running the engine without a prop

[Guest rocketdriver]

I have a KR2 in my shed and I want to run the EA 81 subaru motor to check for leaks etc etc. It has a flywheel and reduction drive. Due space and a steep driveway, I can't run it with the prop on.

 

Question. Is it safe to run the engine with the prop off? Do I run any risk of damage due to no prop?

 

Any recomendations would be welcome ....

 

Cheers

 

RD

 

 

[Deskpilot]

DF says it all. As a plus, you have the reduct box as a load. There's a video out there of a race plane at Reno that loses it's prop and the engine goes critical in no time flat. Landed safely but one huge repair bill. What you propose is totally safe IMO.

 

 

[fly_tornado]

I have a KR2 in my shed

Pics ?

 

 

[Guest rocketdriver]

Hi Fly Want to buy one?!!

 

See http://www.recreationalflying.com/showthread.php/124619-They-are-here-at-last Theres a few photos in there.

 

....We've nearly got one ready now .... just the finishing touches to do .... went up to Morrabbin today to get some cowling screws .....

 

Regards

 

RD

 

 

[fly_tornado]

no I have enough issues to keep me busy. I watched a KR2 land a few weeks ago, they look tiny but with the right engine they look like they will go like a rocket.

 

 

[Yenn]

They are tiny and they will go like a rocket. but they will also very quickly slow down in a steep turn or other high drag manouevre. Don't ask how I know.

 

 

[Guest rocketdriver]

go on, do tell!

 

 

[bushcaddy105]

Unless you have an original EA81 flywheel on the engine, DON'T! With a lightened flywheel, there is the risk that it will kick back while cranking and stress the flywheel attach bolts. And there is the issue of no prop = no cooling air if the test run is extended.

 

QUOTE=rocketdriver;273766]I have a KR2 in my shed and I want to run the EA 81 subaru motor to check for leaks etc etc. It has a flywheel and reduction drive. Due space and a steep driveway, I can't run it with the prop on.

 

Question. Is it safe to run the engine with the prop off? Do I run any risk of damage due to no prop?

 

Any recomendations would be welcome ....

 

Cheers

 

RD