Author Topic: Colossus building question (Read 1348 times)

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

James Mills · « **Reply #1 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

Steve Helmick · « **Reply #2 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.

Steve

James Mills · « **Reply #3 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

john e. holliday · « **Reply #4 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

Bill Little · « **Reply #5 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!

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......

Big Bear

Randy Powell · « **Reply #6 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.

Author Topic: Colossus building question (Read 1348 times)

James Mills

Colossus building question

James Mills

Re: Colossus building question

Steve Helmick

Re: Colossus building question

James Mills

Re: Colossus building question

john e. holliday

Re: Colossus building question

Bill Little

Re: Colossus building question

Randy Powell

Re: Colossus building question