Lefte

My Feedback: (1)

Hello everyone,

Please don't laugh, but I would like to increase the speed of my...Ahem Hanger 9 Twist...(pause here for laughter)

Here is what I have done

Runnins a Saito .72 on 30% nitro and stock APC propeller of 12 X 5.

What can I do (besides get another airplane or engine) to gain some speed?

Thanks for your time

Lefty

ChuckAuger

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Run a 12X6?? 12X7?? 11X9???

rockhouse

My Feedback: (5)

Flutter

Lefte

My Feedback: (1)

OK,
what's flutter??
Lefty

daven

My Feedback: (1)

If you want to go faster, you will have to add pitch to your prop. By doing this, you will also have to remove diameter or you will lug the engine down too much. Chuck listed some good props worth trying.

If you start to hear a cavetating / buzzing sound coming from your plane in a high speed pass, shut down the throttle and land immediated. Large control surfaces can flutter at high speed if you have gaps at the hinge line, or linkages that are not strong and sturdy. Doesn't mean you can't fly at high speeds, just gotta set your plane up appropiately.

TNRabbit

...you can also strip all the covering from the wings/stabs, reduce the control surface area by approximately 70%, cut/sand the wing thickness by @ 60%, then recover.

If you want to go fast, buy a Sig Kobra or GP Patriot. If you want a specifically built 3D/fun fly aircraft, don't change anything...

blw

My Feedback: (3)

Flutter is when the control surface(s) start a high freq ...uh, well, fluttering. It is very destructive. High speeds can cause it, improper hinge gaps and control rod slop/vibrating can cause it too.

We are repairing a plane that I lost on Saturday due to elevator flutter. It luckily hit in a pond, so most damage was to the wings. We have no real idea why it fluttered, but replaced ny-rods today with a single length steel rod and will cover the hinges to be safe. It fluttered before and stripped a servo, but was not difficult to land.

Razor-RCU

My Feedback: (50)

Why are you shootin' for speed on a Twist? The thick airfoil is designed for ANYTHING but speed-

Welcome to the Speed forum! Now get a Patriot or Whiplash or something and you will really get hooked!

ifixairplanes

My Feedback: (9)

reminds me of the guy that wanted to make his funtana fast.

sean

CONTENDER

LT,
The guys are right, I have a Saito 72, on an Aresti,running a 12x6 prop, and I shattered the horizontal stab, coming out of a modest high speed dive due to flutter. And remember, the Aresti is built much stronger than the Twist, and does not have built up control surfaces!
In fact, I have an original design, much like the Twist, that I fluttered so bad on a level, full throttle run, that it blew the covering off the bottom of one wing......and it just took a second!!! ( Picture below .. Max 46FX )
Spend a few bucks, and get a Predator or Tower Kaos and have a ball!!

CONTENDER

Flyboy Dave

My Feedback: (21)

I had flutter on my Arresti as well, in a shallow high speed (full throttle)
dive. [X(] The horiz stab broke. I fixed it, and reinforced both sides, and
put on the tail brace. Then I did away with about half the elevator, and
it looks kinda normal. I think the oversized elevator caused the flutter.

Good thing it had two elevator rods....I brought it in on the remaining
good one....the broken stab was just flapping away.

It was a sure case of pushing a plane over the design limit !
( what else is new ) I have an OS .60 FSR on it.

FBD.

edh13

My Feedback: (9)

I had an Aresti with a piped Rossi .45. Heard about the stab problems so I was always on the look out. Never had a problem and this thing hauled *ss. I can't help but wonder how many stab failures are due to a #11 xacto cutting away the covering for the glue joint. Always use a soldering iron and always thin CA the bare would before epoxying the stab. I'm probably preaching to the choir in this forum.

CONTENDER

edh13,
Bingo on the #11 error. I'm sure that's what caused my problem.
Funny, though, I remember the original picture of Flyboy Dave's Aresti
problem, and it broke exactly where mine did, midway out on the leading edge stick, and right at the hinge line by the fuse. I fixed mine with cross brace sticks in the first two open bays, and with a carbon fibre strip, top and bottom of the hinge stick, right thru the fuse.
Cross bracing the open bays on both the control surfaces and the fixed tail feathers of the Twist, might help stiffen up plane to survive a little more speed, come to think of it!

CONTENDER

AirGar

My Feedback: (7)

The "Twist" or "Twister" is NOT designed for speed.....period. All your gonna do is tear up an air frame.

