Su-30 V4 “Hovering Parkjet”

Discussion in 'Scratchbuilding!' started by RCPowers, May 15, 2014.

  1. callisto

    callisto Airman

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    Coming out of winter, I am ready to start painting. I'd like your opinion on this: Su30 - v4 airshow.jpg 2016-09-05 06.41.42.jpg
     
  2. e3_Scott

    e3_Scott Top Gun

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    Hi Everyone -

    First of my winter build projects starting to take shape:)

    2016-11-24 15.57.09.jpg

    I downsized the plans to 88%, gives me almost exactly a 27" wingspan, similar to pretty much all the other planes in my "hangar".

    I trimmed off the canards, but increased the wing area slightly to help out with the wing loading.

    Build will be with MPF Grade B, some scrap Depron for the elevons, KF4 airfoils made with paperless Dollar Tree foam.

    Currently I'm thinking of powering it with a 2212 2200 Kv motor with a Master Airscrew 6x4x3 prop. Controls will be elevons, ailerons and rudders (6 servos).

    A few other odds and ends I will modify and evaluate, will post about those as the build finishes up and I get some flight time completed.:)

    Cheers,

    Scott
     
  3. homey666

    homey666 Top Gun

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    This was my #1 fave and still is up there. I found that before I plowed it, super strong and solid build. Toit loik a toiga! I have a 2600 on it and it rips. Plan to fix it over the winter.

    Peter 20150902_152704.jpg
     
    Last edited: Nov 24, 2016
  4. e3_Scott

    e3_Scott Top Gun

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    Hi Everyone -

    Making good progress on my modified Su-30 V4:) Rudder shape and size modified somewhat, I put some 3mm carbon tube in the vertical stab to help reinforce the MPF.

    Fuselage together, waiting for the glue to cure, then I'll attach the canopy, followed by some shaping and sanding before mating the fuselage to the wing plate.

    2016-11-25 08.44.09.jpg

    I went with a fairly robust reinforcement plan on the wing as I want it to be able to withstand some higher G maneuvers as I will probably put a peppier motor in it eventually. The wing spars proper are 4mm carbon rod, the pieces down the center of the wing are 3mm carbon tube, the short piece along the back close to the elevon hinge line is 3mm carbon tube also, so far feels like a very strong wing:cool:.

    I went with a fixed horizontal stabilizer set up, I just like how this works on my park jets and it makes running elevon linkages a little easier for me as I don't have to worry about that part of the elevon moving.

    I modified the elevons to more "scalish" shape and dimensions, 2mm carbon rod in the "booms" for extra strength. I won't put any other reinforcement in the elevons as they are made from Depron, so nice and strong on their own in my experience. Once I do a bit of sanding around the edges of the elevons, I will bevel and attach those before mating the fuselage and wing plate.

    One thing I do want to experiment with on this build is using 5 gr nylon gear servos for the ailerons and rudders to evaluate their performance and durability. Using four of these versus four 9 gr nylon gear servos saves me 26 gr/0.9 oz of weight (based on weighing them on my scale) which hopefully will compensate for the extra carbon reinforcement and still allow me to end up with a weight of 610 gr/21.5 oz or less with 2200 3S battery. I find this to be a good weight for my flying conditions and preference. I will still use 9 gr servos on the elevons as they will take the most punishment and are fairly critical to being able to control the plane in my experience:).
    2016-11-25 08.43.21.jpg

    I'll continue to putter away as the rain falls, weather and build time permitting, I hope to maiden within a week.:)

    Cheers,

    Scott
     
    Last edited: Nov 25, 2016
  5. homey666

    homey666 Top Gun

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    That's a fine looking build, Scott and I like your mods. I find I look at rainy days differently now that I do this although too many consecutive days of rain make me a bit grumpy!

    Peter
     
  6. e3_Scott

    e3_Scott Top Gun

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    Hi Peter -

    Thanks for the kind words, we'll see how it all works out when it leaves my hand for the first time:)

    We have been setting some rainfall records here on Vancouver Island, so when I have a window of opportunity, I get out and "binge fly" blasting off 20-30 flights in a session with a couple different planes as I know it might be a week before I can fly again:confused: The things I do to feed this addiction:rolleyes:

    Cheers,

    Scott
     
  7. e3_Scott

    e3_Scott Top Gun

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    Hi Everyone -

    She is really starting to look more like a Su-30 now:)

    2016-11-26 15.56.37.jpg

    Just need to install the KF4 airfoils after all the glue on all these pieces have cured, then a final quick sanding and it will be ready for the mess of electronics in the bottom left corner of the picture:)

