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  1. #576

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    RE: Boomerang Sprint Build Thread!

    they are very nice gear and look the best. little pricey but worth it.. and you can get any part you need later on. they stock them all...

  2. #577

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    RE: Boomerang Sprint Build Thread!

    Ya, I have decided to use the gear set from Dreamworks.
    Graham

  3. #578

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    RE: Boomerang Sprint Build Thread!

    hello dave did the p 80 fit with no modification. just curious.. was buying a p70 but may decide to get the p80 instead.... thanks pat

  4. #579

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    RE: Boomerang Sprint Build Thread!

    Yes, straight in. It's designed with the p80 in mind.
    Dave Bright - http://www.wimbornemac.org

  5. #580

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    RE: Boomerang Sprint Build Thread!

    hello dave great to know this. i have a p70 mount in it right now. will the p 80 mount be the same as the p70 mount . i would like to use the same holes ..pat

  6. #581
    KC36330's Avatar
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    RE: Boomerang Sprint Build Thread!

    ORIGINAL: ricardinho

    ...........i have a p70 mount in it right now. will the p 80 mount be the same as the p70 mount . i would like to use the same holes ..pat

    No.

  7. #582

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    RE: Boomerang Sprint Build Thread!

    Hi,

    You may want to read post 404 in this thread. It was also mentioned in some earlier threads about the clearence being to tight without the modifacation. Using the P-80 mount, I added the 3/8" hardwood spacer on both sides and it is perfectly centered. I did do a trial fit before the final install. I used 30 min. epoxy instead of CA for a stronger support. Also, be sure to apply BVM Heat Shield back there both in the fuse and the turdle deck. Weight is not an issue.

    Doc...
    \"Never give up, Life is to short\"

  8. #583
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    RE: Boomerang Sprint Build Thread!

    Without looking at my P-80 installation, isn't the P-80 mount offset. Can it be rotated 180 degrees to give a centered fit? Mine seems as if centered with out the additional hardwood rails. I may also have a different P-80 mount than others. The Boomerang seems a few pounds heavier than my Shockjet taking into consideration the Shockjet has a P-60 and half the fuel capacity. What are most of you guys having to do with CG on the Boomerang? Are you having to move batteries or add weight to get it on or near the CG? I cut up BVM insulation and installed, added aluminum tape over that and then painted the inside of the turtle deck with heat shield to manage the heat from the business end of the P-80. The combination of all three will do the job to keep the turtle deck cool.

    MACE
    Peace Is That Brief Glorious Moment In History When Everybody Stands Around... Reloading

  9. #584
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    RE: Boomerang Sprint Build Thread!


    ORIGINAL: Mace

    ...............isn't the P-80 mount offset. Can it be rotated 180 degrees to give a centered fit?

    all the JetCat mounts are offset and require the 3/8" shim, flipping the mount will only offset the turbine 3/8" high rather then low.

  10. #585

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    RE: Boomerang Sprint Build Thread!

    Hi Guys,

    Anyone using crow on the Sprint? I messed about with it yesterday and found that with 60%mix reflex and full 90degree is like hitting a wall. Needed half power to stop it from falling. Reduced reflex to 30% and full landing flap to about 75degree and had a much more predictable landing approach with around 1/3rd throttle. I don't think this design needs crow with that flap, but it's good to be able to come in on power so if it's needed, the throttle is more lively to go round again.

    At our field we've decided the CG is very safe (nose heavy) as per manual, Inverted flight needs a lot of down elevator. I've moved my turbine to the back of the mounting rails, and will now move receiver packs aft too.

    Be interested to hear other users thoughts.
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    Dave Bright - http://www.wimbornemac.org

  11. #586

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    RE: Boomerang Sprint Build Thread!

    hello dave i have the full flap with crow on my sprint. i wont land it without it . its nice because you can come in with good power on so its already spooled . always remember though not to come in with the nose up with crow. the sink rate is considerable. i carry about a quarter throttle with the nose down slightly. keeps the airspeed perfect. i have two settings for flaps. one normal rate with no crow and full flap with crow. as i said before though you will need to mix down elevator for the full flap with crow. on a few posts back i show my plane with the full crow position. i was reading post on here some people were saying you dont need flaps . i dont agree. with the full flap crow you can come in very slow keeping your ground speed to a minimum for roll out. means less brakes... glad to see someone else using crow... pat

  12. #587

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    RE: Boomerang Sprint Build Thread!

