NASASpaceFlight.com Forum

General Discussion => Q&A Section => Topic started by: ZachS09 on 03/13/2022 01:42 pm

Title: Are H-IIA fairings compatible with Delta IV 4-meter second stage?
Post by: ZachS09 on 03/13/2022 01:42 pm

I was looking up the Delta IV Medium and H-IIA rockets and saw their respective fairings are 4 meters in diameter. The fairings also vary in mass with the Delta IV Medium's being way heavier.

H-IIA: 1,400 kg
Delta IV Medium: 2,800 kg

(Source: www.spaceflight101.com)

My question is: could the lighter H-IIA fairing have fitted on the 4-meter Delta IV second stage? If not, why?

Title: Re: Are H-IIA fairings compatible with Delta IV 4-meter second stage?
Post by: Jim on 03/13/2022 01:50 pm

not enough info to make a determination.  Does the H-IIA use a PAF and total encapsulation.  Is the PAF interface the same dimensions and bolt hole pattern as the Delta IV ?

Title: Re: Are H-IIA fairings compatible with Delta IV 4-meter second stage?
Post by: ZachS09 on 03/13/2022 02:31 pm

I made a comparison photo of both fairings, using their respective launch user's guides as sources.

Edit: Added comparison photo of both payload adapters.