that it wouldn't take much. Are all hinge lines sealed?
I assume we are talking of a racer. I would go with a split elev.
rod if your plane has a split elevator. I worry about a dowl or
one of those metal rods being used in a sport ship let alone a
racer.
The pitching is interesting. Different throw on elevator halves
will cause a rolling type effect much like an aileron. If the
ship is slowing down in the turns I would go for a check of the
engine thrust line settings. When a plane is under power a thrust
setting that is off may not show up. It is when the plane slows
that the engine thrust line setup shows up. I would think that if
this is the problem you may need to add a little right thrust.
You need to fix that elevator, seal the hinge lines on all surfaces
and then spend a couple hours in the shop checking out ALL alignments.
I mean up/down deflections,wing/hor. stab at right angles to thrust
line. Thrust settings. If your ship has a fiberglass fuse check
for twisting. Use an incedence meter and check the settings of the
wing and stab at center cord, middle and on the wing tip.
Tom
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| 285.2 | RIPPER::CHADD | Go Fast; Turn Left | Wed Apr 08 1987 23:46 | 38 | |
Hi Bob,
Ye of little faith. Why dust thou use 3/32 balsa when 1/16 will do. May your
model be cursed with extra weight and never beat an Australian. !!!!!!!
I have experienced similar problems with FAI Racers. The problems have been
caused by the following.
1. Bad servo on the elevator being slow to react or non linear.
2. Badly packed RX; antenna positioning, cable positioning etc..
... Repack the radio more loosely.
3. Flexing/twisting of the Stab.
4. Loose elevator like you have found.
You say you have set up the CG to 2 3/8", try this system if you are brave. Set
up the CG to the plan and trim the model. Watch the performance in straight an
level flight it should be stable. Next move the CG back 1/8" and try again. The
idea is to keep desensitizing the elevator and moving the CG back until in
straight and level flight the model tends to bump up and down slightly, move the
CG forward the last increment to eliminate the problem. At this point you
require the minimum elevator movement to make a turn and generate the least
drag with the elevator and go a little faster.
< I assume we are talking of a racer. I would go with a split elev.
< rod if your plane has a split elevator. I worry about a dowl or
< one of those metal rods being used in a sport ship let alone a
< racer.
Tom, I use 3/32" wire to join the elevators and silver solder the control horn
to the wire. The length of the wire is very short and it does not seem to be a
problem. For my control rods I use the Dubro flexibles (the yellow and blue
ones) again they are very short, I find I have minimal slack in the control
surface.
John
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| 285.3 | Misc | KAY::FISHER | Stop and smell the balsa. | Thu Oct 11 1990 15:38 | 27 |
If these Futaba upgrades are such good deals why doesn't anybody want to buy my Futaba Radios? I did say Best Offer - dead silence. I was in the shop last night getting them together to take to the CRMCM auction next Wednesday. I expect to offer all with no min bid. Well maybe $100 min on my JR single stick. As long as I'm covering multiple topics here (poor moderator) let me add that I believe I finally found the cause of my Aeromaster crash as I removed the servos from the fuselage last night. One EZ connector was not connected to a servo arm. The Elevator. I guess I missed this in post crash investigation because all servos worked and it looked like the arm was broken off the elevator servo (crash damage). But last night I noticed that the EZ connector did not have any evidence of the remains of the elevator servo arm attached. Al has been telling us all along that they weren't that safe - especially for larger or faster planes. Another Al Casey safety rule that I was not adhering to is inspections. I very seldom removed the bottom wing from the Aeromaster. Never removed the top wing. I don't want to retrofit anything but I do have a lot of EZ connectors in place! Makes you appreciate Z-bends. Bye --+-- Kay R. Fisher | ---------------O--------------- ################################################################################ | |||||