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Old 08-29-2014, 03:33 PM   #21 (permalink)
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Main and tail blades on the real Jet Ranger III are symmetrical. Profile used for main blades is NACA 0012 mod (11,3%).

Small list of "old" and new airfoils used for rotor blades:


As you can see profile NACA 0012 (Jet Ranger III) belongs to the "old" airfoil club



Refering to the information I got from Jet Ranger III Pilots the tail is quite big problem,
blades are small and tail constantly needs attention. If the blades would be semisymetrical heli would be having more authority. I chose to have both main and tail blades semisymmetrical and I am glad I decided this way, why I will try to explain in next section.


My main rotor head from Flasher/Chaos kit like majority of the 600 size heads is having 12mm opening on the main grips. It is so hard to find blades beeing 680-700mm long with 12mm root, left rotating ( as on a real ship) CCW and semisymetrical.
Well the solution is http://derblattschmied.com/. Owner is a great guy, Kai if you read this thread, thanks again for your great support!

Profile for Helitec blades is semisymmetrical so the heli can have less positive and negative pitch. First test filght setting of the pitch was -5, 0 and +8 and RPM was 1300.



NEXT: Some more information about blades,...
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Old 08-29-2014, 03:58 PM   #22 (permalink)
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So some more information about main and tail blades. Below is a picture from the real JR III;




Helitec carbon blades are having great finish quality, they were superior balanced without any need of additional balancing and really are scale looking!



For the tail I have chosen brand SpinBlades since company produces semisymmetrical scale blades and I wanted to have tail with enought authority.

Main Rotor diammeter with 680mm blades is now 1505mm.



What was left for me to do is test flight with scale blades, flight was quite quickly finished since it started to rain;

Mechanics Trex 600 stretched to 700 size; scale blades from Helitec pitch settings (1 min 45 sec)


NEXT: Additional diagram of electronics wiring and positioning mechanics into fuselage,..
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Old 08-29-2014, 04:33 PM   #23 (permalink)
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I decided to add more detailed information about electronics wiring diagram if someone reading this thread will choose to use same electronics components for his/hers scale build. ( I have added higher resolution diagram picture if needed)



I just couldn't wait long not to put mechanics into fuselage it fits great;





My 2 years old son is getting so interested in helicopters, he wanted to sit into the fuselage




That is about where I am with the build at the moment, thinking of milion things considering fuselage scale look upgrading, also waiting for longer main shaft to arrive,... Until than or something new happening, have a great modeling time and good ideas to solve problems, wish you all cheers!
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Old 08-30-2014, 03:31 AM   #24 (permalink)
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This is going to be a stunning 206.
I am also looking for scale main blades, the site linked to in your earlier post seems to have what I want but everything is in German. Does he have an english site too?
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TREX 250 PRO,Talon15, GPRO, Zeal ----TREX 500 EFL PRO, GPRO, RAILS ----2x TREX 450PRO V2, 1xGPRO&1xBRAIN, Talon35, RAIL , Zeal ---- SAVOX powered TREX500 EFL in Roban scale UH1-N ---- TREX 600 EFL PRO, GPRO, RAILS ---- DX9 ----
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Old 08-30-2014, 04:12 AM   #25 (permalink)
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Allan Hi,

I shure hope so I will manage to add all the details humanly possible to the ROBAN Jet Ranger Fuselage.
Regarding blades everything on that web page is in German, but you can email Kai use email: [email protected] and you can write to him in English, he will reply to you in English also Paypal payment is possible.

Take care, Peter
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Old 08-30-2014, 05:42 AM   #26 (permalink)
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Ok thank Peter, I will mail him. My German is limited to Gutentag.
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TREX 250 PRO,Talon15, GPRO, Zeal ----TREX 500 EFL PRO, GPRO, RAILS ----2x TREX 450PRO V2, 1xGPRO&1xBRAIN, Talon35, RAIL , Zeal ---- SAVOX powered TREX500 EFL in Roban scale UH1-N ---- TREX 600 EFL PRO, GPRO, RAILS ---- DX9 ----
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Old 08-30-2014, 07:10 AM   #27 (permalink)
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Peter,

That's a pretty 700 size Jetranger you are building....thanks for the technical data and information on real size blades.

Roban does this fuselage? but i didn't see any in their website-product lists.

Seems almost everyone is using the TR-600ESP or its clone chassis for scale birds now..include myself.

One advantage is that the T-600 chassis allows more room for front cockpit detail.

A friend of mine uses a TR-700E for this same Jetranger but the front chassis didn't gives enough room for the pilot seats to install properly!

The rotor head/grips looks to be similar in size with TR-700 class.

Nice to know there are so many Bell models being build now..

Cheers,
George
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Old 08-30-2014, 09:06 AM   #28 (permalink)
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George hi,

I was also surprised to see ROBAN is manufacturer, users manual was branded ROBAN. I bought it at www.scaleflying.de Regarding mechanics new 600 ESP is hard to get and frames are needing trimming for motor I was planning to use. So I have decided to go with Chaos mechanics but received Flasher instead. Difference between those two "brands" is that with Flasher I was missing third bearing block, even hols were made in frames. The main rotor head is more alike 700 size. The quality of the parts with Flasher is so so that is why I choose to change them for ALIGN brand. I just can't afford fail when flying scale ship.





