RE: CMPro Lancair
 

Yeah and that's - IF - you can get the LA up to that RPM.

I put the LA .46 into a Megatech .30 Extra 330s with a 10x7 prop this plane screams, but it is considerably smaller and lighter than the Laincair.

I doubt the LA .46 actually puts out more than 1.0 BHP.


The .46 AX on the other hand does quite well.

RE: CMPro Lancair
 

Well i ran the .46 LA engine on an engine stand before mounting it to the plane to tune it. and it seemed to run real good and put out alot of power on the bench. maybe in the air will be different. IT was cheap and convient at the time. I could always run a higher nitro content to get more power.

the tank fits fine in the plane with the throttle cable were its located i can see how you put foam and a piece of wood to hold it. I'm suprised it doesnt vibrate loose. Thanks for the pic of the tank mounting Calixto and the tip on how to get the thrust angle correct appriciate it.:)

RE: CMPro Lancair
 

I feel confident that the .46LA will pull it in a scale like manner, mine goes out of sight on a vertical climb with the AX which is .45 hp more
powerful, just be careful and keep it flying fast, and in landings don`t let it slow down too much. Don`t give it more than 9mm throw in each direction on the elevator because it will snap on full elevator, also try to fly it out of a paved runway so it can pick up speed fast, otherwise it flies beautifully and tracks like a train.
Good luck and enjoy it.
Calixto

RE: CMPro Lancair
 

Is anybody checking this plane with an incidence meter? To check for wash-in, or the angle of thrust / wing / stab, etc. Or is the airfoil just not tolerant of high angle of attack...

RE: CMPro Lancair
 

I doubt you will be satisfied with this engine in this plane.

Remember it is much like putting in a .32 engine in the Lancair.

You'll find it underpowered.

The upside is that the Lancair has a fairly sleek profile, so once it's flying, it doesn't take a lot of power to keep it at speed.

I would suggest that you opt for thrust versus pitch on your prop selection, as the engine should unload quite a bit in the air.


BTW: Higher nitro content does NOT do anything to improve engine power. Higher nitro content helps to smooth out idling and tuning tolerance.

RE: CMPro Lancair
 

It has a tapered wing with a thin simetric airfoil and a fairly high wing loading.

RE: CMPro Lancair
 

Have you flown your Lancair yet? please post a report on the first flight, I am curious on how will the LA angine will pull it.

RE: CMPro Lancair
 

Nope havent flown it yet ran into some Financial issues and it has been put on hold for a time. Have to still get fuel line and a spinner for it. guess i should also get a fuel port for the third line on the fuel tank, but havent mounted the fuel tank yet. Having some difficulty with the blind nuts that mount the wing on, kinda frustrating. i think i have one that is set the other one still having a little issues lining it up and they dont give you much wood in the fuselage for the nuts to bite into.
But i will slowly get it there. i was hoping to get it airworhty before it got cold, but it doesnt look like that is going to happen.[&o]
So may be awhile before i get to fly it.
i'm wondering if anyone else has had problems with there engine cowling fitting correctly i notched it for the muffler and the high speed needle still have to make a hole for the glow plug.

I'll have to take pictures of were i'm at currently with the plane.

Link

RE: CMPro Lancair
 

Well heres some pics of how she sits at the moment. still have a little more to do to it before she is flyable. want to make sure i get the cg correct and throws on the elevator Ect. Looks like its gonna be a little bit of a winter project. Wheather has turned bad here raining and the flight field is muddy and nasty went and checked it out today. still have some parts and supplies to get for it .

Could rob stuff from my other planes but that just wouldnt be right and it can wait a little longer. I will have to tune the engine again cant fit the cowl on without removing the high speed needle completely. I'm hoping the mistake on the rudder doesn't have a large effect to the planes flight charteristics. Never used the plastic slide in hinges that use super glue before and was in a hurry to much i think. It may be visable in the pics.

Seems that not to many people are intrested in this plane or its not very popular for some reason, very strange considering its a great looking plane. And it hasnt beeen to difficult to assemble so far i mean i'm not an expert builder buy any means and have managed to get this far without to much trouble.

Been flying the twist 40 to get more experience with low wing airplanes and flying my extra 330L but both are a completely different desighn then the lancair. But i will post my result of the maiden when i get to that point. I'm hoping i will have Someone to video tape it. Since it will be its first flight and may be its last would be nice to have it on video. Have to see how that goes.

