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GrandRC . CanoMod . A Main Hobbies

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Got Jet Fuel? Turbine Helicopters > another NOTAR fuse on the way
 
 
md600n
Heliman
Location:

Just wanted to let it be known about the late-spring 2003 release of my md600n NOTAR fuselage kit. I will be sending it to St. Louis in December for production mold work.

To see the site I have set up detailing the progress, go here:

http://www.geocities.com/md630n/MD630N.html

Any questions, comments, or concerns just drop me a line at md630@hotmail.com

Tom Hoffmann
Columbia, MO
08-30-2002 Over year old.
HOMEPAGE  
 
 
Heli-Driver
Elite Veteran
Location: Arlington, TX

Cool! Would you make a EC120 Colibri while you're at it?



Raymond

Predator Gasser SE/231 X 2
Century Helicopters
08-30-2002 Over year old.
HOMEPAGE  
 
 
ScottG
Veteran
Location: Ft. Wayne, Indiana

Tom will that fuse fit a Jetcat set-up?

Scott

What part of " Shall Not Be Infringed" do you not understand...??
08-30-2002 Over year old.
 
 
md600n
Heliman
Location:

The fuse is designed from the get go as a home for a turbine. You could fit a bowling ball within it. The JetCat mechanics utilize a gear driven dog which would, under normal circumstances, drive a tail rotor. This "PTO" (power take-off), if you will, is what drives the Ramtec (Trim Aircraft) fan via a 4.3 inch carbon graphite shaft with billet u-joints at each end. The exhaust from the turbine is ducted out the scale exhaust area. Because the full scale NOTAR principle uses the Coanda effect in concert with the downwash of the main rotor, it assumes a very low operating pressure in the duct (tailboom). There are slots in the tailboom of the full scale ship to make this happen. In a model, the Reynolds number would indicate this is not necessary. So...The Ramtec fan is good for +/- 15 pounds thrust with a HOT BVM .96 in a ducted-fan, fixed wing application. Yaw authority with a computed model is very crisp with snappy response. As with the 1:1 machine, the model uses "active" vertical stabs coupled to the motion/movement of the rotating thrust duct at the end of the tailboom.

Additionally, I am currently hashing some details out with a producer of a scale, 6-bladed head from South Africa.

Stay tuned to the site for progress and a release date.

Regards,

Tom Hoffmann
Columbia, MO
08-30-2002 Over year old.
HOMEPAGE  
 
 
md600n
Heliman
Location:

Oh, BTW...

I'll leave the Fenestron-specific molds to others who've been that road.

I'd LOVE however, to have one of Len Mount's EC155B N4 Dauphins one day.
08-30-2002 Over year old.
HOMEPAGE  
 
 
vetrider
Elite Veteran
Location: Daleville, AL (Ft.Rucker)

6-bladed head

The US ARMY has an upgraded heli with 6 blades. I'd be interested in the head. Keep us in the loop, Tom.

Magnum Fuel
08-30-2002 Over year old.
 
 
ScottG
Veteran
Location: Ft. Wayne, Indiana

Sweeeeeeeeeeeeet!! I can see a new project on the horizon....

Scott

What part of " Shall Not Be Infringed" do you not understand...??
08-31-2002 Over year old.
 
 
md600n
Heliman
Location:

Considering the amount of interest I've seen in the EC120 at RCWATCH and what's going on over here, I am going to get the documentation together to begin a mold plug of the EC120.

I am a high school special ed teacher by day and the md600 NOTAR project will be completed first. So given that, I can at least get started on a Colibri.

This is what I need -

What scale?
What material (gelcoated glass and/or carbon graphite)?
What will be used for the Fenestron (VARIO)?
What will constitute a full kit (In other words - what exactly, do you need to have other than the fuselage itself)?

Any other input you can offer will be appreciated.

