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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/4/2009 4:08 AM   
GaGeeBees



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ORIGINAL: RHarding

Re: 1.70 radial. Are you having any problems keeping the lower left cyl. firing?

Richard


No. Using McDaniel/SonicTronics onboard glow driver set to come on at about 1/4 throttle. It's also critical to get the low speed needle dialed in once break-in is completed.

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/17/2009 4:45 AM   
MormonMike


 

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Status: offline 		Well Guys, I need some help.  This is very difficult to take-off and land.  Fly's great once in the air but, very squirrly and erratic on take off, landing roll out see's this zig-zagging all over the runway and usually a nose-over when it's just about stopped and veer's sharply.  What is the problem ?.  Has the stock tailwheel set-up, plenty of space between the tires and inside edge of pants. Simply wont hold straight on take-off roll.  Would a Piezo gyro on the rudder servo correct this ?.  Beautiful plane but unless this can be corrected, It'll be going " By-By " to the junk shelf.  I have only about 75 percent throw on the rudder but I wonder if a different tail-wheel unit would help. Springs are also quite tense and responed well with rudder input .   I've had this a year but only six flights with it because it is'nt any fun.  P.S. , it;s clean with no damage.............yet.   Please help.  MM

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/17/2009 5:00 AM   
GaGeeBees



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Status: offline 		It sounds like you've got a wheel that won't turn freely.  I've found that I prefer to have my rudder on low rates for the takeoff run.  It's very easy to overcontrol if I don't.  I do not have any problem on landing and enjoy doing touch-n-go's down the length of the runway.  It tracks straight and true.  My setup is totally box stock except for the main wheels.  I replaced the foamies with some low bounce rubber wheels.

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/17/2009 5:14 AM   
MormonMike


 

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Status: offline 		Yes, the mains are low-bounce foamies and they both turn freely, no binding on them and they wont rub against the inside of the pants, plenty of clearence.   I'm not a beginner with this stuff,  but,  I'm stumped at this point.  I'm still leaning towards a differrent tail wheel set-up or a GWS type gyro  [ if I can find a dealer with one in stock ] Thanks for the reply, MM

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/17/2009 5:42 AM   
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Status: offline 		Let us know how it works with the gyro.  Good luck.

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/17/2009 5:58 AM   
TooLow



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Status: offline 		MM-I started to have that weaving problem after over 200 flights and found out that I smacked it down too hard!  Discovered that I got too much toe-in with the "smack-down"bent the axles back to a minimal toe-in and problem was solved.  Worth a look!!

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/17/2009 6:04 AM   
jrf


 

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Status: offline 		Have you checked the wheel alignment.  The wheels should be toed-out 0-1 degree.  Never toed-in.  They come set at zero, but a rough landing can bend them.

What do you mean when you say 75% on the rudder throw?  Can you measure the throw in inches?  The manual calls for 1 inch each way on low rates, measured at the widest part of the rudder.  If you have more than that, you are almost guaranteed to get into a PIO (Pilot Induced Oscillation) situation.

Pick a day when the wind is straight down the runway and try landing without touching the rudder.  If that works, your problem is over-controlling the rudder.

On takeoff, you must accelerate slowly.  That will minimize torque and P-factor effects and you should only require a small and constant amount of right rudder to keep it straight.  Advancing the throttle all at once will definitely start the zig-zags.

Jim




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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/17/2009 3:43 PM   
sedrick


 

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Status: offline 		there have been discussions of toe-in toe-out before.  Toe in for the wheels will minimize the tendency to turn.  As the plane turns the inside wheel tends to roll straight ahead and has reduced resistance to rolling thereby staraightening the roll.

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/17/2009 7:48 PM   
MormonMike


 

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Status: offline 		Possibility it could be too sensitive on the rudder.  The rudder has about three inches of throw. About 75% for both high and low rates.  Using any rudder in flight will snap this one over on its' back into a tail spin. Less than that throw amount and the plane needs the whole width of the runway  to turn around. It needs a lot of rudder throw to turn the tail wheel enough to steer it.  Maybe stronger coiled springs in place of the originals ?.  All my landings are very soft with this plane, it's the roll out that are uncontrollable.  There appears to be no toe-in or out. on the mains.   It handles a lot like a Piper Cub.  Gyros are difficult to obtain. Majority are for Helo's.   Can you guys offer a source to find one somewheres that's in stock ?.     By-the-way,  This plane flys beautiful with a Saito 1.50 and as I said earlier, it's excellent in the air.   Thanks fellas, MM

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/17/2009 8:23 PM   
jrf


 

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Status: offline 		Sedrick: 

Your analysis is correct for the front wheels of cars and the main wheels of tricycle airplanes. 