But it looks like a Lancair didnt put the cowlings on the landing gear cause the runnway i ususally use is a dirt road out side of town. :eek:

RE: CMPro Lancair
 

Well it is finally Done Yea I started and ran it have to just check CG wondering if anyone else has had issues with the way the wing is mounted on there Lancair mine has 2 bolts that go through the wing. I have one holding it and need to figure out something with the other one. Has anyone else made modifications to the way the wing bolts on? If so some pics of the moddified mounting would be nice to see i dont like the way the wing mounts.

That the bolt issue and the cg and making sure my flight surfaces are correct and i'm ready to take it up in the air. and the .46 LA seems to have plenty of pulling power. on the ground when i ran it up. Just need a nice day to go and maiden it.:)

RE: CMPro Lancair
 

Only thing I did was use 1/4-20 nylon screws in place of the stock ones. Added some extra wood and tapped it, put some thin CA in the holes and you're good to go.

RE: CMPro Lancair
 

Did the same as linkadrip, and it works fine.

RE: CMPro Lancair
 

[quote][/quote
HET LINKADRIP HAVE YOU DONE YOUR MAIDEN YET.
LOOKING TO MAIDEN MINE THIS WEEKEND. A BIT NERVOUS AFTER ALL THE STORIES OF TIP STALLS AN THE LIKE.
RUNNING A 55 2 STROKE. GOT THE C.G. AT 72 MM, GOOD TO GO A GUESS

RE: CMPro Lancair
 

[quote]ORIGINAL: ALO 111


Good luck on your maiden. From everything I have read to date I believe that most flight control problems were induced by excessive flight control surface movement. If your control surfaces are programmed as to the manual you should have nothing but fun on your maiden. I am waiting for our new field burmuda grass to grow so that I can get mine in the air. Our present field would require me to add much larger wheels and get rid of the wheel pants and they are simply too good looking for that. I presently fly the new GP RV-4 with 3 1/2 " wheels and they work but others have some real problems.

Take some pictures and let us know how it goes. It is raining here in central Florida so no flying today.

Howard

RE: CMPro Lancair
 

Yes i maidened my plane yesterday it was a nice sunny day no wind out. Make sure you have the flight control surfaces correct and your CG you say is correct. my elevator was a little high i think the plane is very fast took alot of runway for mine to get up. But once it did get off the ground it was like a bullet. the O.S. .40LA engine screams with an apc 11X6 prop and the plane must fly over 80 mph. and landing was an extreme event.

Without a head wind and the air being dead calm this plane didnt bleed off speed like i thought it might, the use of flaperons would have possably helped it which i'm considering programing into it, before flying it again. But coming in was hot real fast . And there was no tip stalls but i came in real fast and that was scary.

I didnt do any loops or rolls or aerobatic manuvers just pattern flew it. Very responsive plane to the slightest movements of any kind a real Ferrari in the air this is the fastest plane i have ever owned.

So be prepared for that its almost like flying a jet has alot of the same charteristics in my opion. Mine doesnt have the wheel cowlings on it cause i take off from a dirt road and land on the same dirt road. But with the wheel Cowlings on they may tame it down buy giving it some drag under the plane when it's flying.

Whitout The wheel cowlings when its flying you can't even see the landing gear or at least i couldnt.

with a 55 2 stroke the plane will scream just dont go full speed then try to do a roll or loop you may tear the wings off it lol:D