Please email at md630n@hotmail.com with responses -

Regards,
Tom Hoffmann
Columbia, MO
08-31-2002 Over year old.
HOMEPAGE  
 
 
BladeRunner
Elite Veteran
Location: Ontario Canada. Member of "some sort" s

NOTAR??

OK....... Keep the price under $500!!!!.......Well, you asked for input??????........ Looks like it will be sweet........keep at it...
08-31-2002 Over year old.
 
 
East Coast Scale
Key Veteran
Location: Taxachussetts

I am interested in how you are speeding up the fan in the back for yaw control. I contacted several makers of fan units after i did the prototype work for the Vario NOTAR here in the states, and thought it would work better with the fan off of the motor, and a seperate fan in the boom such as you are suggesting. All parties i spoke to told me the fan does not put out any appreciable amount of air until the motor gets to 15,000 rpm. What are you doing to the take off of the turbine to accomplish this, or is the maker of the fan unit redesigning the fan to have more air at lower engine rpms?
Joe
08-31-2002 Over year old.
 
 
md600n
Heliman
Location:

Hey Joe,

The shaft driven fan gets its power via a relatively small composite gearbox with a bull gear driving a sun gear. Right now, what I've got is at roughly 3:1 for a final drive to the fan. That fan starts to move gobs air without any appreciable lag from the moment it turns over. I am looking for velocity, not pressure. I may, in fact, be waaay over estimating what math I've done over the last three years but with the mock-ups I've put together to support the estimates...so far, so good.

That is one reason I have yet to put a cost on the kit. Once I get a fuse "pulled" from the shop in St. Louis and get some gear into it to see what it really does, I'll be in a better position to offer more detail about the final version.

It's not THAT far out of scale with respect to your 520. I've already had a few guys tell me that's what they'll go ahead and use for mechanics. My concern in doing that is the difference in weight. You already have to use a really hot Webra in a 520. Got any thoughts on that note??

Tom
08-31-2002 Over year old.
HOMEPAGE  
 
 
East Coast Scale
Key Veteran
Location: Taxachussetts

I have switched my NOTARS over to the Webra 91, and now have the power i need for the head and the tail. Without the big fan on the bottom of the motor, the 91 would probably be overkill, but you would have all the power in the world. You can use the current NOTAR mechanics in your prototype since all you have to do is put in one more gear in the front gearbox for the tail rotor take off to your gearbox which is driving the fan unit. In the 900, that would work, but not in the 520 as the takeoff point for the tailrotor is much lower than the boom. Your body shell appears to be big enough to move the mechanics slightly higher to accomodate this.
Joe
08-31-2002 Over year old.
 
 
md600n
Heliman
Location:

NOW THAT'S A TRICK I HAVE NOT THOUGHT OF!

Since a dozen or so guys have expressed interest in going with a JetCat installation, I have been trying to do what I can on my end to minimize any potential nightmares for them down the road.

I may have to give you a call in the coming months to get some direction on combining the VARIO 1022/27 mech set with a Ramtec fan (I have played around with a Dynamax unit though am partial to the simplicity of the Ramtec). I flew ducted fan a/c for a decade or so.

Oh, what's the rumor about OS coming out with a fuel injected .90-size engine?? I read on a Japanese website using a translator - they were considering a 1.04 displacement because of Robbe's big equipment...??
08-31-2002 Over year old.
HOMEPAGE  
 
 
Heli-Driver
Elite Veteran
Location: Arlington, TX

I want a Colibri!

Hey Tom,

I would be very interested in your Colibri project. I really want to build that heli.


Here are my wishes for a EC120 kit.

What scale?

I don't know the exact size of the original so I don't know what scale the model should be.

I would prefer a Vario SkyFox or Benzin Petrol Mechs. I know we can get the Fenestron, Scale head and other goodies directly from Vario. I would probably run a Webra 91 with a Zimmerman exhaust in the SkyFox so anything finishing out RTF around 16-18 lbs would be OK.

What material (gelcoated glass and/or carbon graphite)?

