jldecarlo

Here's how I double beveled the tail surfaces on my H9 Funtana.

The first shot it the before of the elevator throw:

jldecarlo

Just the stab

jldecarlo

Peel back the covering being careful not to tear it.

jldecarlo

Sand or use a razor plane to make the bevel

jldecarlo

Carefully re cover. Notice how the white covering laps onto the under side bevel.

jldecarlo

Voila!

jldecarlo

Same with the rudder. You will have to do the fin and the rear of the fuse. You have to do it twice for the rudder, but all of the coveing is white, so it is a little easier.

BTW you have to sand the bevel in the fuse because the grain runs the wrong way - you can't use a razor plane.

Photo shows the end result


Leonard

TT2

My Feedback: (13)

I wish I had it to do over again...looks VERY simple and quick to do. Thanks for the tip.

-Tom

jldecarlo

Less than hour start to finish for both rudder and elevators.

Leonard

ElectRick

My Feedback: (2)

Is more than 45 degrees of throw each way really necessary (on this plane)? I would think that the surface would just stall and/or act as a brake much beyond this point.

Rick

AdrianM

Exacty, I saw a Diabolatin fly this weekend with a full flying stab and 85 deg of throw. It entered the wall manuver so abruptly you would swear the tail would snap off. It would also do the tightest water falls I had ever seen. With no fixed stab area and massive throw it would just vector the prop wash and pivot on the CG.

jldecarlo

I don't know yet how much throw I will need. I can always reduce the throw if I need to, but I can't increase it above the mechanical limits.

Also, these pics are of unglued hinges. When I glue in the hinges and seal the gap, it always reduces the throw at least a little bit. I don't plan on using +/- 90 degrees, but I don't want to get stuck either.

Leonard

TailTwister

My Feedback: (1)

I wish I had done that. I almost did. I get about 52 degrees of throw with the stock set up. I can't get a good waterfall. I'll bet set up like that it does really well.

coony2787

My Feedback: (33)

if you cant get a good waterfall with the elevator you have why not just use spoilernons ?????


Chad

TailTwister

My Feedback: (1)

I have never heard of spoilerons making a tighter waterfall. If anything, I'd guess that they block airflow over the tail and make it worse.

I guess I could give it a try.

Also, for those reading and preparing to assemble, the double bevel rudder may not be worth the effort. My rudder touches both elevators with the single bevel. There isn't much sense in doing the work for no gain.

I do think the elevator hinge line needs a double bevel, however.

seanychen

My Feedback: (4)

The extreme throws are for when the plane is not flying, but rather have the tail deflected by the thrust blast. I'd say 90 degrees is too much, since it just blocks the air w/o deflecting the surface. 60 degrees is probably the best max. deflection. Beyond 60 deg, more energy is being used to block than to deflect.

Flaperon can make tighter waterfall, as proven on my UCD. With full down elevators coupled to both ailerons moving *up*, it does much tighter waterfall and KE spin.

Double bevel is not needed if you don't want to tighten up the waterfalls & KE spins.

stdun

I beveled the stab yesterday, thanks for the tip, but is there still need to do the rudder? Doesn't the elevator prevent too much travel?

seanychen

My Feedback: (4)

That's when I start re-shaping the elevators.

JimmyD

I have a question on the double bevel and servos. The manual calls out standard servos. Is 43oz really sufficient with the control surfaces and travels we're talking about? Maybe with 5 cells to increase torque and speed a bit? The double bevel on elev. looks like a good thing to do, and for crawling around slow I imagine its fine but a wall or parachute would surely rip a standard apart no? What are you guys using? I just ordered a funtana from Minnisota RC and was gonna put in some new Futaba 3004's I have lying around and a Saito 80 (also lying around looking for a home). Should I reconsider? Thanks.

TailTwister

My Feedback: (1)

I fly the Hitec HS-545s on the tail. At 6 volts they put out like 77 oz in of torque. My ailerons run on HS-525s which put out like 55 ounces, but fast!

I always over servo the tail, as good linkages and good servos are all we "arf-folk" have to fight off flutter.

I'm not saying that the servos you have selected will not hold, but for me, I like a bit more muscle on a 3D tail.

Good luck.

coony2787

My Feedback: (33)

your stock servo's will work in this plane i'am running all stock servo's and have had no complaints at all!!!!

as for double beveling the elevator i think it would be worthless since this plane snaps on elavator already more throw will just make it worse!!!!!! the stock throw you get out of it is more than adaquate for any manuver


Chad

TailTwister

My Feedback: (1)

I think the point of the double bevel was to improve spins and waterfalls. It does neither well with the stock set-up.

I run almost 20 degrees of throw on low rates with no snap at full elevator at flare. I run about 10 degrees of flap too. Landing speed is very slow. My CG is behind 5 1/2 inches.

My high rate is about 52 degrees of throw and there is no flat (or knife edge) spin or waterfall to be had. If I had it to do again, I'd double bevel my elevator in a second.

coony2787

My Feedback: (33)

add some spoilerons in on that waterfall and it will be tight and also try some flaperons mixed in to do the flat spins


Chad

TailTwister

My Feedback: (1)

How much do you use?

Please give me an estimate of the degrees (or measurement) in relation to the elevator. For example, if the elevator is 50 degrees then spoilerons are what? The same for flapperons please.

coony2787

My Feedback: (33)

i use all i can get mixed , meaning that when i flip the switch spliolerns work with the elevator.

also for some more fun mix the spoilers in reverese direction to elevator , you talk about some tight loops


Chad