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Top RC Zero from Gator R/C

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Top RC Zero from Gator R/C

Old 03-19-2022, 10:29 AM
  #1026  
Jaketab
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It's been done 100 or more times but routing the plug wires, so they don't make contact with the Keleo exhaust ring seems to be a problem.
Does anyone have a picture or illustration of how it's done?
Thanks - J Tab
Old 03-19-2022, 11:13 AM
  #1027  
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Originally Posted by Jaketab View Post
It's been done 100 or more times but routing the plug wires, so they don't make contact with the Keleo exhaust ring seems to be a problem.
Does anyone have a picture or illustration of how it's done?
Thanks - J Tab
Inside the ring, if its a concern, wrap the closest section of the lead with HVAC alu
aluminum tape, to reflect the heat away from the lead. Those spark plug leads are the same material as the plug wires on your car, alone they should resist heat pretty well, but a little insurance never hurts.
Old 03-24-2022, 07:36 PM
  #1028  
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My Zero is almost ready to maiden. I had it fully assembled tonight and took measurements required for a manual calculation to determine the CG. If the plane (estimating) weights 32lbs (28lbs on the front mains and 4lbs on the tail wheel) the plane will require (1.82lbs or 826.4 grams) over the engine to balance at 145 mm CG.
In the next day or two I will weigh the plane on the Xicoy CG balancer and post the results.

Question - Is 826 grams the approximate amount of weight required to balance - with the Saito FG90R?

Regards - J Tab
Old 03-25-2022, 01:32 AM
  #1029  
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Jake , mine took several pounds more than that ,but my weight was placed as far forward in the engine Box as possible , but not over the engine . I used a Vanessa rig to balance mine . It flies perfectly fine the weight needed to balance on the factory published CG .
Old 03-25-2022, 04:54 PM
  #1030  
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According to the Xicoy CG Balancer, 2.68 lbs. is required around the engine to balance at the 145 mm mark. The CG as the plane sits now is at 170 mm. The plane is 30.75 lbs. before adding nose weight.






Old 03-31-2022, 03:44 PM
  #1031  
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Added lead today bolted to the baffles and on bottom of motor box. Final weight / CG numbers are as follows:
Weight/CG before: 30.76lb / 169.3 mm
Weight / CG after: 32.61lb / 152.02 mm
Total weight added: 1.85lb.
Approximately 5.5 oz of lead is bolted to each of the 3 baffles. Hoping the weight does not stress the 1/8" aluminum angle brackets.



Old 04-01-2022, 12:18 AM
  #1032  
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Nice work, Jake..
Old 04-24-2022, 07:20 AM
  #1033  
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Some notes yesterday on the first 4 flights on my Top RC Zero with the FG90. The first flight was tail heavy but still very manageable. Landing this plane was easy by keeping a little throttle until the end. I added another 2 1/4 oz weight around the engine and the plane was much better for the remaining 3 flights. I estimate the total weight added is now just over 2 lbs. For straight and level flight the plane requires slight down elevator to be neutral.
On flight #3 the wind caught me down-wind and I had 2 aborted landings. The engine with the Biela 23 x 10 3-blade had good reserve to pull out and go around again.
In flight temperature. The engine is well baffled, but I have not opened the cowl flaps yet. It performed very well (no sagging) with the Biela 23 x 10 3-blade. When running extended full throttle, the temps would climb just above 250F on #1. Backing off the throttle would lower the temps to the 235 - 240F range. Hope some of you will post your in-flight temps for comparison.

Thanks - J Tab
Old 04-24-2022, 12:16 PM
  #1034  
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Originally Posted by Jaketab View Post
The engine with the Biela 23 x 10 3-blade had good reserve to pull out and go around again.
In flight temperature. The engine is well baffled, but I have not opened the cowl flaps yet. It performed very well (no sagging) with the Biela 23 x 10 3-blade. When running extended full throttle, the temps would climb just above 250F on #1. Backing off the throttle would lower the temps to the 235 - 240F range. Hope some of you will post your in-flight temps for comparison.

Thanks - J Tab
Hello.
In my point of view 10” pitch is a little to small. I can understand you have to fly full power all the time. We have a couple of warbirds in this size at our club and we did some experiments with props. Best is to use a pitch of around 14”. I only go to full power when I want to fly a big loop with my Zero/FG90. 90% of the time is partial power. Great speed, great sound at part power and the engine runs happy.
My prop is a Ramoser 22,7” 3 blade with a pitch adjusted around 14~15”. Temps are around 230-240.



Old 04-24-2022, 09:06 PM
  #1035  
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To add on. You might best be served going ahead and ordering a varioprop from ramoser. On a gas engine in maxes at 6400 rpm. So, you would tune pitch to maintain that at WOT in flight.

Might be surprised how much pitch you actually end up running.


this beast is a performance unlimimited products modified G62 rated at 7.2 hp at 8000 rpm. The prop is a 4 blade 23.6 inch varioprop. Estimates have me starting prop tuning at 14 inches of pitch. The nice thing...I just had to buy one prop.
Old 04-29-2022, 09:58 PM
  #1036  
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Originally Posted by Didier View Post
My yesterday's flight with the Zero.

https://youtu.be/mimEOBOCCIQ
The presentation of both low and high speed flight was a masterpiece. You placed yourself ahead of the plane and each maneuver was executed within the box. It is always a pleasure to watch when the air frame and pilot become intertwined.
Old 04-30-2022, 12:08 PM
  #1037  
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Opening cowl flaps. I slit the flaps along the horizontal seams, but they do not bend outward due to the radius. In order to open the flaps, it appears they need to be cut out completely and reinstalled ?
What method are others using to open up the cowl flaps on the TRC Zero ?

Thanks and regards - J Tab
Old 04-30-2022, 12:17 PM
  #1038  
flycatch
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operational cowl flaps made easy
Old 04-30-2022, 02:39 PM
  #1039  
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Good find - Thanks
Old 05-01-2022, 01:24 AM
  #1040  
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Originally Posted by flycatch View Post
The presentation of both low and high speed flight was a masterpiece. You placed yourself ahead of the plane and each maneuver was executed within the box. It is always a pleasure to watch when the air frame and pilot become intertwined.
Thanks for the compliment. The Zero is enjoyable to fly.
Old 05-28-2022, 01:48 AM
  #1041  
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Originally Posted by Jaketab View Post
Opening cowl flaps. I slit the flaps along the horizontal seams, but they do not bend outward due to the radius. In order to open the flaps, it appears they need to be cut out completely and reinstalled ?
What method are others using to open up the cowl flaps on the TRC Zero ?

Thanks and regards - J Tab
This is what I did on mine. I can bend the Ali to open them or close the, up if I want. Don’t need to bother with in flight adjustment on this model… too small to fit the servos in to do this.




Old 05-28-2022, 05:56 AM
  #1042  
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This is what I did on mine. I can bend the Ali to open them or close the, up if I want. Don’t need to bother with in flight adjustment on this model… too small to fit the servos in to do this.


Excellent solution, thanks.
What method did you use to make the nice clean straight cuts?
Old 06-02-2022, 03:06 AM
  #1043  
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Originally Posted by Jaketab View Post

Excellent solution, thanks.
What method did you use to make the nice clean straight cuts?
Hi Jake, I just used a fine diamond cut off wheel in a dremel and a steady hand.

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