RE: CMPro Lancair
 

WELL I GOT A CHANCE JUST BEFORE SUNDOWN YESTERDAY FOR A MAIDEN ON THE LANCAIR.
EXCUSE MY MISTAKE ON A PREVIOUS POST I SAID I HAD A 55 IN HER, I ACTUALLY HAVE A VMAX 46 IN THE PLANE. GUESS IAM GETTING OLD OR I HAVE TO MANY PLANES OR SOMETHING.
WELL THE SUN WAS SETTING FAST AND I HAD TO WAIT TILL LATE BEFORE THE WIND FINALLY DIED.
TAKE OFF RUN WAS LONGER THAN I EXPECTED,IT NEEDS A LOT OF SPEED BEFORE IT LIFTS OFF.
I GOT SOME ALTITUDE AND MADE A SLOW NERVOUS TURN, JUST TWO PASSES AND I HAD HER TRIMMED OUT JUST A BIT OF DOWN ELEVATOR.
I AM GLAD FOR ALL THE ADVISE I HAVE FOUND ON THIS SITE IF YOU GET THE CG WRONG YOU WILL HAVE LOTS OF TROUBLE(72MM)
ELEVATORS NEED LOTS OF EXPO AND VERY SMALL MOVEMENT.
I AM NOT THAT HAPPY WITH THE POWER BUT I AM SPOILT WITH OVERPOWERED STUNT PLANES.
SHE FLIES FAST ENOUGH I GUESS AND DOES A SUPER FAST SNAP ROLL. TRIED SOME LOOPS , VERY SCALE LIKE.
TRACKS WELL AT SPEED BUT WILL LOSE ALTITUDE FAST IF YOU BANK HARD WITH LESS THAN PLENTY SPEED.
DID A PRACTICE RUN ON THE LANDING APPROACH AND VERY APPARENT WAS THAT THIS WAS GOING TO BE FAST.
TOOK A DEEP BREATH AND WENT FOR IT , SHE LANDS FAST BUT SMOOTH I WOULD NOT LIKE TO LAND HER WHEN THERE IS A LOT OF TURBULANCE. PUT HER DOWN WITH OUT A BOUNCE.AND WATCHED THE UNDERCART WORKING HARD ON THE GRASS. SHE ROLLED TO A STOP AND A HAD THE STUPID RELIEVED SMILE THAT WE HAVE WHEN A PLANE COMES BACK IN ONE PIECE AFTER A MAIDEN.
ON INSPECTION I FOUND THE NOSE STRUT HAD ALREADY BENT AS EXPECTED, SO I WILL TRY AND FIT SOMETHING FIRMER.
THIS IS A DIFFERENT PLANE TO ANTHING ELSE I OWN,HAS STONG SCALE LIKE TENDENCIES. ITS NOT A PLANE FOR BEGINNERS THATS FOR SURE,IT WILL BITE IF NOT TREATED RIGHT BUT I WILL ALWAYS BE A THRILL TO FLY.
I AM SURE WHEN I GET MORE CONFIDENT WITH IT ITS GOING TO A LOT OF FUN.
SPINNING A M.A 11/6 AT THE MOMENT WILL TRY SOME OTHERS AS WELL.

RE: CMPro Lancair
 

FOR THOSE INTERESTED I FLEW THE LANCAIR AGAIN THIS WEEKEND BUT TRIED A 10/6 PROP.
DUE TO THE LONG GRASS AND WHEEL PANTS I USED A LOT OF RUNWAY AND WHEN I LIFTED HER STILL HAD SOME WICKED TIP STALLING. ALMOST LAST IT BUT MANAGED TO BE ALLTITUDE.
THE PLANE NEEDS MORE POWER TO GET THE AIRSPEED NEEDED, THE 46 VMAX IS JUST NOT DOING IT.
I HAVE ORDERED A 55 AND I THINK IT WILL BE A HOOT.
ANYONE WITH THIS OR BIGGER FITTED?

RE: CMPro Lancair
 

WELL FELLOW LANCAIR OWNERS I RECIEVED AN NEW OS 55 AX TODAY AND ITS GOING STRAIGHT INTO THE LITTLE LANCAIR.
AND NOW FOR SOMETHING REALLY DIFFERENT!!!!

RE: CMPro Lancair
 

when you get the 55 in there post some pics i would like to see how it fits the o.s. .46 i have in mine just bearly fitts in the cowl wondering how a bigger engine is going to fit in that cowling.:)

Link

RE: CMPro Lancair
 

WILL DO

RE: CMPro Lancair
 

I have read through this forum a couple of times with great interest as I built my CMPro Lancair. Now here is my experience and some questions.
I have assembled and flown more than 20 ARFs and bought the Lancair because it was strikingly different in appearance. I have powered it with an ASP 52 4-stroke.
All 3 flights to date have been disastrous; my beautiful plane is now looking rather battle-scarred!

The maiden flight seemed to go OK, just steady flying without any aerobatics, but on slowing and turning downwind in preparation to land saw it “fall out of the sky” from about 30 feet up. There was severe damage to the front end, some damage to the wings and quite a bit of cracking/creasing of the fuselage.. Fortunately I always leave the cowl off for initial flights.

After repair, I asked our club's top pilot to test fly it. And even he had unusual trouble! Firstly it wanted to stay glued to the ground and required heavy use of elevator to achieve a take off. Maybe too much down-thrust?
Secondly, anything but the slightest use of elevator caused the plane to snap roll! The elevator is set at 7mm up, 8mm down – with lots of exponential. COG is slightly ahead of the recommended forward position of 72mm.
The landing was fast but successful.

