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HomeAircraftHelicopterAerial Photography and Video › GSR 260 Back (with mods)
02-09-2008 02:16 AM  10 years agoPost 1
KarbonBirdrrKey Veteran - Australia - My Posts: All  Forum  Topic

After a fair bit of running around and getting bits and pieces from all over the place to upgrade the GSR, the new machine took to the air again today and flew very nicely.

Some changes I have made to the stock outfit:

1. 800 mm NHP blades
2. Removed rear boom cover
3. Added Silphyde carbon tail fin
4. Added Silphyde double sided pitch slider
5. Upgraded fuel tank fitted
6. Voltage regulator for tail servo

02-09-2008 03:18 AM  10 years agoPost 2


Boulder County, CO

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Nice Man,
Glad to see you back in the air. The mods look sweet. Nice.
Does that carbon Sylphide tail fit right on the gsr tail? Or did you have to drill out new holes.. looks like you drilled a few of your own holes..

Also, Did you end up going with a carbon rod again? It looks like it, but I can't quite tell. The rod in the pic looks black so I was thinkin carbon.

So.. Have you got the bird dialed in? Spinnin at around 1500 rpm?

Must feel nice to get it going again. I am about to maiden mine soon.
You don't happen to have any preliminary throttle curves to look at?

Thats the last thing I need to program.. Throttle curves.. then my GSR is ready...

I can tell you I will be hovering real low at first and watching that tail.

Nice Job
Catch ya later

JR GSR260 - Mark IV Cam Mount
Trex 600NSP
Trex 600 to 700 Stretch
Trex 450SE
Hornet X3D

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02-09-2008 04:33 AM  10 years agoPost 3

rrKey Veteran


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The Silphyde tail requires a bracket to attach the fin to, which in turn fits onto the tail mechanism using 3 bolts. No additional holes were required.

I repaired the carbon rod using some brass tubing and my old friend JB Weld and it's as good as new. I had bought a metal rod for a GS but this proved to be too short so it was returned.

I estimate the RMP of the main blades to be about 1500 but my tach-opp was not available this morning to assist so I may try to check the settings tomorrow.

The pitch/throttle curve matter was discussed in an earlier thread of mine. A quick search should find it. Others here were reluctant to post their curves as I too had asked a few times for this information without success. I have posted my initial setting (also on an earlier thread) which will hopefully assist you. I wasted plenty of time trying to get the curves sorted out as I was simply looking for the correlation between the two to get me started.

Looking forward to seeing pics of your new machine. A video of the maiden would be really great too! Good luck.

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