[AR] Re: Thrust augmentation?
- From: Henry Spencer <hspencer@xxxxxxxxxxxxx>
- To: arocket <arocket@xxxxxxxxxxxxx>
- Date: Thu, 11 Feb 2021 11:37:21 -0500 (EST)
On Thu, 11 Feb 2021, Dr Edward Jones wrote:
https://archivesite.jetex.org/motors/motors-accessories.html
I remain skeptical of this thrust augmentation. What's your opinion?
It's for real. The same amount of energy gives you more thrust if it's
spread over more exhaust mass, energy flow being 0.5*massflow*v^2 while
thrust is massflow*v. The downside is the mass of the hardware, and the
intake drag. Easy for it to show a gain in the Jetex application: model
aircraft at low speed. Not so easy to get useful results over a much
wider speed range (high-speed air intakes are a very complicated subject,
and in particular they don't work well if placed near the rear end of your
vehicle) in a system where hardware mass matters more. At first glance
it's appealing, and many people have tried to make it show a profit for
rockets, so far without much success.
Henry
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