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Old Nov 10, 2013, 05:11 PM
Crashing at 8600ft
balthazar420's Avatar
United States, CO, Conifer
Joined Sep 2009
268 Posts
Build Log
Jupiter free flight balsa model conversion (Now with video of maiden flight crash)

I downloaded a set of plans for this Free Flight model. I wanted to test out some new (to me) build techniques. The result is a razor straight fuselage and wing.

I purchased a piece of galvanized steel and some magnets from Home Depot. I never liked using pins as with my ham fisted approach, I would always break things. This way IMHO is much cleaner and easier.

I will finish this model with an Aerolite covering, PZ Mini Vapor brick and the motor/GB/Prop from my "retired" Flyzone Albatross.

I learned what I needed to learn with this experiment, so this one has been placed in line behind several other projects which are entries into the MMBC and the BBCC3 contests. I will finish this gem before spring next year, I promise! LOL!

EDIT: Here is a video of the second flight. Again, the GB fell off. I need to figure out a good way to attach the motor to the airframe.

Jupitor maiden flight ar6400 PZ UM p-51 Gearbox RC Free flight conversion (0 min 31 sec)
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Old Nov 10, 2013, 06:54 PM
Gary
gklein's Avatar
USA, CT, Sandy Hook
Joined Dec 2009
810 Posts
I really like the building board approach. There is a magnetic commercial unit out there but at a crazy price tag. Home Depot - my kind of supply spot!

I like doing my alignments over a ruled grid. Maybe you could print one out and spray glue it to the metal building surface. Whoops! I have to go now - I just remembered something I need to get for one of the wife's chores from Home Depot.
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Old Nov 11, 2013, 09:37 AM
Crashing at 8600ft
balthazar420's Avatar
United States, CO, Conifer
Joined Sep 2009
268 Posts
I know, I looked at that one online, and I couldn't believe how much they were asking for it. The galvanized steel is 24" x 36" and was only $9 at HD. I purchased 32 magnets that cost around $6, also at HD, so I'm into it for 15 bucks? You can't beat that!
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Old Nov 11, 2013, 05:55 PM
skumgummi dave
Gresham, OR.
Joined Mar 2004
1,849 Posts
balthazar:

What are the dimensions of the magnets?

Thanks

Dave-
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Old Nov 12, 2013, 10:29 PM
Crashing at 8600ft
balthazar420's Avatar
United States, CO, Conifer
Joined Sep 2009
268 Posts
They are 1" by 1/4' by 1/4" they come in packs of 8!
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Old Dec 31, 2013, 04:57 PM
Crashing at 8600ft
balthazar420's Avatar
United States, CO, Conifer
Joined Sep 2009
268 Posts
This little model got some attention lately. I installed the FlyZone motor and gearbox from my Albatross. The landing gear are mostly finished. I will add a tail wheel later. I added a conventional vertical stabilizer. The plans call for a twin tail, but this will make the control surfaces much easier. I will still have the two side vertical pieces on the ends of the elevator. Maybe I can have 2 tail wheels, one on each.
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Old Dec 31, 2013, 05:44 PM
skumgummi dave
Gresham, OR.
Joined Mar 2004
1,849 Posts
balthazar420

Your Jupiter is coming along nicely. I followed your advice on the magnets and galvanized steel. I now have a new magnetic building board.

Many thanks;

Dave-
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Old Dec 31, 2013, 08:52 PM
Crashing at 8600ft
balthazar420's Avatar
United States, CO, Conifer
Joined Sep 2009
268 Posts
Oh cool! Glad to hear it! I couldn't believe how much they wanted for a metal builders table online!
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Old Jan 01, 2014, 08:11 PM
skumgummi dave
Gresham, OR.
Joined Mar 2004
1,849 Posts
Yes, saving money that way frees up more resources for other hobby goodies.
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Old Jan 03, 2014, 08:20 AM
Registered User
Beijing, China
Joined Nov 2006
1,223 Posts
Your Jupiter is looking good.

For a magnetic building board, has anyone tried a white board? It seems like a fairly glue resistant surface, and they all seem to have steel behind them.
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Old Jan 03, 2014, 09:23 AM
Crashing at 8600ft
balthazar420's Avatar
United States, CO, Conifer
Joined Sep 2009
268 Posts
That would be neat if it worked. You could write notes and measurements on the board and then easily wipe them off. I wonder how the steel would handle dry erase markers? It might just wipe off. I will try it.
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Old Jan 04, 2014, 03:24 PM
Crashing at 8600ft
balthazar420's Avatar
United States, CO, Conifer
Joined Sep 2009
268 Posts
I have decided to finish the Jupiter in Aerolite (solite) transparent yellow and blue. I like the scheme on the picture below. Hopefully I can get it right! Speaking of that, does anyone have a picture of this model finished? I would love to see how she looks finished!

Here is a link to the plan download...http://www.rcgroups.com/forums/showthread.php?t=1250043 Many thanks to Planeman for posting this plan!
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Old Jan 04, 2014, 10:48 PM
Crashing at 8600ft
balthazar420's Avatar
United States, CO, Conifer
Joined Sep 2009
268 Posts
The wing loading will be very light. I am planning on a 21 gram (.74 oz) AUW (hopefully lower ) and the wing area is a little over 49 inches², so the wing cube loading will be at or under 3.6! That is what I want, a lazy, slow flyer! With the brick, she comes in at 18.6 grams. The only thing left is the covering, CF control rods and geometry, control horns and various other small details. I am considering covering only one side of the wing and elevator to save weight. Hopefully I will have some more updates soon!
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Old Jan 07, 2014, 11:42 PM
Crashing at 8600ft
balthazar420's Avatar
United States, CO, Conifer
Joined Sep 2009
268 Posts
I changed my mind and decided to go with a tissue covering. I have some orange tissue and white. As you can see, I did the wing in orange. I might use the white tissue on the fuselage. Then I can call her the Cream-Cicle. It looks alright for a first time. The wing warped a little, but I guess you can't expect such a light structure to not flex. I will add some struts to hold the leading edge in place.

EDIT: A little time above the steam coming from the tea kettle fixed that warping straight away!
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Old Jan 09, 2014, 12:58 PM
Crashing at 8600ft
balthazar420's Avatar
United States, CO, Conifer
Joined Sep 2009
268 Posts
Wow, the tissue is actually pretty heavy! The Jupiter has gained a considerable amount of weight. I just threw all of the white tissue onto the scale, so the AUW should be less than 30.8 grams, I hope! That is kind of a shock to see how much weight was gained! YIKES! It looks like I will have to revise my wing loading goals.

I changed the wheels to a pair of Guillows red plastics. They are .9 grams each. The other wheels were 1.2 grams each. I may go with depron disks or something else.

The wing was too flimsy and broke several times right at the root. i added a 1/32 sheet brace to cover the whole area emcompassed by the middle rib and the rib on either side. For only 1 gram of extra weight, the wing has gained much needed strength. This new rigidity also allowed for correction of warping caused by the tissue shrinkage.

Once again, I have used a plastic bread bag tie to make some control horns. I like the fact that you can just heat up the end of your metal z-bend and poke it through (melt it through) to get the perfect sized hole! No slop on this end!

Hopefully I can finish the rudder and elevator controls tonight and get the fuse covered. That's pretty much all I have left on this kool kat!
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