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new Arf Boomerang 14lb thrust

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new Arf Boomerang 14lb thrust

Old 03-10-2005, 02:20 PM
  #126  
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Default RE: new Arf Boomerang 14lb thrust

Alan,
Can you tell us what servo recommendations you would make for this bird? I have heard some say that extreme HD high torgue servos are not needed, but I would like to hear from some of the guys who are actually flying this bird.
Tommy
Old 03-10-2005, 03:16 PM
  #127  
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Default RE: new Arf Boomerang 14lb thrust

Tommy

I am using Hitec HS 5625 MG digitals on aileron / elevator/ flap and the standard Hitecs with carbonite gears on rudders.

Alan recommends any servo with over 63oz / inch for the flying surfaces. Personally I only use metal geared servos on aileron / elevator on jets and this model will do around 140 mph on a 15lb turbine. It is really up to you but I understand Ali Machinchy, Alans' test pilot is building one using cheap plastic geared servos. I expect if his servos fail he can just pull another model / turbine off the shelf!

I can't do that so I am going for overkill on the servos. I think you get much crisper response from digitals anyway.

Hope this helps.

John
Old 03-10-2005, 07:12 PM
  #128  
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Default RE: new Arf Boomerang 14lb thrust

Here's MY plan for the servos and why:

Ailerons, flap, and elevator.....Futaba 9252 92oz .14 sec 1.8oz Got them when I bought my 9CHPCM Not to mention they are fairly light at 1.8oz vs 2.1 on some others. Remember the elevator servo mounts way back into the stab. An 1/2 oz there saves 1 oz in the nose........

Rudders.........Hitec HS5245 61oz .15 sec 1.12oz MINI These weigh 1oz apiece less than a close to equivelant standard servo. 2ozs way back by the tail will save putting 4 more ozs in the nose to get it to balance. Thats 6 oz savings. Yeah I know Alan recommends 70oz on the flying serfaces, but come on, 61oz for EACH rudder seems just fine.

Steering, retracts and brakes....Hitec HS225MG 54oz .14 sec 1.09 oz. Good reliable servo for non critical operations at a good price. Weight not an issue but size is as these will be mounted up front and I know it will get crowded. May go with HS85MG if space gets real tight!

A JetCatUSA P60 is planned for the "push". Futaba Super 9C on PCB to guide her.

Wheels and brakes yet to be determined. My Reaction 54 has a nose wheel Kavan electromagnetic brake that is attractive for this application for two reasons...It mounts on the nose wheel and weighs several ozs and does not mount on the mains behind the center of gravity. The nose wheel retracts forward thus helping with a proper balanced model too. A "win win?" Landing speed looks awful slow so it might be just the ticket. At @ $55 bucks it fills the bill nicely. Substitue the servo and microswitch with a electronic switch and no muss or fuss. No air leaks either! Hmmmm....

Thats what I plan...Comments please?

Dave Rigotti
Old 03-10-2005, 07:14 PM
  #129  
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Default RE: new Arf Boomerang 14lb thrust

What is the phone # or e-mail address here in the USA to order one from?
Thanks,,,,,,,,,,,JOHN
Old 03-10-2005, 07:16 PM
  #130  
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Default RE: new Arf Boomerang 14lb thrust


ORIGINAL: heli4me

What is the phone # or e-mail address here in the USA to order one from?
Thanks,,,,,,,,,,,JOHN
http://easytoflyjets.com/help.htm
Old 03-10-2005, 07:20 PM
  #131  
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Default RE: new Arf Boomerang 14lb thrust

Thanks RCGUY
Going to get one on order.................JOHN
Old 03-10-2005, 07:29 PM
  #132  
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Default RE: new Arf Boomerang 14lb thrust


ORIGINAL: heli4me

Thanks RCGUY
Going to get one on order.................JOHN
I gotta believe this airplane is going to be very popular with the turbine grass field folks. At $699 plus $200 for the retracts...it ain't cheap but it is a good value. Saves 50 hours building time. The flight envelope looks "just right" Slows for easy landings and scoots along at 130+MPH. The "average" sport pilot has no idea how fast that really is when you're on the sticks! Real easy to overfly alot of field boundries at 200MPH! Looking forward to getting mine.

Dave Rigotti
Old 03-10-2005, 07:42 PM
  #133  
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Default RE: new Arf Boomerang 14lb thrust

That's why i am ordering one.
My field is grass and somewhat rough at times.
I agree price is in the high range for a ARF of this type but the video sure looked good.
The slow flying is what made my mind up for me..................
JOHN
Old 03-10-2005, 07:51 PM
  #134  
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Default RE: new Arf Boomerang 14lb thrust


ORIGINAL: heli4me

That's why i am ordering one.
My field is grass and somewhat rough at times.
I agree price is in the high range for a ARF of this type but the video sure looked good.
The slow flying is what made my mind up for me..................
JOHN
Hey..The price has to be high..it's for a turbine! :-)) The same airframe would be $200 less if it took an IC engine. Check out the "other" chinese made ARFS other folks are selling. Keep in mind the 1,030 square inch wing area, no fiberglass cowl or wheel pants. Get used to it! Not saying it's overpriced.......quite reasonable in the turbine arena!

Dave Rigotti
Old 03-10-2005, 08:58 PM
  #135  
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Default RE: new Arf Boomerang 14lb thrust

Yes i hear you there anything for a turbine and the price starts climbing faster than a bobcat with a p-120... :-)
Going to get my order in .....thanks for the info................JOHN
Old 03-11-2005, 07:14 AM
  #136  
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Default RE: new Arf Boomerang 14lb thrust

Folks,
Patricia has confirmed shipping of kits out of Dallas today the 11th via DHL. Most should arrive no later than Wednesday the 16th.
Alan could not have a better person handling customer service! Lovely lady! Stay tuned!

