ok guys....i have a little question to ask...when i am doing a hover, my plane will start to drop out of the hover no matter what throttle that i have on it....

all i am askin is wha should i do to ix this problem, because otherwise i can hover great.....

right now i have a 14 X 4W on an O.S 70 surpass two.....and it will do everything else amazing with the current setup....would this be a prop ptch problem??

Andrew

Do you mean drop out like it doesn't have enough power or the plane will just not stay in a hover. I couldn't get mine to hover consistantly until my cg was set at 6" or more. Mine is set at 6" and it still lands easily. I run a Saito .82 with 14 x 4w.

all i am talking about is when the plaen is in a hover, no matter what amount of power i give it, it will drop out or slide off to the side instead of moving up in the air farther which you would expect during an addition of power during hover.....

Andrew

a couple of people in my club told me that i needed to change the pitch of the prop, but i don't know which way to go with that...since the plane already goes like a bat out of heck with the full throttle....

The problem is not your power setup. It is with the plane. Funtana 40's rudder has insufficient yaw authority. You pretty much have to get a full blast and full rudder once the plane yaws off. I have tried many props on my FUntana 40 w/ Saito 91: APC 15x4W, 14x6, and 13x8. None seems to help the weak yaw authority. I even supersized the rudder, which only increase high speed sensitivity, but does little for low speed. I have concluded that the fuselage shape is very unhealthy for the rudder.

I would tend to disagree with that opionion. My brother has a Funtana 40 with a OS 70 on it not enough all out power for hovering. You may want to try a 13x4W to get some extra RPMs you havent said what it tachs out at with the 14x4w. If your spool time is lagged but the plane has enough power to fly with then I would say try the smaller dia prop. if in fact spooling up is quick and responsive then I would tend to say this plane is too heavy for the engine. Your thrust to weight ratio for a good 3D machine should be 2:1. A saito .82 or even 100 wouldnt be a bad idea. The Saito 100 weighs as much as the OS 70 does. Then you could use a 15x4W man talk about prop wash no issues with rudder authority anymore. PS. My brother is currently using a Saito 100 on his and it has cured all issues. If your plane has weak rudder authority then it should no matter what pitch it is in weather straight up or falling off pull out when you throttle up, no questions asked. To address the rudder itself keeping in a hover will be very very difficult if indeed there isnt enough authority. But it shouldnt fall off and not pull out when you throttle. You may however have 2 separate issues that need to be addressed individually. My vote goes with the power. These planes have an oversized rudder so you can hover and I have never seen one that couldnt because of the rudder. Although I am not saying that it has never happened. Clearly MO

How much does the plane weigh first off? Thats probably your problem is that it just plain ways to much. Did you add weight or move the battery?

I think the Surpass 70's power to weight ratio suks IMO get a saito 82 or 100, i run the 82 with a 14X6 prop and it holds a hover wonderfully, and right now my motors running like a dog (my fault of course ) I have plenty of pull out also

currently my plane wieghs about 5.5lbs, so i don't think that the weight is the problem. i have finally got the motor running perfectly to the way i want it, and i have no cash availalble that i would be able to buy the fa-82 and install it.....i think i will try the change of prop, getting more rpms out of it may help, especially since i already have a 13X8 laying in the basement that i originally had installed, but wanted to slow it down a little....

one other quick question while we are on the subject of this plane, what shouldf i do to seal in between the ailerons and the main wing?? i was starting to get a little worried last year when i started doing some fast flying about getting some flutter and then putting it into the ground.....

Andrew

Given the large control surfaces of this plane it is not meant to fly fast you are headed for cetain destruction if you plan on doing this. The prop you mentioned is not a 3D prop so it will be difficult for you to perform with. And it will give you lots of speed. Be careful!!. If you can swing the $$ try a 13x4W as i mentioned above it will increase your RPMs and keep the airframe from overspeeding on full throttle.

I agree with everyone. The funtana needs more rudder and a .70 is kinda marginal in that plane. I flew mine with the saito .72 (lighter and slightly more powerful). While I did get it torquing on the deck it sure did strain to pull out. After a couple of crashes and an ounce or two was added then the .72 was just not enough for it. So I sold it and got an Accel Hobbies KatanaP .40 and WOW.

