General Category => General Helio Discussion => Topic started by: Doug Johnson on October 17, 2019, 09:28:19 AM

Title: Helio Factory's proposed Helios
Post by: Doug Johnson on October 17, 2019, 09:28:19 AM
I thought I had a previous post on twin Stallion but couldn't find it. Here is a short excerpt from Rod Simpsons magazine article.

Does anyone have any pictures of these proposed Helio especially the H-1650T and GAC-100, that they are willing to share?

Helio did study a twin-engined version of the Stallion, the H-634, which would have had a pair of 317 shp Allison 250-B15 engines mounted on a beam through the nose, but this aircraft never flew. They also considered several designs for a twin-engined counter-insurgency aircraft designated H-1320 and multi-role transport versions known as the H-1320T (Transport), H-1320AR (armed reconnaissance) and H-1650T but none of these got beyond the drawing board.
Helio hiatus
In the mid-1960s, Helio’s parent company, General Aircraft Corporation (GAC) started to develop the GAC-100 4-turboprop commuter aircraft. This used a number of Helio-designed high lift devices, but the project was cancelled in 1969, probably due to lack of funding.
Title: .
Post by: Doug Johnson on October 17, 2019, 09:44:05 AM
Title: Re: Helio Factory's proposed Helios
Post by: tailhook on October 20, 2019, 10:36:42 AM
A shame Helio Aircraft LTD. did not have the resources to go further with this proposal. The Helio 2000 Frieghtliner  was in response to the FedEX contract for a single-engine cargo/utility type aircraft to serve short haul overnight package delivery. The company was short on funding and near closure by the time Cessna had already flown the 208 Caravan.

On November 20, 1981, the project was given a go-ahead by Cessna for its Pawnee engineering facility. John Berwick, chief engineer at Pawnee, came with a concept of a single engine, high-wing airplane with a large payload. Berwick had originally approached VP Bill Boettger with the idea and once Dwayne Wallace approved it, Berwick told Russ Meyer he would design it.

The prototype first flew on December 9, 1982. The production model was certified by the Federal Aviation Administration (FAA) in October 1984. A freighter variant without cabin windows was developed at the request of Federal Express as the Cargomaster. Another cargo variant for Federal Express, with a longer fuselage and a cargo pod under the belly, was developed as the 208B Super Cargomaster and flew for the first time in 1986. FedEx was initially planning to build twin-engine piston-powered airplanes with Piper Aircraft, but picked the Caravan after surveying it and having flown the prototype, becoming its standard carrier.
Title: Re: Helio Factory's proposed Helios
Post by: Doug Johnson 1 on October 20, 2019, 01:07:37 PM
I just ran across this thought you guys might find it of interest.

Here is a proposed Helio H-6 that made it from the drawing board and artist's conceptions to actually being built with some changes as the H-500 then military designation U-5, the two civilian H-500 prototypes 1 and 2 became U-5s then 2 were contracted as U-5As, another contract for 3 U-5Bs eventually the earlier models were upgraded to U-5Bs.

The dates are of interest also, the U-6 was proposed in 1951 but the U-5 was built in 1960.

Title: Re: Helio Factory's proposed Helios
Post by: Kevin Dunn on October 21, 2019, 09:21:18 AM
Those are really big props. Wonder if they ever found someone to build them.