Dave Rigotti
Old 03-11-2005, 07:18 AM
  #137  
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Default RE: new Arf Boomerang 14lb thrust

Question for Alan,

Will 61oz-in digital servos be a problem for the rudder function? I know you say 70oz. ALL other flying surfaces are going to be 92oz digitals. I'm looking to save a bit of weight so far aft on the booms to help avoiding adding nose weight. I don't do hard 3d flying. I'm an ex pattern jock who enjoys all areobatics except flick rolls and blenders!
Comments please......

Dave Rigotti
Old 03-11-2005, 07:43 AM
  #138  
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Default RE: new Arf Boomerang 14lb thrust

ORIGINAL: rorywquin

John

Many thanks for the detailed reply.

On the U/c, do you think that the shorter (less flexible) legs may have contributed to the mounting block splitting?

Good advise on the epoxy coating. Is the heat shied ordinary aluninium ducting tape?

Can you tell me the servo count please.

It is hard to tell from pics but it looks like

1 - steering
1 - flap
2 - aileron
2 - rudder ??
1 - elevator ??

Thanks


Rory

Not to throw a cog into those US fliers of this airplane, but what are folks planning to use or do about brakes on this airframe? By the AMA turbine rules there must be a brake system onboard that will stop the airframe "on command". I believe this was a recent change in the rule set.

Cheers,

Old 03-11-2005, 07:49 AM
  #139  
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Default RE: new Arf Boomerang 14lb thrust

Specifically: http://www.modelaircraft.org/PDF-files/510-A.pdf

item #6


Cheers,

Old 03-11-2005, 08:27 AM
  #140  
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Default RE: new Arf Boomerang 14lb thrust

Brakes?

I was wondering about the same thing! What brake systems are available and fromwho. Any help would be appreciated. This will be my first jet.

TIA
Old 03-11-2005, 08:38 AM
  #141  
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Default RE: new Arf Boomerang 14lb thrust

I am using the Sierra Precision brakes (which come with BVM 2 5/8 main wheels and 2 1/2 inch front). They come with an adapter to work with the 3/16 inch wire struts. I am using similar wheels on my Reaper, and wanted to try the Sierra Precision units so I gave them a call. He offers them as a package deal with the tires for less than they sell on the BVM site (only a couple of dollars). WHen I get them mounted I will let you know.
TOmmy
Old 03-11-2005, 08:38 AM
  #142  
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Default RE: new Arf Boomerang 14lb thrust


ORIGINAL: Meesh

Brakes?

I was wondering about the same thing! What brake systems are available and fromwho. Any help would be appreciated. This will be my first jet.

TIA
See my post #128

Dave Rigotti
Old 03-11-2005, 08:40 AM
  #143  
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Default RE: new Arf Boomerang 14lb thrust

Duh![&:]

Thanks Dave!
Old 03-11-2005, 08:51 AM
  #144  
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Default RE: new Arf Boomerang 14lb thrust

Hey Dave,

Hobby Lobby has the Kavan Brake for $45.90 each! Bottom of the page.

http://www.hobby-lobby.com/wheels.htm

Bob
Old 03-11-2005, 11:25 AM
  #145  
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Default RE: new Arf Boomerang 14lb thrust

Dave

I am sure these servos will be fine on the rudders. They are not that large. I know of a guy who is flying one of the pre-production kits in the uk (Mark Hinton) and he is using very small non digitals on his rudders with no reported problems, again to keep the tail weight down.

I think I may move in that direction to get some of the lead out of the nose. I have still to try moving the CG back another 15mm or so.

John
Old 03-11-2005, 11:37 AM
  #146  
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Default RE: new Arf Boomerang 14lb thrust

The Big Brown Truck just delivered my PST-600R Turbine from Frank Tiano!
Next week the Boomerang!

Life is good!

Old 03-11-2005, 11:41 AM
  #147  
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Default RE: new Arf Boomerang 14lb thrust

I have one of those as well, PST 600R, what a beautiful little engine, totally amazing. I can hardly wait to get this thing strapped on the business end of this plane, it should be a real performer.
Tommy
Old 03-11-2005, 11:48 AM
  #148  
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Default RE: new Arf Boomerang 14lb thrust

Hi Tommy,

I was very impressed also. It's a real jewel

Have you run yours yet?

Are you using Kerosene or jet fuel?

Thanks
Bob
Old 03-11-2005, 11:49 AM
  #149  
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Default RE: new Arf Boomerang 14lb thrust

Seems to me that Dave Rigotti (see post 128) has the right ideas for weight saving aft of the CG. I have used midi servos on the rudders and they proved to be fine. Using less weight in the tail area is definitely effective in producing a lighter final weight by a much bigger margin than you'd think.
As for brakes, my Intro will stand stationary with the turbine idling and stop after landing. I have used add on brakes with Robart wheels successfully, but I'm going to try those Kavan electro mechanical ones on the nose wheel only and see if they do the trick and maybe save another few ounces.
Old 03-11-2005, 11:52 AM
  #150  
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Default RE: new Arf Boomerang 14lb thrust

I have not run the PST yet. I plan on doing so soon. SHe is still in th box. My friend has two of them and they run great. Start right up and put out a trmemndous amount of thrust for something of this size. I have not read the book yet, but I probably will be running Kero, since that is what I run in the other engines I own, with Aeroshell turbine oil. My newphew works for Shell so I have to support him.
Tommy

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