Estes 2231 Fin Alignment Guide Model Kit, Color Varies

I'd have given it a star or two more if one of the backets on the three fin arrangement wasn't loose. Causes these rockets to fly with bit of a wobble. The four fin arrangement works great, but I seem to be on a 3 fin kick.

Cheap and effective. I wish I had this when I was a kid. 90% of the time when I had a problem with model rockets as a kid it was because of fin alignment, and this goes a long way towards eliminating that problem with model rocket kits that need balsa wood fins attached to a cardboard tube. I have built several kits with my son and have had no problem with fin alignment. You still have to be careful, but this eliminates the guessing and trying to line up measurements on a curved surface so everything is straight and spaced evenly.

Viele Jahre habe ich die Flossen meiner Modellraketen mit Augenmaß und Flosse für Flosse angeklebt, was doch recht mühsam und Zeitaufwändig war. Jetzt geht es in einen rutscht. Ich habe das Teil auf ein Brett montiert was ein umkippen vermeidet. Die mitgelieferten Adapter passen gut bei normalen Flossen, ich habe mir noch eigene Adapter aus alten Motoren gebaut um noch flexibler zu sein, mittlerweile möchte ich das Teil nicht mehr missen.

I bought one of these almost 20 years ago and lost it while moving. This handy tool will align your fins so that they are perfectly even. Fin alignment is necessary if you don't want your rocket to spiral out of control. There are 4 forces that act on rocket bodies and if your fins are not aligned properly they will fly off during launch. The only time I ever lost a fin was because of improper alignment and I tried to eye-ball that the fins were even. Now, with this tool just bought off Amazon.com it was $5 less than every price I was finding. I have 7 rockets to build and utilizing this tool will help me more than trying to do it the old fashioned way. I am sold on fin alignment if you want to properly launch and recover your rockets successfully.

Son enjoys using it to build his rockets.