Coup d' Etat in September of 1955
sets a parenthesis to the project of the I Ae 37 because of redistribution of public funds,
and it is not until 1958 that they were available again.
Horten does not remain inactive and introduces various changes in
the original glider, being the most notable the adoption of a normal enclosed
canopy, with a Plexiglas bubble sliding to the rear. After testing it 50
hours it was decided to build the engined version.
Then the planning of the project suffers a change. Dr. Horten suggested to continue with the building of the I Ae 37 as an advanced subsonic trainer, and develop the I Ae 48 as a twin engined, all weather, two - place interceptor, capable of reach (and surpass too) Mach 2.
I Ae 48 had a delta gothic wing that was succesfully tested in the I
Ae 37, a backwards slimmed fuselage to comply with the "area rule",
ejectable seats and two Rolls Royce "Avon" turbines equiped with thrust
deflectors that may enabled it to operate from airplane - carriers reducing
the run neccesary to takeoff.
During 1960, with the subsonic I Ae 37 in advanced state of building (it was expected to finish it in 1961) and with the works over the I Ae 48 recently started, again comes the order (and now definitive) to stop works because of "lack of funds".
End point (and a regrettably one) for one of the most
brilliant chapters of the history of the Instituto Aerotécnico -
|Fuselage lenght||11.50 m.|
|Wing area||50.00 m2|
|Empty weight (expected)||275 kg.|
|Maximum takeoff weight (expected)||16800 kg.|
|Engines||2 x RR "Avon" with a thrust of 5000 kg. each one|
|Combustible capacity||10000 kg.|
|Maximum speed (expected)||Mach 2+|
|Landing speed (expected)||155 km/h|