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Top RC Zero from Gator R/C

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Old 10-30-2017, 12:16 PM
  #501
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Report: Flying Sunday with cowl mods went well. Saito FG 84 and Keleo exhaust ran cool in the air with average temps around 177f. Ran two flights without pressure fittings. Everything seemed fine. Still tweaking midrange.
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Old 10-31-2017, 04:00 AM
  #502
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Quote:
Originally Posted by jimkron View Post
Report: Flying Sunday with cowl mods went well. Saito FG 84 and Keleo exhaust ran cool in the air with average temps around 177f. Ran two flights without pressure fittings. Everything seemed fine. Still tweaking midrange.
Jim, Good to hear you are conquering the heat problem. I have a couple questions.
1. Did you notice the temp when the engine died from over heating?
2. What effects do you think pressurizing the fuel tank did or didn't do?
3. Are you running the Ray English recommended 15.1 mix? And what kind of lube are you using?
Thanks,
Gary
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Old 10-31-2017, 06:38 AM
  #503
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Originally Posted by redjack View Post
Jim, Good to hear you are conquering the heat problem. I have a couple questions.
1. Did you notice the temp when the engine died from over heating?
2. What effects do you think pressurizing the fuel tank did or didn't do?
3. Are you running the Ray English recommended 15.1 mix? And what kind of lube are you using?
Thanks,
Gary
1. Just a guess...very hot...230f+ in the air. Deadsticks did not have telemetry.
2. Honestly, very little that we could tell after two flights.
3. Yes 15:1. Using 95 octane non-ethanol gas Sunoco Optima. Oil is Morgan synthetic. https://www.horizonhobby.com/hp-lubr...-oil-qt-coo500
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Old 11-01-2017, 06:24 AM
  #504
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Quote:
Originally Posted by jimkron View Post
1. Just a guess...very hot...230f+ in the air. Deadsticks did not have telemetry.
2. Honestly, very little that we could tell after two flights.
3. Yes 15:1. Using 95 octane non-ethanol gas Sunoco Optima. Oil is Morgan synthetic. https://www.horizonhobby.com/hp-lubr...-oil-qt-coo500
Jim,

I just stumbled across this thread. Be careful with that oil. I exploded (broken rods) with 2 Ray modified 84cc on that oil.Name:  p.jpg
Views: 277
Size:  3.1 KB

We didn't depart on good terms especially when he question what oil I was using when I returned the second broken one to him..He pretty much called me a liar.

I now a have the stock 84cc living in a topflite fw-190 that has similar cowl airflow issues if not worse that the Zero. I am using the baffles also with on a one hole in the bottom.

I am using redline oil but I have witness the stock motors with over 100 flights using klotz also.

I have figured out the way to make any of them live is the right oil and running rich. I believe the Ray mod allows all cylinders to fire at a much leaner setting but that takes away the lubrication to the rods and internals.

My needles are at 4.5 and 6.5 high side..It will not start and run if I lean either one. I get temps under 200 after a 10 min hard flight in 90 degree weather. I tuned mine using a infrared temp gun with the cowl off. It will cool down going to full throttle..

I have burned at least 10+ gallons thru mine and not a single problem. If you haven't seen the video I also run the 24x12 prop like you and my Telemetry shows it turning over 7600 rpm in the air. Ray told me that the engine wouldn't live pass 6400 rpm. You be the judge for your self. I love the video and the sound of your zero.
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Old 11-01-2017, 06:25 AM
  #505
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Oh yea I don't chase down the that expensive non-alcohol gas just for this engine.. that is a joke..
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Old 11-01-2017, 06:32 AM
  #506
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Here is mine last fall and will be flying it this weekend in Ga. at a warbird event
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Old 11-01-2017, 06:53 AM
  #507
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I really wish I could get up there for that
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Old 11-01-2017, 06:54 AM
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I really wish I could get up there for that
Yea Rex and Pedro put on a great event.. Love the Friday night steak
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Old 11-01-2017, 07:39 AM
  #509
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Hey Jeff,
How did you hook up the RPM telemetry for the Saito. I've got the little cable wrapped around the cylinder for temp but not sure how to connect to engine for RPM.
Thanks,
jim
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Old 11-01-2017, 07:51 AM
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Jim,

I pretty sure I used this with my tach lead from the ignition box.
https://www.horizonhobby.com/ignitio...dapter-evoa107

I see that it has been discontinued. It works just fine and I have the onboard tach to check it against.

