Author Topic: ESPA Ring Masses  (Read 803 times)

Offline e of pi

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ESPA Ring Masses
« on: 05/07/2018 03:05 AM »
Dumb question, but I can't seem to turn up the mass of an ESPA grande ring such as those used on the OrbComm launches. I can turn up a lot in planning guides about the mass allowed to riders on the various mounting points, but not the actual ring hardware mass the vehicle has to lift in addition. Can anyone help out with this?

Offline brickmack

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Re: ESPA Ring Masses
« Reply #1 on: 05/07/2018 05:05 PM »
I can't find it either, but given the ESPA is basically just a machined block of metal with a few wires and a deployment mechanism on each port, you could probably get a decent guess just by finding the total volume of metal used and looking at its density. ESPA is made from 7050-T7451 aluminium, at 2.83 g/cc

Offline e of pi

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Re: ESPA Ring Masses
« Reply #2 on: 05/09/2018 05:37 PM »
To follow up, someone from MOOG was nice enough to answer an email, and apparently the short answer is:
- ESPA Standard (6, 15 ports, EELV interface, 24 tall) is 136 kg
- ESPA Grande (4, 24 ports, EELV interface, 42 tall) is 211 kg

However, those masses can apparently change for customized applications.

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