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Building Tips and technical articles. => Building techniques => Topic started by: Greg L Bahrman on September 18, 2009, 07:00:53 PM

Title: NEW ATTITUDE CHANGE
Post by: Greg L Bahrman on September 18, 2009, 07:00:53 PM

I lost interest and quit working on my Sig Magnum when I realized it was going to be heavier than I had planned, so it has been sitting collecting dust for at least a year. My birthday arrived and I always tell the family and my kids, send money. No socks or underware and they came thru this year. Mom, son, daughter, wife I owe them. Me, I end up with a Ro-Jett 67. Back to the Magnum. So I get to thinking about Al Rabes tube reinforced flaps that he says work on heavy planes and I start thinkin on the Ro-Jett 67. Between making new flaps and a new motor I think this plane has a chance. I have to redo the cowl for a rear muffler and mount the motor and make Al's flaps. I offset it this time about 1/2 degree. Lonestar got a wood order for flaps. And I'm as excited as a pig in szit.....NEW ATTITUDE

Title: Re: NEW ATTITUDE CHANGE
Post by: Jim Oliver on September 18, 2009, 07:50:50 PM

Greg,

I still have the Magnum kit you sent to me-----did you use the Sig wing cores or some custom cut?

What do you think it will weigh?

Thanks,
Jim

Title: Re: NEW ATTITUDE CHANGE
Post by: Greg L Bahrman on September 18, 2009, 08:54:39 PM

Well it weighed 60 oz. all together with no paint and no flaps. I already knocked off about 3 oz. by re-doing the stab and elevator as it was 6 3/4 oz. ........So 4 oz. for flaps 5 ounces for paint maybe 68 oz. if I'm lucky. I think I will paint the fuse and monocoat the wings.
I used foam cores from Crist which were way better.

Title: Re: NEW ATTITUDE CHANGE
Post by: Tom Niebuhr on September 18, 2009, 09:59:35 PM

I have seen Richard fly with the RoJet .67. It appears to the most forgiving of these engines. It is happy in a large range of RPMs

While the airplane is following Ted's "Porkyness". the .67 and effective flaps will help. The key thing now is to get flying.

Title: Re: NEW ATTITUDE CHANGE
Post by: Gene O'Keefe on September 19, 2009, 08:04:44 AM

Greg, plz tell me where/who you got that spinner from ?
Thanks,
Geno

Title: Re: NEW ATTITUDE CHANGE
Post by: Greg L Bahrman on September 19, 2009, 05:17:23 PM

<Greg, plz tell me where/who you got that spinner from ?
Thanks,
Geno>

Hi Geno,
It's a 2 inch Randy Smith spinner. I polished it on my buffing wheel.

Title: Re: NEW ATTITUDE CHANGE
Post by: Walter Hicks on September 22, 2009, 02:51:22 PM

Greg,

  You will love the RO Jett .67 . It is very user friendly. I am using a RE Muffler by Scott Dinger, others are using pipes.

I heard Richard Oliver say a couple of years ago that it will be usable from 7000 to 11000 RPM . I have been using it at very low rpm with great results. Others run it with lower pitch props and higher rs.

Title: Re: NEW ATTITUDE CHANGE
Post by: Jim Oliver on September 22, 2009, 05:10:30 PM

Greg,

I ordered cores from Crist today.

Thanks,
Jim