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General control line discussion => Open Forum => Topic started by: Bill Mohrbacher on May 02, 2012, 07:49:23 PM

Title: Small Turbines
Post by: Bill Mohrbacher on May 02, 2012, 07:49:23 PM

Turbines development has really accelerated and size has gone up and also down!  How about a turbine less than 3" in diameter, about 5# thrust?  Probably way smaller than anything tried several years ago.  Of course they are not free!

www.sitewavesstores5.com/mm5/merchant.mvc?Screen=PROD&Store_Code=JetCat&Product_Code=P20-SE&Category_Code=TURB

Title: Re: Small Turbines
Post by: Trostle on May 02, 2012, 09:37:13 PM

Here is a smaller one:

http://www.lambert-modellturbinen.de/html/english.html

Just over 2 inches in diameter and about 5 inches long.

Keith

Title: Re: Small Turbines
Post by: Bill Mohrbacher on May 03, 2012, 05:28:57 AM

Thanks Keith, that is the one I was trying to find.  Guys are putting these on and IN FOAM RC planes.  Turbines now have sophisticated starting and monitoring systems.  Neglecting the cost (hah!) I don't see any technical or safety issues to prevent these from being used on control line planes.

Title: Re: Small Turbines
Post by: dankar on May 03, 2012, 10:57:38 AM

What I like about them is they are not loud at all. Watched a guy fly a nice F-86 and it flew wonderful. The F-86 and Mig-15 are my favorite Jets. Downside is mega bucks but sure its worth it .

Title: Re: Small Turbines
Post by: FLOYD CARTER on May 04, 2012, 02:58:25 PM

Turbine development has accelerated, but what about "acceleration"  with a reaction engine? 

Floyd

Title: Re: Small Turbines
Post by: Brian Hampton on May 04, 2012, 07:08:05 PM

Quote from: FLOYD CARTER on May 04, 2012, 02:58:25 PM

...but what about "acceleration"  with a reaction engine? 

Thrust is thrust whether from a prop or turbine but I have to wonder about the gyroscopic precession at 245,000 revs even if the turbine is mid-mounted.

Title: Re: Small Turbines
Post by: Dave Hull on May 07, 2012, 01:37:56 PM

You're going to need some good inlet designs if you are going to maintain thrust through the sharp corners of a control line flight. Unless you fly it like a dynajet speed plane--straight and level.

At the RC field across from our CL circles, we have noticed that a turbine crash virtually always results in a fire. So be sure to bring your fire extinguisher.

One other question: how do you recover from the dreaded runaway throttle, and have you sized your lines correctly?

McSlow