Jeff
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Old 11-02-2017, 06:25 AM
  #511
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I received my Zero today & made a start on the wings. After removing the servo hatches, I see that there are no wood mounts fitted to the wings to attach the servos. Did any of you guys have this issue? Perhaps it is a change of design?
I thought about drilling the servo hatches & bolting the servo L brackets to the hatches, or do you think I should make some mounts & epoxy them to the wings?
I am very pleased with the quality of this model.
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Old 11-04-2017, 09:23 PM
  #512
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I decided to fit the servos, with the metal L brackets to the servo hatches. It seems to be very secure.
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Old 11-05-2017, 10:02 PM
  #513
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Quote:
Originally Posted by jws_aces View Post
Jim,

I pretty sure I used this with my tach lead from the ignition box.
https://www.horizonhobby.com/ignitio...dapter-evoa107

I see that it has been discontinued. It works just fine and I have the onboard tach to check it against.

Jeff
Hey Jeff,
This looks like the replacement or upgrade.
https://www.horizonhobby.com/evoluti...dapter-evoa113

I'm attaching to tach lead on ignition box for Saito FG 84. Will test this weekend with DX18 and 20 channel spektrum receiver with built in telemetry. Is this plug and play or do I have to fiddle with the RPM settings in transmitter?

Thanks,
jim
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Old 11-06-2017, 04:51 AM
  #514
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Jim,

It's a plug and play, just go into telemetry and select RPM as one of the displays should show up once you do that. Flew mine again in GA at the GMARC Dino war bird event and we watch the display in flight. Saw 7630rpm. love that sound ..
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Old 11-06-2017, 05:32 AM
  #515
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Quote:
Originally Posted by Jim Cattanach View Post
I decided to fit the servos, with the metal L brackets to the servo hatches. It seems to be very secure.
That's the old style, similar to what is provided on many Jets. It's not an issue if you have electric power or a smooth twin. I wouldn't do it will a gas engine that vibrates much, I don't think there is a way to mount the aluminum L brackets and keep the rubber mounts on the servos.
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Old 11-06-2017, 07:47 AM
  #516
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Quote:
Originally Posted by jws_aces View Post
Jim,

It's a plug and play, just go into telemetry and select RPM as one of the displays should show up once you do that. Flew mine again in GA at the GMARC Dino war bird event and we watch the display in flight. Saw 7630rpm. love that sound ..
Jeff,
Wow. 7630 rpm. We're tuning my Saito on the ground to 5800. Figuring the prop will unload to 6500-+ in the air. Your FW must have been screaming!

jim
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Old 11-06-2017, 08:08 AM
  #517
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Originally Posted by jimkron View Post
Jeff,
Wow. 7630 rpm. We're tuning my Saito on the ground to 5800. Figuring the prop will unload to 6500-+ in the air. Your FW must have been screaming!

jim
Yea there was another guy there with the exact same plane and set up.. using the 24x12 zoar prop. we had a blast flying together. He seem to be turning really similar rpms.
Jeff
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Old 11-06-2017, 03:20 PM
  #518
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Quote:
Originally Posted by Jim Cattanach View Post
I decided to fit the servos, with the metal L brackets to the servo hatches. It seems to be very secure.
Go to your local hardware store and get 3.5x10mm screws. That will allow you to use the rubber grommets. I mounted mine without the wood blocks and straight to the hatch.. Just one less place to have a failure.
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Old 11-07-2017, 09:19 AM
  #519
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Quote:
Originally Posted by TimD. View Post
Go to your local hardware store and get 3.5x10mm screws. That will allow you to use the rubber grommets. I mounted mine without the wood blocks and straight to the hatch.. Just one less place to have a failure.
I did not use the rubber servo grommets. I am using a Saito FG 84 I had in a giant Corsair. Had no vibration issues.
The build is going well. Both wing halves are finished.
I bought the kit from Bigplanes in the Netherlands & they supplied electric ESM landing gear. The gear doors were easy to set up using this gear.
Starting on the fuz tomorrow.
I am not a fan of wires for rudder & will use the servo hatch in the tail fin method.
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Old 11-13-2017, 04:45 PM
  #520
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Gator Zero arrived Saturday
Considering Saito 90 cc Three cylinder Engine
But have read some post that overheating and engine stopping with dead stick landing
At about 4 or 5 $ thousand this is a no no
Just completing 100 ' Douglas dive bomber and still waiting for Some radio parts for Hanger nine Corsair
7-77 in Corsair 9-99 in Douglas
My son and I are going to war with SBD attached zero and shot down ( Not really Smoke maker on zero)
by Corsair
Well I am 85 and my sons are 60 & 57
Some people fortunately never grow up
Any advise on over heating would appreciated
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Old 11-14-2017, 08:07 AM
  #521
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The cowl ring and keleo exhaust block air from exiting...in my opinion. I'm confident we solved the over-heating by opening up the back of the cowl flaps, baffled the engine, and got rid of cowl mounting ring. This is not an exact science...but a start.
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