Using bypass air to increase rocket thrust

[Xd the great]

1 minute ago, YNM said:

The devices roughly explained here are very close to hush kits in form. Hence my question.

I know the actual hush kits are made for noise reduction, but could we use them for performance boost instead, or is that just a figment in people's mind ?

Well to increase performance you increase the thrust or the specific impluse.

Isp is partly controlled by the change in pressure of the exhaust, so some type of self enlarging engine bell would allow for more performance. You need to have the exhaust pressure equal to the outside pressure, or flow seperation happens and your rockets go boom.

Not sure if you are talking about this.

[YNM]

10 minutes ago, Xd the great said:

self enlarging engine bell

Read the first few posts esp. K^2 and OP, duh.

Gnom ICBM

Air-Augmented Rocket (wiki)

Hush Kit

[Xd the great]

15 hours ago, YNM said:

The devices roughly explained here are very close to hush kits in form. Hence my question.

I know the actual hush kits are made for noise reduction, but could we use them for performance boost instead, or is that just a figment in people's mind ?

Not sure bro. Most engines are already optimized with nice bells.

[YNM]

31 minutes ago, Xd the great said:

Not sure bro. Most engines are already optimized with nice bells.

Tell that to OP (@farmerben) then.