    The green tape on the vertical stabilizers is to help hold them perpendicular to the wing plate while the glue cures:rolleyes:

    Elevons are flipped up at such a high angle because of the tape I always like to put on the bottom of the elevon hinge for extra "insurance", it creates a little bit of tension on the bottom of the hinge. Once I have the linkages set up it will stay flat until I give it control input, the transparent duct tape has been working very well for me for control surface hinges for several builds now:)

    2016-11-26 16.01.43.jpg

    I hope to have it flying (probably without paint at first) by the end of the week weather permitting.:)

    Cheers,

    Scott
     
  8. Looks great, I did buy some of that tape but haven't tried it yet.
     
  9. e3_Scott

    e3_Scott Top Gun

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    Hi Everyone -

    Bare airframe is finished, all the sanding complete, ready to be joined by some gear:)

    2016-11-27 10.31.10.jpg

    Even with the extra reinforcement I put in the wing, I'm still pretty pleased with the weight of the airframe thus far, 161 gr/5.7 oz, I like that this plane has a fairly low parts count. All the gear including pushrods, battery weighs 391 gr/13.8 oz, so I should be able to put a pretty nice paint job on this one and still end up around 21.5 oz/610 gr or less which is where I normally like to be:)

    I have already been in consultation with a Sukhoi specialist from Indonesia on the paint scheme;), it will be a color scheme a bit new to me, but hopefully it will turn out OK:cool: I will probably maiden first without paint, then as I get some more rainy days later in the week (which I will:confused:), that will be a good time to paint:)

    Cheers,

    Scott
     
  10. Very nice Scott. :)
     
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  11. e3_Scott

    e3_Scott Top Gun

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    Thanks, Jeff:)

    Cheers,

    Scott
     
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  12. Can't wait to see the paint scheme.
     
  13. bimoadiprakoso

    bimoadiprakoso Top Gun

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    Hey Scott! Nice and clean built came of your skillful hands, as always

    I see you lose the canards of the first mod. It may give you slightly more speed than attaching them like on the stock plan.

    I'm sure it's expecting numerous of flight tests for optimum flight envelope. Looking forward to see it flies beautifully!

    Parkflyers International Parkjets

    My Scratchbuilding Journey
     
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  14. e3_Scott

    e3_Scott Top Gun

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    Thanks Bimo:)

    Cheers,

    Scott
     
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  15. e3_Scott

    e3_Scott Top Gun

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    Hi Everyone -

    Weather forecast looks good for tomorrow, plane is ready to go for it's maiden flight:)

    2016-11-27 20.27.09.jpg

    2016-11-27 20.28.07.jpg

    I ended up placing my servos concentrated around the CG marked on the plans, the pin indicates where CG is per the plans. From left to right, elevon servo, rudder servo, aileron servo.

    2016-11-27 20.31.03.jpg

    Makes for a nice "cozy" fit in the electronics bay to have it balance on the CG, will fine tune as I get some flights on it. If it stays this way, it should rotate very efficiently in all three axes without too much problem as over half the plane's weight is in a very small area close to the CG:)

    2016-11-27 20.27.25.jpg

    Current weight before paint is 582 gr/20.5 oz with a 2200 3S battery. Really enjoyed the build, very straight forward, low parts count, went together easily even with the assortment of mods I made.

    Excited to see it fly, hope to have a post flight report by this time tomorrow:)

    Cheers,

    Scott
     
  16. homey666

    homey666 Top Gun

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    Hey Scott, looks awesome! I'm in need of some of your trademark "throttle punch chuckles". Can't wait for the video.

    Peter
     
  17. Kiko12

    Kiko12 Ace Pilot

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  18. Heat

    Heat Ace Pilot

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    Here's a modified SU-30 that really has a range of speed yet is stable enough to be a trainer. I need to stress the word "modified." 20150801_063050_resized.jpg
     
  19. e3_Scott

    e3_Scott Top Gun

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    Thanks, Peter:)

    Cheers,

    Scott
     
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  20. e3_Scott

    e3_Scott Top Gun

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    Hi Everyone -

    Just back from the field, very successful maiden of my modified Su-30 V4, blasted through 15 flights altogether, got it dialed in pretty much where I want it now:)

    2016-11-28 09.14.25.jpg

    More detailed post flight report and video to follow:cool: Thus far, I give it a big "two thumbs up" (not while flying of course:rolleyes:).

    Cheers,

    Scott
     
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