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Old Oct 19, 2012, 11:05 PM
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Build Log

Isis P3


Here is a sneak peak.

Wingspan: 772mm - 30.4"
Length: 861mm - 33.9"
Motor Option 1: Hacker driven VPP
Motor Option 2: 2205 1500kv 25g
ESC: 10amp
Receiver: AR6115E
Servo: "3.7g" (actually 4.6g) on each surface
Battery: 3s 370mah or 2s 500mah
Estimated AUW: under 150g

This is a 150% derivative of my Isis G3 design. This one is made for more precise control hence the "P3". It is made from 3mm depron all around. I have everything, but the ailerons, SFGs, and the rudder cut out. This is targeted at our indoor fly in on the 4th of November.

Enjoy,
Kev
Last edited by boredom.is.me; Oct 23, 2012 at 08:41 PM. Reason: component list
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Old Oct 20, 2012, 02:04 AM
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I just decided to cut out the ailerons and am about to cut out the SFGs. Unfortunately, I am out of material for the rudder. I'll have to make a trip to the LHS or see if a friend has some small pieces.

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Old Oct 20, 2012, 04:41 PM
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Foamies for life! #f3p
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Why the different colors of foam?
strength?
coolness?
to save weight? (because of no paint)


Not Free
Old Oct 20, 2012, 04:51 PM
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strictly for looks - I won't be painting it.

These were the three possible options.
Old Oct 21, 2012, 04:52 PM
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I'll be using fiberglass (white..ish) for the aileron control rods and carbon for the tail. Again, strictly for looks.
Old Oct 23, 2012, 08:21 PM
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I got the underside bracing completed. I may do top side on the tail if needed. First flight will tell.

I never cut the SFGs out. I will mos likely hook ailerons up tonight though.

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Old Oct 23, 2012, 08:22 PM
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Looks nice!

Free
Old Oct 23, 2012, 08:43 PM
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Hate to be the wet napkin of the bunch but for the next one you could make the elevator a bit smaller. It is enormous and that causes extra weight. It could be way scaled down from there. Plus if it's a bit smaller it will be less stress on your servo when reversing your airplane with that VPP system! You might find it has a bit of blowback.
What are you running for control linkages? Pull pull on the tail or two inch push-rods?
If I remember correctly about what RJ had on his VPP at the Holiday Electric Fly here in Ohio last year. He ran magnet wire to his servos which were positioned right in front of the tail surfaces, to achieve the least amount of slop as possible. I would suggest the same for a VPP design. Pull pull cable will stretch, and if they are made tough enough and tight enough they will just crumple the airframe. Long pushrods will just flex. They will flex on the push from blowback and they will flex all over the place all the time from going backwards.
Just my two cents.
But good looking design, I am excited for the video?
Keep up the good work!

Chris G.
Old Oct 23, 2012, 08:58 PM
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Thanks.

I'm wondering if I should implement pull-pull on the tail instead of pushrods...
Old Oct 23, 2012, 09:00 PM
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Pull pull can stretch. It all depends on what you want to do. If you want to move the tail surfaces while going backwards you need to use something special for pull pull cables. If you want to do pushrods they had better not be 1 mill carbon and they had also better not be longer than 3 inches.

Chris G.
Old Oct 23, 2012, 09:04 PM
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Quote:
Originally Posted by RCvehicleGuy View Post
Hate to be the wet napkin of the bunch but for the next one you could make the elevator a bit smaller. It is enormous and that causes extra weight. It could be way scaled down from there. Plus if it's a bit smaller it will be less stress on your servo when reversing your airplane with that VPP system! You might find it has a bit of blowback.
What are you running for control linkages? Pull pull on the tail or two inch push-rods?
If I remember correctly about what RJ had on his VPP at the Holiday Electric Fly here in Ohio last year. He ran magnet wire to his servos which were positioned right in front of the tail surfaces, to achieve the least amount of slop as possible. I would suggest the same for a VPP design. Pull pull cable will stretch, and if they are made tough enough and tight enough they will just crumple the airframe. Long pushrods will just flex. They will flex on the push from blowback and they will flex all over the place all the time from going backwards.
Just my two cents.
But good looking design, I am excited for the video?
Keep up the good work!

Chris G.
Thanks for the feedback. I posted before seeing your reply.

It's actually a scaled up design which explains the elevator size. The original design is actually kinda stubby. On this one, I extended the tail, added balance tabs on the ailerons, and even extended the wings slightly while still narrowing them down a little. I can still go back and reduce the elevator size without any difficulty. Honestly though, I just like the massive elevator. It's what pieced the design together for me.

I wasn't sure if I should have used pushrods or pull-pull, but I really like the rearward servo idea.

Video! November 4th
Old Oct 23, 2012, 09:04 PM
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Quote:
Originally Posted by RCvehicleGuy View Post
Pull pull can stretch. It all depends on what you want to do. If you want to move the tail surfaces while going backwards you need to use something special for pull pull cables. If you want to do pushrods they had better not be 1 mill carbon and they had also better not be longer than 3 inches.

Chris G.
^^^
Again.
Old Oct 23, 2012, 09:33 PM
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The counter balances and less chord more span for the ratio is a good idea.
Rearward servos is a great idea! It should also help make up for the brick up front, 25 gram motor! VPP system too. Should balance it out.
Hand-cut kit or did you use a CNC machine? Kudos if it is hand-cut.

Chris G.
Old Oct 23, 2012, 09:47 PM
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Talking about control surface size, on the V2(if there is one), you might want to make the ailerons a tad bigger for vpp.

BTW, What makes Nov 4th the magical day?

Free
Old Oct 23, 2012, 09:57 PM
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JR indoor?
OR is that the third? Third and second?


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