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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Scratch building a 1/4 scale Jetranger and Longranger
06-05-2008 02:12 AM  12 years ago
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Rotor George

rrApprentice - Tampa, Fl MyPosts All  Forum  Topic

Scratch building a 1/4 scale Jetranger and Longranger
Hi Guys,

I was so very inspired by Yvon's thread here;
http://www.rotory.com/fusionbb/showtopic.php?tid/75878/

that I've decided to scratch build a 1/4 scale Jetranger.....my first project of this type.

There a couple of reasons why I'm choosing this particular helicopter. One of the main reasons is that I have a ton of reference material and access to several of the real ones which will help in an accurate model, plus I've always liked the look of the Jetranger.

This should turn out to be a challenge but a fun one at that. Thanks goes out to Yvon's excellent build thread!

Here's a few images of the progress.

As a added note, I've decided to build a Longranger at the same time. It's only an additional 6" of fusealage and a longer tailboom.

I'm at the point now of re designing the top section of the Longranger. I should be ready for foam and shaping soon.

Until my next update,
George
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06-05-2008 03:13 AM  12 years ago
marc28

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You got some skills....I will be watching this thread
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06-05-2008 03:20 AM  12 years ago
jetfixrguy

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Florida

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+2 I have subscribed.
I am really amazed at the way this is starting out. Makes me want to try something in the scale department.
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06-05-2008 03:27 AM  12 years ago
trunkmunki

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Bangor

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just watching
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06-05-2008 09:32 AM  12 years ago
Frank Bostwick

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WOW thats a great project and good work. I just followed that link and now my dang head is BUZZIN with ideas. Guess its time to start a scale! Please keep adding to your thread.RIP ROMAN
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06-05-2008 03:41 PM  12 years ago
Rotor George

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Tampa, Fl

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re-design
Hi Guys,

Thanks for all the kind words!

I've redesigned the center spar of the top section, adjusted the angles and added a curve at the rear portion close to the tailboom attachment point. This third attempt should be the final then I can stretch a section of it out for the Longranger.

George

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06-05-2008 10:53 PM  12 years ago
Rotor George

rrApprentice - Tampa, Fl MyPosts All  Forum  Topic

I finished the re-design of the top section of the Jet Ranger and am happy with it, I allowed myself room for the foam this time.

The top section of the Longranger differs in a few ways which I'm working on now. I also added a windshield center spar. As I'm sure everyone knows, each side of the windshield itself actually bubbles out from the center point. I'll get to that later on in the build.

George
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06-05-2008 11:47 PM  12 years ago
CitationX

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Danville, IN

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FINALLY!!!

Like many others, I was also very impressed with the work Yvon did on the Hind. This is what I call "grass roots" scratch-building at its finest! The Jet & LongRanger is a tried and true machine that goes very well in the scale R/C market. I will definitely keep an eye on the progress as my ultimate goal is to do the same thing but in the form of a Bell 407.

Just out of curiosity, what mechanics do you have in mind for either fuselage? I have posted on RR & HF the difficulties with installing the MA Spectra-G mechanics in any fuselage (except for the IndyHeli's Apache) due to the frame height.

Great work!
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06-06-2008 01:24 AM  12 years ago
Rotor George

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Tampa, Fl

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407
A 407?! Oh that would be sweet....hmmmmm I may just make one of those too, I still have 2 more 4x8 sheets of cardboard. LOL

I haven't decided on mechanics as of yet, but there will be plenty of room for just about anything...especially the Long Ranger version.

George
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06-06-2008 04:03 AM  12 years ago
CitationX

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You mentioned having tons of reference material and access to several real machines. Well, I have access to a real 407 but when it comes to reference material, I have yet to find anything readily available for the 407. What I would ultimately need are cross-sections at the various station and water-lines.

I noticed in a couple of your photos some large scale drawings from a Miniature Aircraft LongRanger fuselage. That would be ideal. I have found on-line some 3D CAD model files for a 407. I am just not sure how accurate they are. Here is a link to one:

http://www.exchange3d.com/cubecart/...r/prod_755.html

It will be very interesting to see the progress on this once you get to laying in & shaping the foam. I have to assume you have experience in making molds and working with fiberglass. My experience...none. Can't wait!

