The Murphy Builders Site

Hi folks,

I've put together a little website with photos and videos of my plane, some magazine articles and a short interview for a local news channel. 

Maybe you'll find something interesting.

Http://www.n2500v.com

Happy building and flying!

Fred
N2500V
SR2500 IO-540 Trike

Fred,
Great site. The pictures will be extremely helpful as I work to complete SR 93.
Best,
Jerry Folkerts

Hi Fred
very nice. I have to ask if you are happy with 250HP? I have a SR which I upgraded to 3500. I installed a Subaru engine rated at 240HP stock and the very best it would do was 700 ft per minute in climb out. That was with just me and approx half tanks ( I weight 150lbs wet).
I know many people will cringe at the use of a car engine but it ran well, just not enough ponies?

Great plane, awesome website and a heck of a job documenting everything Fred. Congratulations all around.

When you get to altitude, say taking off from Denver at 5,000'+, at near or close to gross weight, you'll wish you had more HP.

Ted

To SR-021: Have you flown at gross weight? What is the rate at 3,500 pounds? No I won't cringe at an automotive engine. I gave some thought to a Chevy by Bud Warren in Texas (deceased) It sure ran nice on a test stand at OSH some years back.
You can't have too much horse power! You can always throttle back and have the economy after a safe altitude.
OK Murphy limits the SR-3500 to 450 HP for structural reasons.
On my AEROMOOSEssna I used a Lycoming O-540 rated at 235 HP at 2400 RPM, with a tuned exhaust. At gross It performed satisfactorly at about 1,000 FPM. When I increased the RPM to 2550 (legal in some installations), It did real nice.
I am giving strong thought to rebuilding the plane since my "poor landing" and using an IO-540 rated at 290 HP / 2700 RPM, that should be a kick in the pants!

Dick Wampach N331RW SR-108 (see it in Sport Aviation Sept -2013 pg 84)

Folks, simply listing HP and FPM without adding what altitude and weight you were it is, well, basically, invalid. You are NOT going to see 1,000 FPM on 235 Hp taking off at a 5,000' field elevation. Dick, if I recall correctly, you are a bit N of Sacramento, so perhaps a field elevation of 100'; Fred is in New Jersey somewhere again if I recall correctly, so a field elevation of maybe 100'. If your goal is to load it up to 3,000 lb or 3,500 lb and in the Rockies, then you are in for a surprise even on a cool morning.

hello Dick
I never flew at gross or even close. I never flew with more than half tanks and always by myself. I would estimate a gross of maybe 2500 at most. When I bought the kit, (fifteen years ago) the literature said that 180hp was sufficent but I can't see it. I know the prop might have had a lot to do with it, but I dont know enough about pitch etc to know. Does not matter anyway as I am presently installing a M14 radial which tested 369hp at 2900 somewhere in Romania. I don't know the elevation there so could be all invalid. I also went with the original Russian paddles.
I was flying out of my back field which is basically a hay field (2200 ft). The elevation here is about 400 ft.
best regards
Jack