The "flutter" that these guys have experienced on the the Aresti however, is a design flaw....nothing more. They should be capable of 100 MPH speeds.

I can make any plane go fast.....the question is...How long can it go that fast?

Gary

Crazy4Flight

My Feedback: (540)

a funny noise made by rapid movements of the control surfaces, which can strip servo gears, bend control linkages, break hinges. If the speed of the A/C is not reduce ASAP then this noise "flutter" usaully proceeds a much louder noise of the A/C impacting the ground.

vicman

My Feedback: (10)

Dave, I had to do the same thing with my Miss Los Angeles this weekend, only the sruce leading edge of the elevator broke between the halves and then tore off the right half of my horizontal. After a brief terror session I landed with half a horizontal and elevator. I am now doing the same thing to the tail as you did with your Aresti. I wasn't going that fast either maybe 70 or 80. I was racing a Gilmore Red Lion and having a big time.

No pic of the damage but here is the plane.

ifixairplanes

My Feedback: (9)

Vicman, nice plane. you should contribute those pictures to the thread i have up called "hey proud dads and uncles". i thought it was gunna be more popular, but i guess not!

sean

Flyboy Dave

My Feedback: (21)

Vicman,

I'm glad your plane made it back in. [sm=thumbup.gif] I'm starting to get
a bit more strength conscious with my planes. I had the wing fly off my US 40
last summer to boot. Leaving it to the manufacturer isn't working.

They didn't know we were gonna whoop the snot out of these things ! [X(]

Check how little area is provided to glue the horiz. stab onto the fuse ! [X(]

Dave.

vicman

My Feedback: (10)

Thanks Ifix, my son and I have fun building and flying togeather. His plane is a Superstar with a .46 FX that kills the other trainers at the field, gotta start em out right .

Dave thanks for the pm. By the way them aint no kits! Built straight from plans! No more manufactured birds for me. Yeah I hear you about my kid's Superstar already... it was given to us from the lhs after someone else had made a futile attempt to destroy it with the earth. Yep a freebie fix and fly.

Be fast, fun, and safe!

britbrat

VICMAN, your son's Superstar has lots more potential to dazzle the "trainer" crowd. As a fun project, I hopped up an old Superstar & it turned out to be quite a machine. I took out all dihedral, fitted dual aileron servos & dropped the wing 3/4" into the fuselage. It has been converted to a taildragger & the landing legs faired to reduce drag. The engine is mounted sidewinder. The fuselage forward of the wing/landing gear location has been rounded by cutting 1/2 " off the corners of the fuselage/cabin & fairing in with 1/4" balsa. The nose is finished with a smoothly enclosed cowl & a 2 1/2 " spinner. Power is provided by a TT.46 Pro with Tower Hobbies "tuned" muffler.

With an 11-6 APC it will do >75 mph & has unlimited vertical. Rolls are reasonably axial, inverted flight & outside loops are a breeze & snap rolls are a snap. It flies an easy knife edge (with a bit of "steering"), can be provoked into a hover from a vertical climb & will do torque rolls as well.

I have it on floats now & it is still fully aerobatic (but can't do unlimited vertical on floats).

You & your son might want to try this with his Superstar -- it's the ultimate killer basic trainer. If you want I can email you a pic.

vicman

My Feedback: (10)

Dude, he is only 5! And remebering the Revver Brothers Credo to promise my wife to tone it down, I can't take him straght into turbines but sneaking a decent motor into his plane is acceptable.

Did you belive that rot?

You bet I want to see your pics! You know he is going to need some self induced repairs in the future.[>:]

8178

My Feedback: (17)

Clip 6” off each wing tip!

rc-mike

I am with everyone on the Twist. I have one and with an O.S. 70 with a 14X6 it goes about as fast as I would want it to. Much more and it would definately flutter. I had an Aresti that broke both sides of the stab at the same time. I had about 3" on one side and nothing on the other. The elevators were just hanging in the breeze by the control rods. Surprisingly I made it down. It would climb at much over idle and descend at idle. I sat it down smoother than most of my landings.

vicman

My Feedback: (10)

Patrick, the kid folded the wing on his Superstar today[&:]. Surprisingly it looks like the fuse is salvageable. Can you post the pic of your Superduperstar? I think I lost the ones you sent me.
I told you I would end up needing that info.