Thanks
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06-06-2008 04:12 AM  12 years ago
Rotor George

rrApprentice - Tampa, Fl MyPosts All  Forum  Topic

Well.................
I stumbled across a major design error which has forced me to scrap these two models and start again

Not really that big of a deal money wise($5-$6 in cardboard) but I really want to do it right, and if I let it go now it's going to bug me every time I look at it. It's in the main fuselage angle, looking at it from the side it's currently too straight and needs to have more of a curve up towards the tail...if that makes any sense.

The new design is already printed out and with the new build changes I'll probably have it completed by late tomorrow night.

Update....heres the updated version. Arrow indicates the location of the curve missing on the previous version.

Citation X,
My fiberglass experience was with r/c boats and scratch building hulls for weed wacker motors but the process is the same as making a plug. This will be my first attempt at making a mold and pulling a part from that however. Thanks for that link...I'll check it out.

George
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06-06-2008 05:24 PM  12 years ago
marc28

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George,are you planing on making the tail section removable? What will the deminsions be? I would be interested in a 1/4 scale Long Ranger

marc
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06-06-2008 07:22 PM  12 years ago
Rotor George

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Tampa, Fl

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The tail will have to be removable....total length rotor tip to tail stinger will be approx 10.5 feet.
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06-07-2008 12:15 AM  12 years ago
Rotor George

rrApprentice - Tampa, Fl MyPosts All  Forum  Topic

Welcome to my Bell Helicopter factory.

While I was at it I built a 407 also. I have a couple of details to add then back to work on the top redesign. It's going to have to be redesigned to match the curve of the fuselage.

George
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06-07-2008 12:36 AM  12 years ago
CitationX

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Danville, IN

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You can't begin to tell me this thread isn't anything short of outstanding!!!

George - Just out of curiosity, where did you get the scale documentation for the 407? I have looked all over the internet for bulkhead cross-sections from tip to tail. From what I can tell, the 407 has some slight differences in the fuselage width and possibly some tweaks around the upper "doghouse" area.

You are right about the tailboom angle to the fuselage. I was looking at the 407 nearby today and it is quite pronounced.

Keep up the good work!
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06-07-2008 07:35 AM  12 years ago
Rotor George

rrApprentice - Tampa, Fl MyPosts All  Forum  Topic

Citationx,

First I took two drawings, one of the Long Ranger and one of the 407 and superimposed them one on top of the other.

I then used the bulkheads I already had and in photoshop widened the three to correspond to the drawing.

The top fairings are different too, but I'm still working on those.

George
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06-07-2008 03:05 PM  12 years ago
CitationX

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Danville, IN

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Looks accurate enough to me! I like the idea of using cardboard for the mock-up. I am assuming that blocks of foam will be cut to fit in all the "holes" in the mock-up? Seems much easier and cheaper than using wood.

Looking forward to your next update.
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06-08-2008 01:43 AM  12 years ago
Rotor George

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Tampa, Fl

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407
I got the top section of the 407 completed today and made sure I left room for foam this time. ......glad that's over.
The 206L and 206B are finished but not glued together..taking a break for tonight.

CitationX, yes the holes will all be filled with foam in preparation for shaping. It'll be one solid mass when complete.

George
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06-08-2008 06:42 PM  12 years ago
Rotor George

rrApprentice - Tampa, Fl MyPosts All  Forum  Topic

Ready for foam!
Hi Guys,

Here's the latest progress photo. Everything is built, now I'm ready for foam and shaping. I included a photo of the 206B....I think it already has a good stance even without gear, hopefully they will all look accurate when complete.

George
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06-08-2008 06:51 PM  12 years ago
Heli 770

rrProfessor

USA.

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RotorGeorge
What are you using to cut the cardboards with?
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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Scratch building a 1/4 scale Jetranger and Longranger
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