But that self steering tendency is not desirable for tail-draggers, particularly high-wing tail-draggers.  When an airplane turns on the ground, the long wings and the high center of gravity make the wings lean to the outside of the turn, loading the outside main wheel, which becomes the "steering " wheel.  If that wheel is toed in, it will make the turn sharper, lean the wing more, load the wheel more and make the turn even sharper, which will lean the wing more, load the wheel more and ....  you get the idea.  The result is an unstable condition which frequently results in a ground loop. 

0-1 degree of toe-out is just enough to make sure that there is never an attitude or gear flex condition which would result in toe-in.

Jim

< Message edited by jrf -- 5/17/2009 9:22 PM >

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/17/2009 8:57 PM   
jrf


 

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Status: offline 		Mike:

I copied this from the Assembly Manual, which is on the Pacific Aeromodel website.  I guess they should have said that too much rudder will make the airplane uncontrollable on the ground also.

I had the same problem turning the airplane around on the runway with low rate rudder.  My solution is to use the recommended high rate for slow speed taxiing and the recommended low rate for everything else.

For the tailwheel, you need to preload the springs when you install them.  Bend the ends so that the spring is about a half inch or so shorter than the distance between the steering arms so that you have to stretch it to install it.  A longer steering arm on the bottom of the rudder will also help.

A gyro won't hurt, but basically you just need to cut down on your rudder throw. 

Jim

SETTING UP THE CONTROLS

Ailerons                      7/8”                          1 1/8” up
                                1/2”                             5/8” down

Elevators                  1 1/8"                           1 3/8" each way
 
Rudder                           1”                           1 1/2” each way

Do not omit the aileron differential. The Monocoupe will not fly well without it.

We recommend Exponential on the elevators: 25% at low rate and 40% at high rate.  We do not use Expo on any of the other controls. CAUTION: The rudder is extremely effective. Do not use more than the recommended travel on the rudder.  High rudder deflections can make the airplane uncontrollable in the air.

< Message edited by jrf -- 5/17/2009 9:08 PM >

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/18/2009 1:32 AM   
MormonMike


 

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Status: offline 		Jim, Thank you !!.    OK, I'll try that on the recommended throw.  I'm still going to pursue a gyro though.  It'll  be a couple weeks, I'm off to California.  Thanks guys.  MM

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/21/2009 3:59 AM   
GBR2


 

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Status: offline 		I setup Flight modes in my 9303 and in the one I use for taxiing and starting, I set the rudder to travel as far as it will go without hitting the elevators.  No problem with taxiing on the ground after doing this.

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/22/2009 7:50 AM   
thetireman1


 

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rcar4,

Had the same issue with mine needing covering to patch the area in front of the rudder. The guy at PAC acted as though it was the first he had heard of it. Reluctantly, he sent me some scrap covering to patch the area. Took about a month. I am not impressed with this level of customer service, particularly on a premium-priced ARF. The plane also had damage to the bottom of the fuselage that I discovered when I took it out of the box. I requested a replacement but was refused.

Nice plane, but I cannot reccomend dealing with them.

Guys,

   The covering is Ultrcote on the plane and is easliy matched at your LHS as I did. No need to wait weeks for them to send you a piece of covering!



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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/23/2009 4:48 AM   
RAMFlyer



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Status: offline 		Gotta say that their lack of customer service to correct their problems (poor covering, poor shipping packaging) keeps me from buying...

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/23/2009 7:21 AM   
GaGeeBees



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ORIGINAL: RAMFlyer

Gotta say that their lack of customer service to correct their problems (poor covering, poor shipping packaging) keeps me from buying...


That hasn't been my experience with either of the two Pacific Aeromodels ARFs I've purchased.  Both have been excellent and their service has also been terrific.  I have their Gee Bee Y and the Monocoupe and they're two of the best flyers in my hangar and that's more than a few planes.  You're passing on some outstanding planes.

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/23/2009 7:47 AM   
Ed


 

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 " I have their Gee Bee Y and the Monocoupe and they're two of the best flyers in my hangar "

What kind of covering are they using on their Gee Bee Y  ?   And is it the same as their Monocoupe  ?



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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/23/2009 1:36 PM   
GaGeeBees



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ORIGINAL: Ed

 " I have their Gee Bee Y and the Monocoupe and they're two of the best flyers in my hangar "

What kind of covering are they using on their Gee Bee Y  ?   And is it the same as their Monocoupe  ?



You know, I don't have any idea.  I've never had to do a repair on the covering.  I suspect it's Ultracote on this one as well but can't say with certainty.

