CY Model P-51D Mustang 2.4M - 85cc
11-21-2017, 06:16 AM
#76
Thread Starter
With the engine mounted I turned my attention to the pipes and had to go 'full eyeball' 
to try and get the correct pipe placement. What I am trying for here is to make sure that if I am unfortunate enough to bring her down skimming the nose a bit I don't want the pipes pointing straight down, as they could at best loosen off and at worse send dirt up in to the engine or crack the heads. So the pipes are kicked out to the side slightly. I've seen some guys build a collector system and run the exhaust out of the scale exhaust holes. That's a little bit more skill/technique than what I have available, besides which I am suspicious that this would create more in cowl heat and possibly also backpressure on the exhaust that might lead to tuning issues. I am looking to keep this as simple as possible - even if everyone at the field will need ear muffs
I'm using a wide voltage servo on the throttle. I noticed it gets pretty hot running on 2s lipo. It might be getting switched out soon for a HV unit, watch this space...
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to try and get the correct pipe placement. What I am trying for here is to make sure that if I am unfortunate enough to bring her down skimming the nose a bit I don't want the pipes pointing straight down, as they could at best loosen off and at worse send dirt up in to the engine or crack the heads. So the pipes are kicked out to the side slightly. I've seen some guys build a collector system and run the exhaust out of the scale exhaust holes. That's a little bit more skill/technique than what I have available, besides which I am suspicious that this would create more in cowl heat and possibly also backpressure on the exhaust that might lead to tuning issues. I am looking to keep this as simple as possible - even if everyone at the field will need ear muffs I'm using a wide voltage servo on the throttle. I noticed it gets pretty hot running on 2s lipo. It might be getting switched out soon for a HV unit, watch this space...
.
11-21-2017, 08:52 AM
#77
Thread Starter
After mounting the Roto I measured out the pipes. The rear pipe is fine and did not need any adjustment, the front pipe I landed up cutting by about 50% !! looked a bit aggresive but when the cowl goes on it just looks 'right'. So lets see how that goes. Next on the list is work on the ignition... Powerbox recommend dual spark switch so a single switch does not overheat....
Route for ignition leads
While I was working in the area I decided to gap check the valves - Roto recommends this after 3 hours of running.
Plug leads in place but still some tidy up to be done...
Route for ignition leads
While I was working in the area I decided to gap check the valves - Roto recommends this after 3 hours of running.
Plug leads in place but still some tidy up to be done...
12-22-2017, 07:05 AM
#78
Thread Starter
Some updates on the P51.... due to the scoop underneath she is a difficult model to store so I broke out the table saw, some 9mm MDF and made up a storage frame. Sprayed Matt black and foam fitted. Next was precision drilling the Top RC spinner backplate with a drill press for the prop bolts. So far so good but I might look at trying to colour match the cowl red to the spinner and paint the exhausts to look a bit more realistic...
01-03-2018, 03:50 AM
#79
Thread Starter
The CY P51 kit comes with part of the belly scoop separated and in the instructions they just show it being glued on. I’m happy to keep it simple but wanted to at least block up the inlet as it looked too much like a parachute.I toyed with the idea of trying to use the air feed to do something with but do not have any type of heat exchanger on board so the Meredith effect will not apply.So I just cut out a top section that will be covered anyway, painted it satin black and glued it home.
04-04-2018, 06:53 AM
#81
Thread Starter
The tail wheel assembly with the kit is very basic, not retracting and no real instruction on how to make anything work. They did at least supply a covering door in the right colours so I set about making up something custom. This involved cutting off a section to make removable, setting up a servo shelf, doing some reinforcing and glue work.
I am using Tamjets hinges for the doors here.
I am using Tamjets hinges for the doors here.
04-04-2018, 06:56 AM
#82
Thread Starter
Taking a small diversion I am making up an exhaust bung system to stop oil drips dropping in to the car or house while storing. I ordered some silicon bungs from ebay and used a few spare parts from an old Mutliplex twinjet to make up something appropriate..
I also made one of the exhaust stacks removable so that I can do carby tuning etc at the field without having to remove the cowl (hopefully!)
I also made one of the exhaust stacks removable so that I can do carby tuning etc at the field without having to remove the cowl (hopefully!)
04-04-2018, 06:59 AM
#83
Thread Starter
I am wrapping the exhaust pipes to try and minimise heat soak through the cowl
also fitting some in and out vents on the bottom of the cowl to keep the heads cool
and customised some hitec metal arms and installed a hirobo ball link system for the doors.
I've also been busy doing some wiring tidy and prepping the battery tray. If the weather is OK on Saturday I hope to do some ground run up tests!
also fitting some in and out vents on the bottom of the cowl to keep the heads cool
and customised some hitec metal arms and installed a hirobo ball link system for the doors.
I've also been busy doing some wiring tidy and prepping the battery tray. If the weather is OK on Saturday I hope to do some ground run up tests!
08-20-2018, 06:29 AM
#84
Hello, do you know the angle for the main retracts? is it a 90 degree? I do have the CY Model struts and I would like to order the Electron mains only like what you did.
01-24-2019, 04:22 AM
#86
My Feedback: (48)
I no longer have the airplane. Mine was basically a upgraded CY Mustang put out by Flying Models.
My eyes have issues and after surgery I started selling off all my faster warbirds. It was a good flyer for me but for whatever reasons it was not a good flyer to the individualI I sold it to. He apparently had a bad landing which did a lot of damage and was very unhappy with it. Hated to hear that but have no idea how he set it up either. I believe them to be good flyers and was very happy with the quality of mine. I set mine up pretty much with same cg and throws as the Ziroli as the CY is a very close copy of his design.
My eyes have issues and after surgery I started selling off all my faster warbirds. It was a good flyer for me but for whatever reasons it was not a good flyer to the individualI I sold it to. He apparently had a bad landing which did a lot of damage and was very unhappy with it. Hated to hear that but have no idea how he set it up either. I believe them to be good flyers and was very happy with the quality of mine. I set mine up pretty much with same cg and throws as the Ziroli as the CY is a very close copy of his design.
08-26-2021, 12:03 PM
#92
Join Date: May 2014
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so for those who flew this plane any advice for a recent purchase of a used one with roto motor 130 3 cyl.. i will need to setup my spektrum power safe system and advice on cg point and throws for surfaces welcome.. also any elevator mix for full flaps on landings.................i hope to make a nice maiden with your advice.
