Dyneema cord spirally wrapped
In the quest for higher altitudes you want to build light wrockets that can hold as high as possible pressures. In reaching higher pressures i did some launches with reinforced bodies to see the effect of the (external) reinforcements on flight performance.
The first one was a reinforcements with Dyneema SK 65 cord that is mostly used in stunt-kite flying. This cord is very lightweight able to handle a minimal force before break of 100kg.
Wrapped my 7.2 liter wrocket with 60 spirals (about every 3 cm a winding). See picture of the wrocket on the launching pad. Wrocket was launched at 200 psi, 3 liter water fill.
On its way up the rocket was instable wobbled around its longest axis.
Maybe the turbulence of the spiral wrap was so bad that the stabilizing of the fins was a lot less. (suggestion from Clifford Heath) apogee was, only, 560ft / 170 meter.
Glass fiber tape
Then for comparison i wrapped the same rocket with glass fiber tape, (removed the cord) See detail.
The rocket was launched at same conditions, 200 psi 3 Liter water fill.
Flight was stable this time and reached apogee height of 650 ft / 198 meter.
A lot better compared with the dyneema cord.
Both flights where logged with the altimeter and results are compared in chart below.
The chute on the glass fibre launch was not fully opened, that why the decend rate is a bit quicker.
