Author Topic: Helio Courier MK II "Caballero" H-250  (Read 6510 times)

mrhelio

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Helio Courier MK II "Caballero" H-250
« on: December 05, 2010, 01:40:30 PM »
Helio Aircraft came up with the notion for a low cost, direct-drive powered airplane to use 80/87 octane fuel and higher TBO. The Mark II was designed and built in late 1964 and certified in early 1965. Powered with the Lycoming O-540-A1A5 250 HP and was a foot longer than the 295. The Caballero was within the same configuration as previous piston models except for a new installation of powerplant. The 250 utilized the same engine as the Comanche 250 and Aztec. Gross weight was 3400 pounds, although empty weight was considerably light for the large size of a Helio, it did perform well down low. Density altitude was a killer in the "hot" high altitude scenario. Two things I do not recommend for the 250, the 120 gal. fuel or the 3800# gross weight mod, there is not enough power for these options. At 3000 pounds the airplane flies well, above that it gets a bit sluggish.
« Last Edit: December 05, 2010, 02:44:07 PM by mrhelio »

c/stolaircraft

Re: Helio Courier MK II "Caballero" H-250
« Reply #1 on: February 15, 2011, 05:41:35 PM »
Can you put a Io-540 300hp in a H 250? what about a TSIO-540  350 hp?
Reuben, future mission pilot and helio fan

mrhelio

  • Guest
Re: Helio Courier MK II "Caballero" H-250
« Reply #2 on: February 16, 2011, 07:06:26 AM »
There is a one time STC for the Lycoming IO-540-K 300 HP or it might be a field approval. If you want a high fuel burn then by all means look at the specs for a TIO-540-J2BD (350 HP) these are installed on the H-700. Count on 20 GPH, performance increase would be minimal at best. With a Hartzell 88" three-blade at power set at 2575 RPM you get sea level power to 15,000 feet. You can pull it back to 17.5 GPH but a cowling design to include ram air recovery would be needed to make this an acceptable option.

Louis

Re: Helio Courier MK II "Caballero" H-250
« Reply #3 on: February 16, 2011, 03:17:28 PM »
Can you put a Io-540 300hp in a H 250? what about a TSIO-540  350 hp?

if you do that, and try to put your gross weight up to 3800 pounds with the new power to weight ratio, be carefull that the pickup of the wing spar is not the same on a 250 than on a 295 long range tank.  Some inches shorter.  I don't know compare to a 295- 60 gallons, but i did saw the difference between a 250 and a 295-120 gallons.

May be the difference is between a 60 gallons and a 120 gallons wing, or it is between a 250 and a 295 all models, or between a 250 and a 295-120 gallons,  I don't know, but i did saw with my eyes the difference between a 250 and a 295-120 gallons

Louis

c/stolaircraft

Re: Helio Courier MK II "Caballero" H-250
« Reply #4 on: February 16, 2011, 04:00:02 PM »
Hey thanks I was just wondering for now. I got to get a plane first and wait till i am 17 to get my P.P. L.  ;) I any have a extra helio ya want to give away let me now.... Jk But.........

Reuben Naumann
Reuben, future mission pilot and helio fan