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Old Aug 02, 2007, 01:46 PM
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Scott_RC-TEK's Avatar
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The Offical SJM430 (500 Class/430mm Blades) Thread

************** Please see POST #1059 for updated info *************

================================================== ========
The new SJM500 has been born. You saw it here first.
Regards,
Scott

Weight: Approx. 1400g
Main gear: 125T M0.6
Motor: 1100KV
Motor gear: 13T,14T
Airframe Dimensions (no canopy): 760mm x 170mm x 260mm
Tail rotor diameter: 150mm
Tail rotor gear ratio: 1:4.8
Main rotor diameter: 870mm
Main shaft: 6mm x 175mm





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Old Aug 02, 2007, 02:02 PM
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Alexandria, VA
Joined Mar 2006
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Scott,

Good looking bird! I like the three bearings on the main shaft to keep it tight. I wonder how it will hold up on a hard skid landing with the motor exposed like that. You'll almost need a wrap around canopy like the MP-e with those landing skids!! Although it's almost too genuine to cover up.

I'm imagining this one with a some sort of v-staby device option and the option to get rid of the flybar.

I've subscribed to the post and am looking forward to hear more about this one and your other RCT 500 design!

Best of luck!
Paul
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Old Aug 02, 2007, 02:12 PM
Conformity Kill's
Mission Viejo, CA
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IMO they have just about everything right...the weight is at 3lbs, the gear ratio is where it needs to be....the only sucky thing is the 6mm main shaft...it really needs to be 8mm IMO...But we'll see....

when are they coming to market?

Geneween
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Old Aug 02, 2007, 02:29 PM
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Cape Town, South Africa
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Looks nice. Interesting MFS head design...

What length blades does it run front and back?

Can you post some closeup photos of the swash servo setup, and other main frame bits?
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Old Aug 02, 2007, 02:50 PM
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Looks sweet. More pics would be cool. Let the battle of the 500s begin lol.
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Old Aug 02, 2007, 03:45 PM
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If its the same as the smaller sjm ... you should be able to mount that motor on top... Can you confrim for us scott?
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Old Aug 02, 2007, 03:59 PM
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I asked this question at the 'other' forum so I guess I must bring it here now.
I noticed that the flybar is above the main blades on this heli. Most 'larger' helis, that I seen, have the flybar under mains. Mostly the 'smaller' helis, I have seen, have the flybar above the main blades. Would this factor into anything about this heli or it doesn't matter if the flybar is either above or below.

Thanks
Rich
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Old Aug 02, 2007, 04:22 PM
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Quote:
Originally Posted by blade strike
If its the same as the smaller sjm ... you should be able to mount that motor on top... Can you confrim for us scott?
I will post a few more shots shortly and get some more info after our next meeting with SJM engineering later tonight. The feedback recieved so far is appreciated.

Scott
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Old Aug 02, 2007, 04:25 PM
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Quote:
Originally Posted by SlowRide
I asked this question at the 'other' forum so I guess I must bring it here now.
I noticed that the flybar is above the main blades on this heli. Most 'larger' helis, that I seen, have the flybar under mains. Mostly the 'smaller' helis, I have seen, have the flybar above the main blades. Would this factor into anything about this heli or it doesn't matter if the flybar is either above or below.

Thanks
Rich
Rich, the floating upper flybar design in a heli this big should prove interesting as we have found the upper flybars can offer a better roll rate. Plus, this design is typical for the smaller SJM exotics and since this is a blown up version of the SJM400 PRO, it makes sense they are keeping things somewhat the same.

Scott-
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Old Aug 02, 2007, 05:29 PM
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Quote:
Originally Posted by SlowRide
I asked this question at the 'other' forum so I guess I must bring it here now.
I noticed that the flybar is above the main blades on this heli. Most 'larger' helis, that I seen, have the flybar under mains. Mostly the 'smaller' helis, I have seen, have the flybar above the main blades. Would this factor into anything about this heli or it doesn't matter if the flybar is either above or below.

Thanks
Rich

There are actually a few larger helis with overslung flybars, the Raptors 30-90, Helenseit 3dnt-3dmp, and some Logos.
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Old Aug 02, 2007, 05:41 PM
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Yes, this is true, but I am not aware of any that have floating upper flybar systems... Maybe someone can chime in if they know.
Scott
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Old Aug 02, 2007, 05:45 PM
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Tampa, Florida USA
Joined May 2007
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Thanks Scott for the reply. That is a very interesting head setup for sure. I'll keep my eye out for the future flight videos and the announcement of the 600 size of that heli.


tcfrum323, You notice I said "that I seen" and as you can tell, I haven't seen much.


Rich
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Old Aug 02, 2007, 05:48 PM
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Quote:
Originally Posted by geneween
IMO they have just about everything right...the weight is at 3lbs, the gear ratio is where it needs to be....the only sucky thing is the 6mm main shaft...it really needs to be 8mm IMO...But we'll see....

when are they coming to market?

Geneween
Hiya Gene,
Well, this was a question I had based on what you and I have discussed in the past privately, but due to the size of frame (or the lack thereof) and the low weight, they feel confident 6mm is good to go. I am going to get more clarification on a few topics tonight. We still need to help finalize the canopy design, which I will post in a sec.

Target release is in 3 weeks.

Regards,
Scott
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Old Aug 02, 2007, 05:55 PM
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OK, here is candidate #1 for the canopy. If anyone has canopy design experience and is also proficient in CAD design, we can talk about a mutually beneficial venture (hint hint)...
Scott-
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Old Aug 02, 2007, 06:17 PM
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Here are a few more shots of the top side and how easy it will be to stack popular lower cost 3S batteries.

Regards,
Scott



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