Securing a gyro

[bruce]

My new prop arrives tomorrow and I"m wondering the best way to secure the gyro for a ground run-up to check the pitch? Just concerned about stress to the gyro if I tie it down incorrectly.Cheers,Bruce,

[asra]

With a rope. (Joke)Just tie it low way below the centre of gravity. I usually attach mine securely to the keel around the tailwheel. Depending on how much thrust you have, no damage will be done tying it here. Just have an escape plan in case it goes all wrong.

[bruce]

Thanks Tim

[adrian_clince]

i second that ideawhat sort of engine you got and what size prop you got . sm of us might be able to give you a bit of head start , if thats even possiblebut , with the teethering , i did what tim did, works a treat . but make sure you keep an eye on the keel where you tie it up at all times, it sounds really dangerous with it spinning flat out, and yeah, take good note where the kill switch it cheers adrian

[bruce]

Got an EA81 and fitting a 72 inch BolleyBruce

[Des Garvin]

Bruce, what motor do you have on your machine? hp wise that is. I personaly use a flat new 1000kg rated certified load tie down strap with 6 half hitchs around the keel. 3 behind the mast and 3 infrount of the mast. then anchored to a green tree that would stand up to a 50 hp tractor and not budge. I keep the area around the prop/keel clearence zone strap on the under side of the keel and no hitch knots in that versinity. This is on a 503 or a 582 Rotax. I think Mcegale posted some thing on this some time ago.And make sure you sit in the seat as if you are flying when running up the revs. Cheers Des Garvin

[adrian_clince]

the gear box ratio might be something . i have a ea 81 . with a 2.2.1 reduction belt drive, i had a 72 inch bolly - still got it but its now a 70 inchi set it up on the gyro with the gyro leaning back , setting the prop up i set a height say around the chest height as to keep it all the same i set it around the 18 degrees and setting the gauge about 3 inchs maybe in from the tips , that allowed me to rev out to 4800- 5000 rpm. but it can very , i find loosening the bolts around the hub and just using the 6 bolts that hold the hub on just lose enough so you can turn the prop easy , it can be very frustrating trying to get the bubble in the middle if its just a tad to tight , but remembering to tighten up all the bolts when down , it sounds hard but , do it a few times and you find its, not to bad. but what i found that 1 degree was about 200 rpms . so if you set the prop to say 18 degrees and you tighten all the bolts run the engine up and it runs at say 4600 max revs you would only take 1 less degree off each prop make your 4800 revs. , i hope that gives you a starting pointcheers adrian