[simpits-tech] Need a plan

[Phoenix2000 at phoenixcomm.net]

At 04:43 AM 1/27/2005, you wrote:
>Bubba wrote:
>>Bubba wrote:
>>>
>>>It's been decided, I'm going to build an RV-4 :)
>>
>>Scratch that. RV-8 :) I'm 6'4" and 265#. The bigger cockpit would be
>>nice.
>
>Ok, scratch that again ;) I'm thinking KR2S with a 110 hp Corvair engine 
>now. I've been wanting to convert a car engine to spin a prop for years 
>and the Corvair looks to be about perfect. The only 3 problems I see with 
>converting car engines are the lack of thrust bearings (not that big of a 
>problem, look at all the VW motors flying around), the power range being 
>way wrong, and no way to use a hydraulic CS prop. Everyone tends to stick 
>gearboxes on there to slow the prop down, but there's a better way
>  Just get a camshaft ground for the range needed.

Bubu,
I have messed about with a few Corvair Engines in my back-in-the-day.. Its 
way heavy and the manifolds are part of the head casting itself... Crown 
Eng in Calif.. did my heads to mount Webers and beter exhaust systems. They 
had to mil the old headers (intake & exhaust) off the head and weld plates 
to it. Then it was a $$ in 71 dont know if they still are there.
Also you mentioned that you want to  get a custom ground cam.. ok but car 
engines make power at HI RMPs
and not LOTS of torque. your motor has to turn over at 1500 rpm thats about 
max for the prop. (but the motor
touque is at much higher rpms  good luck

Cris Harrison
www.phoenixcomm.net/~phnx2000/sim

and please take an other look at my soft sim idea...


>The prop thing isn't an issue anyway since I'll be using an electric prop 
>anyway. Best part of the whole car engine thing is that you can buy an 
>engine, rebuild it with the best parts there are, convert everything for 
>use in the air, and still spend half of what a used Lycoming goes for. I 
>think I'll make a few test pieces to compare the weight and strength of 
>the all wood fuselage construction on the plans (plywood over sticks) vs. 
>my prefered wood stringers infilled with foam and glassed inside and out. 
>Stick/foam/glass is WAY easier to build since you only need half as many 
>vertical members (if that) and no gussets, but it is heavier. And I can 
>still use the waterjet to cut stuff like all the 4130 fittings, the foam 
>infill panels, firewall, panel frame and subpanels, etc. The thing is 
>designed to be a 2 place, but realistically my fat backside makes it a 
>single place with lots of room for camping gear ;) I'm going to see if 
>it's feasible to set up the seat back with the ability to fold forward to 
>make a big, flat area in the tail for a bed. The wing's too low to sleep 
>under ;)
>
>Now to get that job, clean out the garage, order the plans, and start 
>throwing cash at a hole in the air...
>
>First thing I'll build is from the firewall to the seat back using cheap 
>materials (pine, cheap pink Home Depot foam, Bondo glass cloth, and cheap 
>epoxy) to use both to get used to building HUGE model airplanes and to use 
>as one helluva big joystick ;)
>--
>Steve
>mysticz28 at swbell.net
>He who seeks will find, and he who knocks will be let in.
>
>
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