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Building Tips and technical articles. => Building techniques => Topic started by: James Mills on June 24, 2009, 07:25:43 PM

Title: Colossus building question
Post by: James Mills on June 24, 2009, 07:25:43 PM

I have an Umland kit of the Colossus that I'm going to build this fall and was curious what weight I should aim for?

Thanks,

James

Title: Re: Colossus building question
Post by: James Mills on June 24, 2009, 08:36:27 PM

Ty,

Thanks for the reply.  I'm not going to start mine until I finish a few other projects.  I've a PA 40RE/muffler I'm going to use.

James

Title: Re: Colossus building question
Post by: Steve Helmick on June 24, 2009, 09:46:49 PM

My recollection is that the Colossus is around 750 square inches. I know the PA .40 is a strong engine, but I'd want more cubic inches. I've seen Gordan Delaney fly his Colossus with a Glenn Dye reworked ST G.51.  ;D Steve

Title: Re: Colossus building question
Post by: James Mills on June 24, 2009, 11:09:47 PM

I spoke with Randy when I first got the kit and he said the 40 would be plenty (it's the big one).  If all else fails I have a 61 as well.  According to the plans it's 698 sq.

Thanks,

James

Title: Re: Colossus building question
Post by: john e. holliday on June 25, 2009, 09:29:13 AM

Jim,  go with the big engine.  The plane is huge.  I have seen Gordon's version in person and it is huge.  I would say the .51 would be the smallest engine to even think about. 

Now Gordon is a prolific builder and can finish light.  Look him up on here or thru John Miller in members lists.  Type in full name and you will find it sooner.  Send them a PM or E-Mail.  They are terrific gentlemen.  DOC Holliday

Title: Re: Colossus building question
Post by: Bill Little on August 19, 2009, 08:29:55 AM

Hi James,

When this first hit, I missed it, sorry!  I would normally agree with bigger is better, but in this case, I am going with Randy Smith.  The PA 40 you have will power basically any plane that a ST G51 will, if set up and run properly.  I have had some VERY, VERY good ST G51s and also we have a PA 40.  So I can say the PA 40 will do the job.  it ain't your Grandma's 40! LL~ LL~  A PA 40 will fly the old ST 60 planes with no problems up to the 70 oz. range.   Now, a PA 51 will do even more!  And the PA 61 will not even know it is running...... ;D

Big Bear

Title: Re: Colossus building question
Post by: Randy Powell on August 19, 2009, 08:57:13 PM

I also have the Umland kit. I plan to use a Magnum 53 in mine, though a PA 40UL may get the call if it comes out nose heavy. The PA 40UL has plenty of grunt.