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08-29-2013 04:14 PM  5 years agoPost 1
dcbusdriver

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Stephens City,VA -USA

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I am going to do my first scale build for a friend of mine that bought a Century Bell 222 550 size heli. He is planning to run a 4 blade rotor head on it from RC Aerodyne. I am wondering what kind of pitch curve to run on a scale heli as I'm a 3D guy and used to +/- 12 degrees pitch and linear pitch curve. Is there a "standard" scale setup that is used for scale flying that gives less sensitive hover performance and realistic flight characteristics?
Thanks for any tips, advice or links to good scale forum!

beating the air into submission...........cool!

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08-29-2013 05:25 PM  5 years agoPost 2
garyl

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taxachussetts

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-2 to +10 on a linear curve should work fine. As a rule the less total pitch you have the less sensitive the collective pitch will be.

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08-29-2013 07:03 PM  5 years agoPost 3
dcbusdriver

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Stephens City,VA -USA

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Thanks, that sounds good.

beating the air into submission...........cool!

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08-30-2013 01:49 AM  5 years agoPost 4
Keygrigger

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Mississauga, Ont. Canada

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Just a point of information but is your friend aware that a Bell 222 is a two blade helicopter and not a four blade? I am aware that it could be for the "cool looking" factor and not for scale.

Don

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08-30-2013 01:59 AM  5 years agoPost 5
MDSCUSTOMS

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North Wales, U.K.

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A 4 bladed version of the 222 does exist but it is known as the Bell 430 - it is a stretched version of the 230 which was in turn developed from the 222.

Very similar in appearance apart from the doghouse on top - slightly different shape and the engine exhausts are in a totally different position to those on the 222.

Mark

I'm only here coz I'm not all there !!

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08-30-2013 03:19 AM  5 years agoPost 6
Keygrigger

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Mississauga, Ont. Canada

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Yes, I knew about the 430 but it is not a 222, which was the chosen model. Looking at a set of line drawings shows that not only is it stretched, but the doghouse is nearly half again as big as the original 222. I spotted a side by side comparison picture set of the two through Google and, unfortunately, they are not even close, sad to say. A four blade head on a model 222 is just for fun but not a scale representation of an existing full size helicopter. Take care.

Don

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08-30-2013 03:32 AM  5 years agoPost 7
Keygrigger

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Mississauga, Ont. Canada

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On the Airwolf that I am finally finishing this week, I am using a Normal pitch curve of 0, 5.5, 11. Idle 1 and 2 are set to -4, 5.5, and 11. There are some careful intersections of the mid points of those settings so that as I spool up and switch to Idle 1 or 2, there is not perceptible change in the rotor pitch and at all times during the spool-up, the model has positive pitch. Hope this helps.

Don

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08-30-2013 03:34 AM  5 years agoPost 8
MDSCUSTOMS

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North Wales, U.K.

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Have fun however you build your 222 - I'm in the process of building a 222 UT (Skid version) with a scale flybarless head. Looking forwards to getting it completed now.

Mark

I'm only here coz I'm not all there !!

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08-30-2013 06:27 AM  5 years agoPost 9
dcbusdriver

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Stephens City,VA -USA

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Thanks for all the input guys. Yeah, he's going for "cool" factor with the head. We'll see if he decides to build another and go for the all scale look later on. I'll try and document the build and post some pics later down the road. Thanks again

beating the air into submission...........cool!

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08-30-2013 06:31 AM  5 years agoPost 10
dcbusdriver

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Stephens City,VA -USA

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Also, I meant to ask if you might have a link to the scale fbl head you used on your 222 build MDS?

beating the air into submission...........cool!

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08-31-2013 04:45 AM  5 years agoPost 11
MDSCUSTOMS

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North Wales, U.K.

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Hi,

No direct link to the head I used on mine as it is one that I modified myself to this spec. The head is one from a Kalt Baron 20 which also featured a flybar on a separate pivot tower above the main head.

To do the modification, I cut the flybar pivot tower off and had to use the swash assembly from a slightly later Kalt Baron 20MX to allow proper operation. I also had to make a couple of new linkage rods for the new head. The finished result is very simple, very functional and virtually identical to the real thing.

This is on a 30 size machine using an 8mm mainshaft. I do believe all 50 size Heli's now use a 10mm mainshaft.

The good news is that Kalt also made the Baron 50 and the Baron 60. The Baron 50 also used the same head as the Baron 20 although slightly larger, so this will be the one to fit yours, assuming you have a 10mm mainshaft. You should be able to find one of these on Craigslist or ebay in the states quite easily as they were a popular machine over there and they still come up quite a lot. (Don't go for the Kalt Baron 60 head as this is totally different)

If you have a swash set up suitable for flybarless heads then you could use this with your existing swash. Now the Ironic bit - The Kalt baron 60 swash setup is perfect for the modified head (never really understood why they never made this themselves, had they been in the game a bit longer then no doubt this would have appeared)

The pics below show my original head before modification with the flybar pivot tower still attached - black tape marking the cut line. 2nd pic shows the head after the cut. Head was cleaned up after this and bearings lightly oiled.

Hope this helps

Mark

I'm only here coz I'm not all there !!

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09-01-2013 12:05 AM  5 years agoPost 12
dcbusdriver

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Stephens City,VA -USA

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Wow, nice work! Thanks for the info.

beating the air into submission...........cool!

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