Today it was a great day to make some aditional testing of settings. I am still not 100% satisfied with the outcome when flying with positive pitch,..




Here is a video,.. [ame]http://youtu.be/ZAadzwcpvLA[/ame]

Cheers
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Old 08-30-2014, 06:13 PM   #29 (permalink)
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Peter:

What outcome are you looking for? Hovering around like that does not show much of what a set of blades or pitch settings can or can't do. You have said you have 8 degrees of pitch but you have not mentioned cyclic pitch. How many degrees of pitch do your blades have in forward/reverse and left/right motion?

On my small fleet, I am generally running about 7.5 degrees of cyclic and from -4.5 degrees to +11.5 degrees of pitch. My Jet Ranger runs about 1450rpm but uses symmetrical blades. I have not tried semi-symmetrical blades on it and may never do so but maybe one day I might give them a go just to try them and see what performance gain might be there. Both my AS350 and 500MD TD use semi-symmetrical blades but from different manufacturers. The AS350 turns the Rotor Tech 600mm blades at 1425rpm and the 500MD TD turns the Spin Blades 600mm blades at 1475rpm. I am thinking about cutting down the cyclic throw to around 6 degrees as it will help to calm down the speed I am getting. My 500 can become a bullet really quick, lol. Take care.

Don
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Old 08-31-2014, 01:21 AM   #30 (permalink)
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Don hi,

I do not have the problem with cyclic it is on 8 degrees. Generaly mechanics is flying Ok. I am looking for a specific feeling so now I am playing with pitch that will be -3 on minimum and +12 degrees on maximum. I do not think more than 12 degrees would be needed to be as I expect it to be. Let's say fine tuning is set in motion, heli will fly good also without it but hack I am a scale heli nerd



Peter
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Old 09-01-2014, 07:46 AM   #31 (permalink)
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Well guys,

I just couldn't wait any longer, longer main shaft to arrive. I have installed mechanics into the fuselage and made openings for the tail and add vertical stabilizer.



On real Jet ranger vertical stabilizer leading edge is turned a few degrees to the right to helps the tail .




Vertical stabilizer is attached with four screws to the body so mine scale Ranger will have same solution.



Opening for tail mechanics is roughly done, trimming will be done later.

,...to be continued
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Old 09-01-2014, 07:53 AM   #32 (permalink)
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So here it is Vertical stabilizer. Helicopter just gets it's known form when adding it.

From the right side:


From the left side:


And complete:




,... till next time enjoy
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Old 09-07-2014, 11:00 AM   #33 (permalink)
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So today it was the "D-day"!

Mechanics and fuselage, the maiden flight. All was smooth, unfortunately my daugher that usually takes video was on the visit at her grandparents, so only two still pictures taken.




I was a bit worried how the tail will respond, but there was no need to worry all was smooth like a silk. I liked when finished maiden the blades just keep spinning as on a real heli, great thing to see



So next are going to be fuselage details, there is so many things to do,...
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Old 09-08-2014, 05:40 AM   #34 (permalink)
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Hi Peter,
you have a nice build going and I am sure this will be a very good looking Ranger when it's done.

looking forward to the rest of your build!

take care!
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Old 09-08-2014, 10:02 AM   #35 (permalink)
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Roy thanks for your kind words. I will try to make this Jet Ranger III as scale as possible with a theory involved when considering real one.


Peter
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Old 09-20-2014, 05:36 PM   #36 (permalink)
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Ok so it was about time I start adressing the fuselage. As first I have started with DogHouse.

This is how it looks on real one:


Nothin special you might say, well yes but ROBAN fuselage is having quite
few distorsions from a real one,..



First I needed to close the hole in the second part of the Doghouse, since real one is not having so big hole there.


Well Polystyrol, epoxy and fine fabric made the hole disappear.



After filling the hole, new holes that were missing needed to be done


,....
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Old 09-20-2014, 05:46 PM   #37 (permalink)
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So motor holes cooling system is done, let's move on to the engine oil cooler .




For the engine oil cooler I had some trubles since below where engine oil cooler sits I have a tail servo being quite neer the cooler so I need to improvize.




Polystyrol and coppered vitroplast were my working material.


For fixation inside fuselage I have used Epoxy and fine fabric.




Polystyrol is used to make stripes inside of engine oil cooler. After fuselage is going to get painted
I will add black foam between the oil cooler ribbs.


,....
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SAB GOBLIN 700, Vbar,YGE 120HV,ALIGN MX750, Gryphon BEC
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Old 09-20-2014, 05:51 PM   #38 (permalink)
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The engine oil cooler turned out quite realistic.


I just couldn't wait I need to see how it looks on fuselage,...





That is all for now,... to be continued
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SAB GOBLIN 700, Vbar,YGE 120HV,ALIGN MX750, Gryphon BEC
Scale JET RANGER III 700 size with Flasher 600 mechanics under developement,
Futaba Transmitter T14SG !

Last edited by Xsiluro; 09-21-2014 at 12:03 AM..
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Old 09-20-2014, 08:31 PM   #39 (permalink)
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Very nice work..To be technically correct it's not a filter but the engine oil cooler..keep up the good work.
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Old 09-21-2014, 12:03 AM   #40 (permalink)
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Stabes70 thanks for nice words and for technically correcting me it is engine oil cooler and not a filter.I did corrected the posts accordingly, thanks again.

Peter
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