I also agree. What is your kn ratio? You mentioned you are using KNSU. From
the chart on this page, knowing your kn ratio, you can estimate you chamber
pressure (and therefore thrust):
http://www.nakka-rocketry.net/design1.html
That fact that the motor burned nominally without going boom or otherwise
misbehaving is a big step forward, nice work :-)
Richard
On Tue, Feb 13, 2018 at 11:48 AM, Ayson Baxter <donperry1@xxxxxxxxx> wrote:
I'm with BIll on this. Make it longer / change the KN ratio.
On Tue, Feb 13, 2018 at 12:37 PM, Bill Kuker <bkuker@xxxxxxxxxxxxx> wrote:
Sunny,
It's hard to say from the video (and being a little too lazy to go
simulate it myself) but from the video, the sound, and the burn time I
think you are a little bit short of developing the real thrust and pressure
you need to fly. The burn sounded like it was about 5 seconds, excluding
the build up and tail off, and for that size I would guess something less
than a 1 second burn.
Really, you need to measure the thrust and / or pressure to know what you
have.
-Bill
On Tue, Feb 13, 2018 at 10:40 AM, Sunny Gavali-Bhosale <
sunnygavali02@xxxxxxxxx> wrote:
Finally I have success with KNSU propellant with two grains in PVC. All
the dimensions are same as before. SugPro guys solved my problem with
inhibitors and so I could test this sweet success.
Now my greedy question is that, Is this motor able to take a 1kg rocket
at least 10m up? Also I noticed longer burntime compared to other dextrose,
sorbitol based motors. Propellant weight was something 190g with 2 grains.
Your help will be precious :)
Here's the video link: https://youtu.be/Ppq_LfDHDAo
Sunny Gavali
