|May 25, 2013, 10:45 AM|
Lets talk about appropriate RADIAL model engines for the Wurger.
I have procured a lightly used FA450R3D for my Shrike. In the present configuartion, the big Saito triple requires a set-back of @ least 1/4" to align properly W/the end of the cowl. Since I'm going to use the SiST cooling fan/spinner combination on my plane, this is particularly important. I was going to set-back the firewall to accomplish this.
I had decided to do an FW190A5 Graf color scheme.
When doing research it dawned on me that to be correct, I needed to extend the nose @ least 1 3/16".
That's when I had my own epiphany!
If I extend the nose, that solves my set-back problem. I can extend the nose the proper amount for a scale appearance & add shims behind the engine mount to fine tune the fan placement in the cowl opening.
Furthermore, W/over 6# of Saito radial hanging another 1" forward, CG adjustment might not require any added ballast. That's my next project, hanging the engine on the existing fiewall W/3/4" standoff.
|May 26, 2013, 05:24 PM|
Butchering the Butcher Bird
Since I am mounting a high compression, spark ignited, nitro burning 4-stroke radial & planning on spinning a near scale sized 3-blade prop, cooling will be a priority.
As I said previously, the Saito 450R3D is @ least 1/4" too long so it dawned on me that if I modeled an A-5 variant, I could extend the nose almost 1 1/4" for a scale proportion. I can get 7/8" standoffs from Horizon so that brings me pretty close to where I want to be.
So anyway I had to cut away the fake exhaust stacks. I am going to use whatever diameter of semi flattened aluminum tibe that will simulate the scale exhuast yet allow air passage. That also opened up a "chamber" behind the fake cooling louvers.
I can box in that chamber, cut some holes in the fuselage former & I'm debating whether to just try to open up the fiberglass louvers or make a casting off them & make me a little stamping die for a 2X strike in some .020" aluminum sheet. I'm leaning towards aluminum as I think it will hold up better than the thin fiberglass.
In this frontal view you can see if I bevel the rear edge there is just enough meat left in the fuselage former next to the motor box to cut some slotted holes.
Since all that neads to protrude from the cowl will be the collector ring exuast outlet @ the bottom, I'm trying to use the scale cooling fan & baffling W/effecient outlets to keep the big triple cool W/O cutting big holes in the cowl..
The 1 1/4" longer nose moment W/6# of radial hanging off it should help tremendously in the CG department.
|Jun 18, 2013, 01:59 PM|
7 1/2 HP 12.2:1 CR SAITO FA512HCR3D CDI BBC Radial
I just concluded negotiating a refund for an internally damaged FA450R3D radial that I bought here on RCG.
I am using (new) parts from FA180, FA220 & FG57T engines to rebuild the FA450R3D W/a .035" case deck reduction. I am building a 5.12 Cu. In. 3 cylinder radial W/12.2:1 CR & induction improvement including a modified back plate & a 12mm FA220 carburetor as well as C&H CDI to light things off in a consistant manner.
I will use a modified FA180 intake manifold similar to the one pictured below on Hobbsy's FA150. The back plate will have to be machined for the larger gland nut. The engine will be run on 20mm standoffs & the firewall might have to have a small hole for clearing the velocity stack on the FA220 BB carburetor. It might help power to pull cooler air from the fuselage rather than the hot cowl area.
If the engine responds as well as the FA180HC CDI BBC engine did, W/similar modifications, I should see over 7HP, perhaps 7 1/2 HP on 15% Cool Power.
I learned a few interesting facts along the way.
1. The FA180 pots will drop right into the FA450R3D case W/O modification. There is no "step" like in an FA150 case.
2. The FG57T pistons are .016" taller in compression height compared to the FA180 pistons. On an FA450R3D rod they are the same hieght above the deck as a stock FA180 piston in an FA180 engine. That means the combustion chamber volume will still be 3.4cc & even W/O a case deck reduction they yeild 9.24:1 CR on the FA450R3D bottom end. W/a .035" case deck reduction the chambers shrink to 2.5cc. With the slightly shorter 150 stroke of the FA450R3D, (27.98cc per cylinder compared to an FA180 volume of 29.1cc) that computes to 12.2:1 CR.
|Jul 07, 2013, 02:14 PM|
Had a maiden of my FW190. Flies great. Almost everything went well, gear failed to extend so I had a belly landing. damage was very little, prop and a few scratches. Here are a couple of photos of the bird in flight and before takeoff.
|Jul 16, 2013, 08:49 PM|
They seem to have a problem keeping parts in stock.
I have ordered parts as the become available, sometimes getting the last few examples.
I'm waiting of 180 valves but I now have enough parts to do clearancing on the bottom end so I'll be posting some things in a few days.
|Oct 26, 2013, 04:58 AM|
Go with the sierras......it'll take a bit of work to make them fit, but well worth it in the end as you'll never worry about some small part breaking or the oleo bending etc.
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