We moved the COG forward slightly but his second flight exhibited the same behaviours as the first, plus this time the plane attempted to roll on take-off and on landing it crashed the last metre to the ground. More damage!

We notice that the horizontal stab has 4mm of anhedral on each side. Is this normal and/or OK? Or could this be the cause of the snap rolling?

Also, the plane seemed to fly with its tail sitting low even after moving the COG forward slightly.

I note that some in this forum have great success with their Lancairs, yet others seem to have problems (particularly with use of elevator). Why such a vast difference? Is this plane actually an unstable design?

I would appreciate any suggestion/assistance that members can offer – before I commit it to the skies again.

Thanks,
Bill

RE: CMPro Lancair
 

I fly mine at 72 mm cg and that seems just right,dont think it should be more forward.
this plane needs lots of speed,it seems more stable the faster you fly it.
I had a 46 in mine and have pulled it to replace it with a 55 ax.
You say that you have plenty of expo on the elevators,mine are set at 50 % and she is still touchy. I think you should try flying with the cowl on the plane has a very short fuse and with such touchy elevators they could be in the turbulance caused by cowling being removed.You have a very wide front end on a short plane now,i might not be right but i would not fly mine without the cowl.
Also the extra drag is going to kill your airspeed and thats what this plane needs,i am sure mine will be a hoot with the 55 in.
Just the fact that they all take so much runway to get airborn shows the need for airspeed.
You say the plane just dropped out the sky on landing approach this also lends me to think the missing cowl is to blame as they do need a ton of speed to land but yours will bleed speed extra fast and the turbulance created by the large unclean frontal area will disturb the airflow at the high lift area around the wing root.
This plane will also develop lift over the canopy due to the shape but again in your case i think not.
Good luck,dont give up.

RE: CMPro Lancair
 

i agree with alo 111 flying without the cowling is killing the aerodynamics of the plane and sounds like that is alot of the problem and the COG being foward would also casue the plane to want to drop out of the sky like a rock at low speeds. The horizontal stab shouldnt have any type of dehidral of any kind up or down it should be straight across i think that would cause the plane to want to snap roll mine doesnt have that problem it flys like a jet.

And i would say that the plane should be flown like a jet fast. landings are fast but i havent had any problems with mine wanting to snap roll on use of the elevator. i have mine setup to use flaperons on landing and this has helped landing at slower speeds. but if there used it limits the aeleron control and it is best to not let the plane slow down to much and alot of elevator needs to be used with power on landing.

If the plane dead sticks it wont float to the ground it will want to stall and has to be flown in with a step descent to keep air speed up then flared hard to make a successful deadstick landing. on;y has happened to me twice so far. but i havent had any issues of the plane snap rolling did you check your center axis COG side to side such as the left side being heavier then the right side ect.

If the planes is hevy on one side that may cause it to want to snap to one side on use of the elevator this is a plane that is very sensitive to the cg being correct and all flight surfaces being correct it is not forgiving in any way.

It takes alot of runway to take off like a jet and alot to land like ajet and has to be flown fast like a jet to maintain lift and the flight surfaces dont require alot of movement.

I have no expo on mine but my flight surfaces dont move that much i think my elevator is set only at maybe 5 or 6mm up and down have to check that. But definetly fly it with the cowling on it and you will most likely notice a difference. I have flown mine 6 times so far and had 2 deadstick landings and no damage or bent landing gear as other have had i land on the rear wheels and let the front touch last.

If the plane is built corerectly and flown corectly you wont have any problems it is a great scale flying plane that has the feel of a jet in my opion.:)

It is the scriest plane i have ever flown due to the fact that with changing conditions during flying can cause the plane to fly differently i took mine up the last time and the winds were about 10 mph and then dropped to almost nothing calm and IMO it was alot harder to fly without the head wind. And the plane of course picked up speed. my guess is i have had mine up to at least 60 Mph or faster but i have sealed everyting there is no gaps anywere on the plane all the surfaces are smooth and i wipe it down with a spray on silicone before i fly it just to see if i can get it to go faster and seems to have made a difference in the way it flys. but i dont do any type of aerobatics with mine. i fly it like a pylon racer. usually fast and straight and wide turns. :eek:

RE: CMPro Lancair
 

HEY Linkadrip how you doing?
i received that os 55 ax its the same size as the 46 vmar so its not going to be a problem to fit.
will let you know how she rips !

RE: CMPro Lancair
 

Hello ALO

Cant wait to here your report:)