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/28/2009 7:17 AM   
Ed


 

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ORIGINAL: MormonMike

Well Guys, I need some help.  This is very difficult to take-off and land.  Fly's great once in the air but, very squirrly and erratic on take off, landing roll out see's this zig-zagging all over the runway and usually a nose-over when it's just about stopped and veer's sharply.  What is the problem ?.  Has the stock tailwheel set-up, plenty of space between the tires and inside edge of pants. Simply wont hold straight on take-off roll.  Would a Piezo gyro on the rudder servo correct this ?.  Beautiful plane but unless this can be corrected, It'll be going " By-By " to the junk shelf.  I have only about 75 percent throw on the rudder but I wonder if a different tail-wheel unit would help. Springs are also quite tense and responed well with rudder input .   I've had this a year but only six flights with it because it is'nt any fun.  P.S. , it;s clean with no damage.............yet.   Please help.  MM


I have tried rudder throws from 1/2'"  to  2" , and this is still one bear of an aircraft on the ground !
My touch & go's, and landings are fine, but take-off's are wild and crazy ! 

Let me know if you come up with a good gyro / servo combination  ?
Or better yet  ................  a simple fix to straighten out the take-off's. 

Thanx.

Ed





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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/28/2009 8:41 AM   
Jim T


 

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quote:

ORIGINAL: Ed


quote:

ORIGINAL: MormonMike

Well Guys, I need some help.  This is very difficult to take-off and land.  Fly's great once in the air but, very squirrly and erratic on take off, landing roll out see's this zig-zagging all over the runway and usually a nose-over when it's just about stopped and veer's sharply.  What is the problem ?.  Has the stock tailwheel set-up, plenty of space between the tires and inside edge of pants. Simply wont hold straight on take-off roll.  Would a Piezo gyro on the rudder servo correct this ?.  Beautiful plane but unless this can be corrected, It'll be going " By-By " to the junk shelf.  I have only about 75 percent throw on the rudder but I wonder if a different tail-wheel unit would help. Springs are also quite tense and responed well with rudder input .   I've had this a year but only six flights with it because it is'nt any fun.  P.S. , it;s clean with no damage.............yet.   Please help.  MM


I have tried rudder throws from 1/2'"  to  2" , and this is still one bear of an aircraft on the ground !
My touch & go's, and landings are fine, but take-off's are wild and crazy ! 

Let me know if you come up with a good gyro / servo combination  ?
Or better yet  ................  a simple fix to straighten out the take-off's. 

Thanx.

Ed






Just curious.  Are you running any expo in the xmtr programming?

Jim

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/28/2009 4:50 PM   
thetireman1


 

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Status: offline 		There are folks who have used gyros with much success on this plane. Haven't heard of many commenting on its ground handling.

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/28/2009 8:13 PM   
GBR2


 

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Status: offline 		I use the recommended low rates when taking off and have had no problems with it being squirrely during take off.  Perhaps people are jamming the throttle to full blast to quickly.  The plane does require some speed for the rudder to become effective but once the tail lifts it only requires a gentle touch on the rudder.  While Pacific doesn't recommend expo on the rudder, it doesn't mean that you can't use it.  As the rudder is very effective once speed is reached, expo might help to not overcontrol with the rudder.

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/29/2009 4:35 AM   
MormonMike


 

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Status: offline 		Hello Ed,   Here's where I'm at right now.   I did away with the springs and installed pushrod instead.  The Rudder swings only an inch left or right as per instructions.  Also,  I will still install a Futaba 190  gyro.  I have done the pushrod install on two other squirrly planes as well with much better results.  Seagull's Spacewalker 2 is an example. and handles much better but a gyro will still be installed.   Took a while to find the right gyro but  it should do the job.   $50 bucks is'nt bad for the cost too.  It'll be a week or so till it arrives. "till then. MM

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 5/29/2009 6:45 AM   
Ed


 

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Status: offline 		" Took a while to find the right gyro but  it should do the job.   $50 bucks is'nt bad for the cost too.  It'll be a week or so till it arrives. "till then. MM  "

Thanks for the update Mike.  I have also replaced those wimpy springs with a push rod, however, she's still a bear on the ground. 
Ed






< Message edited by Ed -- 6/3/2009 6:24 AM >

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RE: New Pacific Aeromodel Clip Wing Monocoupe - 6/3/2009 6:22 AM   
Ed


 

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Status: offline 		The little beast has been tamed !   No gyro needed.   Take off rolls are now straight as an arrow !

Before I give you the Ultimate Solution, take a careful look at the following two photos, and tell me what you see that is different   ?  Can you see it  ?

Ed


Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


< Message edited by Ed -- 6/3/2009 6:29 AM >

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