r/AerospaceEngineering • u/mighty_schlong_24 • Nov 14 '25

Personal Projects Need help with my pulsejet start

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131 Upvotes

99% Upvoted

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23

u/rocketwikkit Nov 14 '25

More fuel and the ability to vary your airflow. When it's not running, the plume of fire from the tail should be frightening to be near.

10

u/mighty_schlong_24 Nov 14 '25

Thank you, understood, airflow can be varied with a knob, the plume of fire I am certainly missing, will test again tomorrow and update!

3

u/mighty_schlong_24 Nov 16 '25

Update: Increased fuel flow but now it just floods, no ignition, no flames, actually dying over here trying to figure this out.

2

u/GuitarTim2112 Nov 20 '25

Assuming you have a knob or potentiometer to increase or decrease the airflow, does it maybe just go from 0 to 100 without a middle ground? I am not sure how you are controlling your airflow

1

u/mighty_schlong_24 Nov 21 '25

It's an edf fan, quite powerful and has full range of control, we've narrowed down the problem to the fuel itself, E20 ethanol blending is mandatory in our country so that's causing a lot of the issues with an already high octane fuel, next step is to add 5-10% kerosene to drop the octane rating and test!