Yes, Funtana 40 will yaw if you give enough thrust and rudder. But it requires too much of both to hold a hover. A good 3D plane should require only moderate amount of rudder and throttling to correct yaw from a slight fall-off.

I agree to a point, but that also depends on tha fact that the plane is propped corretly. If you run a 13x8 as an example on an OS 70 for the Funtana it will most definatly look as though you do not have enough rudder to make the plane yaw in a hover. Theres just not enough prop wash going by the rudder to make the plane respond while its not moving. The same goes for too big of a low pitched prop. You need the recomended RPMs as well as a wide Dia prop to create the wash and the 14x4W may not be getting your plane up to RPM's quick enough hence the apperance of a lagging rudder. I am not saying its not but changing a prop and trying it out there is definatly an eaiser way to go than redesigning a rudder or getting rid of a plane until you have exhausted all of your options. I would try the prop thing first. It may be to the point where a 4W is too much and you might need a straight 14x4 instead of the W. Granted the W wil give you a more powerful wash load as the 14x4 will just incrase the amount across your surfaces. When I was trying get my prop right I had to purchase 4 of them and see what worked best for me. Not that I wanted to but in the end I was glad I did.

You may also want to try the 13x4W or the 13x6. I like these better than the 14x4w on my ys .63 (better throttle response).

Yea I agree the refrence to 14x4W was for exlanation only. I stated above i use a 13x4W as well for the same reasons you do. Much better throttle response.

thanks for all of your help there guys.....i mean i am getting the clubs aerobatics guy to help me set it up for 3d before the flying season starts, and i want to at least be able to hold a hover before really letting loose with it.....

i have a 13x8 sitting in the basement, so i may try throwing that thing on it for the first flights of the year, an if it still doesn't do it, i'll go out and buy the 13x4W....

also, based on what you guys wo have one and are doing 3d with it., what should i expect?? do i need to strengthen anything to help it carry the load of air that will be hitting the wing as i go to perform a wall or waterfall??

Andrew

P.S thanks again

Absolutly no slop at all in your control surfaces. Make sure they are tight. Tail flying wires might be a good idea if you dont already have them. that fuse is really flimsy some times on a fast snap you can see the back half of the plane follow the front around. Flying wires are just oin case added support. Last but not least have fun.

I have been bending my Funtana 40 left and right, yet it still held up.

For prop, I think 13x8 is too much load for OS 70. All my friends (1 w/ Kyosho Cap, another w/ UCD 46) with this engine were very happy to see the results after I suggested them 14x4W.

The only thing you have to do it to tune your model. Check is engine aligmnent, you simply have to add "shims" (is that the correct word?) to add upthrust or side thrust, the firewall is already having a angle to fight the torque of the engine , but you might have to add more !!!!
Just add small washers to add space behind the firewall and the engine mount. This should correct the problem.

My funtana is having the same problem, it would simply not stay in position and slide to the right side of the fuse, so I had to add 3/4 rudder to the left to compensate and even I could not keep it straight vertical to ground, I just added a few thin washers behind the the engine mount and firewall to decrease the angle of the engine to the right and it helped greatly, I am not still finished, it takes many flights to properly tune the side thrust ratio and up/down thrust ratio.


By the way the 14/4W makes the job, but I am affraid the 70 is a litlle underpowered. I have a Saito .91, Wow. !!!!

I think you are asking too much out of the OS 70. It will fly it all right but to really hover well and have enough power to pull out with authority you need more power. One of the guys at our club has a Funtana with an Saito 91 and it does really well in a hover.........

I agree that the OS 70 may be part of the problem. Another club member has a Saito 72 on his and he doesnt have what I consider enough power to be doing any low hovering, his 72 is like my OS 61fx, it has enough power but is marginal when the rudder touches the ground and you have to start staight up from a dead stop, the OS91fx puts you mind at ease cuz you know you have plenty of power to pull out, but without investing in engines I would definitely try some other sizes and pitches, it is amazing the difference when you find the prop that just "works" with youtr setup.