Gelcoated fiberglass would be wonderful. Panel detail would be a bonus.

What will be used for the Fenestron (VARIO)?

Vario Fenestron

What will constitute a full kit (In other words - what exactly, do you need to have other than the fuselage itself)?

A full kit could include laser cut formers and decking.
Complete Gelcoated body. Molded plastic windscreens (tinted?).
Opening doors and access panels.
Cockpit Basics?
Molded Landing Gear Fairings and Gear.


I am interested in a precision scale project rather than a sport scale.
Please keep us advised when you decide what to do.


Thanks,



Raymond

Predator Gasser SE/231 X 2
Century Helicopters
09-01-2002 Over year old.
HOMEPAGE  
 
 
md600n
Heliman
Location:

I'd be happy get started on an EC120. The first step - as Lars has indicated elsewhere is, however, obtaining approval from Eurocopter.

You'll notice the MDHelicopter logo "right up front at the top of my site" for the md600 - it took a while to get permission from the folks in Mesa. The license agreement states I have until 2005 to make the md600. At which time - perhaps they'll review things and grant an approval extension.

Having a license agreement is a safe way to make the fuselages. It protects everybody down the road.

So, that's where I will start. I can contact the folks in the legal department of Eurocopter here in the states come Tuesday.

Tom

Oh, spent another 6 and some hours final sanding the md600 mold plug yesterday. I LOVE surface detail!
09-01-2002 Over year old.
HOMEPAGE  
 
 
Heli-Driver
Elite Veteran
Location: Arlington, TX

Hey Tom,

Do you have any pics showing how you make those plugs? Or is it top secret? I wish you luck on the EC rights. I agree you want to get all that done upfront, no suprises, no worries.



Raymond

Predator Gasser SE/231 X 2
Century Helicopters
09-01-2002 Over year old.
HOMEPAGE  
 
 
md600n
Heliman
Location:

I'll tell you what...If you can let me know how to post an image here I'll do it.

Actually, I have used a process called STL. STL stands for StereoLithoGraphics which, in a nutshell, is a fast computer, a laser, some specific resin, and a bunch of UV light. That works great on a smaller scale. Revell of Germany uses STL to come up with their molds for plastic airplane kits.

The process I have used for the md600 is a little more involved actually. As far as I know ( and I have researched the 600 for over three years) other than MDHelicopters in Mesa, I am the only individual with station profiles of the 600 fuselage. That's a start.

Then you shape LOTS of foam. Lots of resin. A bit of Bondo and spot putty and you get pretty close to the final form. Since I am a stickler for accuracy, MANY hours of final shaping, sanding, and smoothing are involved until the shape matches the station profiles.

I'll share some images if someone can tell me how to get 'em up here.

TAH
09-01-2002 Over year old.
HOMEPAGE  
 
 
md600n
Heliman
Location:

Okay,

I just set up another web site with geocities to display a few construction images.

Stay tuned for the URL.

Back at ya in a few minutes.
09-01-2002 Over year old.
HOMEPAGE  
 
 
Heli-Driver
Elite Veteran
Location: Arlington, TX

If you can upload them to a server anywhere on the internet you can link to them here. Or you can become a member here and have a gallery where you can upload pictures.

If you can't do either of the above you could email them to me and I can upload them to my server so the pics could be seen here.

I'd really like to see more the building process. It's interesting to say the least and it sounds like a lot of work.

How do you get the contours accurate, are you provided cutaway drawings showing true contours or do you figure it out from multiple views?



Raymond

Predator Gasser SE/231 X 2
Century Helicopters
09-01-2002 Over year old.
HOMEPAGE  
 
 
md600n
Heliman
Location:

Go here:

http://www.geocities.com/md600notar/index.html

It's supper time.

I'll post descriptions later.

Tom
09-02-2002 Over year old.
HOMEPAGE  
 
 
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Got Jet Fuel? Turbine Helicopters > another NOTAR fuse on the way
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