    Hi,

    I feel using the flaps is a good thing because of using power durning landing. Some posts back said the mix 30% down elev with the flaps. I understand that because once the flaps are deployed, without the mix, the nose wants to go up. So, could you explain crow. I'm due for my maiden in about 2 weeks.

    Thanks,

    Doc...
    \"Never give up, Life is to short\"

  13. #588

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    RE: Boomerang Sprint Build Thread!

    hello doc. i dont know the exact settings for it. i bought the plane from my friend and we just did a data transfer on my 9303 2.4. ok maybe this will help. i have two rates for flaps . on the first rate the flap will come down about 45% with a slight bit of down elevator . you will have to play with it until the plane doesnt ballon anymore. when i go to full flap is when the crow is activated. the elevator will go down a little further along with about a quarter inch of up ailerons.. i only go for the full flap with crow when i land. i dont mess with the low rate flap. soon as i turn on the down wind i level the plane and go full flap. the plane becomes a big ***** cat. very stable. no ballooning at all. just keep your throttle up a little as you turn on base with the nose slightly down. the plane will come down like its in slow motion. unreal how stable. you will like it . you dont need a long roll out. just play with the mixes until you get the elevator set right.. hope this helps.. pat

  14. #589

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    RE: Boomerang Sprint Build Thread!

    Hi Pat,

    OK. I didn't know about the ailreons. Your right. I will have to play around with it. Thanks,

    Doc...
    \"Never give up, Life is to short\"

  15. #590
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    RE: Boomerang Sprint Build Thread!

    Hello

    Yes pitch changes slightly on mine too but with variations in airspeed, not thrust. Mine is also set up as per the manual CG but for inverted I only need a touch of down.

    Paul

    P.S. Managed 325 km\h yesterday
    Dont talk to me about props. I dont care I dont want to know!!!

  16. #591
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    RE: Boomerang Sprint Build Thread!

    Hi all

    My Sprint is mounted with an oversize turbine (15 kg, 33lbs), and I think I need to turn it down a bit, in order not to destroy the jet. What is the largest thrust-sizes that you fly with?? Is 12 kg (27lbs) still to much?

    How does your Sprint’s perform in a side-wind landing? Are you just applying sufficient ruder, to make it fly straight, or how?
    Flying greetings, Lars R \"Slow Builder\"

  17. #592

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    RE: Boomerang Sprint Build Thread!

    Pretty sure max for this aiframe is p80 sized, so around 20lbs. I flew in a 10mph cross wind yesterday and the sprint was unaffected. The wind did swing around more for my final flight, but a touch of the big rudders kept it straight.

    I've also sorted my crow. Full landing flap is around 70degrees with approx 5degrees reflex. Landing flap needs a small down elev mix, comes in on 1/3rd power. Once I'm over our fence line, cut the power and she comes in nicely. Each flight i'm moving my CG back, but am really starting to enjoy flying it now.

    Thanks to JonT for photos....
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    Dave Bright - http://www.wimbornemac.org

  18. #593
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    RE: Boomerang Sprint Build Thread!

    I flew mine in a very strong crosswind, the sprint is not very much affected by it. I dont use rudder, I just come in at a crab angle and just before touchdown I de-crab it with the rudder. Thats how we do it in full size.

    Paul
    Dont talk to me about props. I dont care I dont want to know!!!

  19. #594

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    RE: Boomerang Sprint Build Thread!

    i havent had a strong crosswind yet with my sprint but the way you explained is the way i always flew my giant areobatic planes.

  20. #595

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    RE: Boomerang Sprint Build Thread!

    paul sorry about bringing up prop planes. i see you dont want to here about them hahaha.. i feel the same about them also..take care

  21. #596
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    RE: Boomerang Sprint Build Thread!

    Props [:'(]
    Dont talk to me about props. I dont care I dont want to know!!!

  22. #597

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    RE: Boomerang Sprint Build Thread!

    Whats a prop??????????????????????

    \"Never give up, Life is to short\"

  23. #598

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    RE: Boomerang Sprint Build Thread!

    props are for boats!!!!!!

  24. #599

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    RE: Boomerang Sprint Build Thread!

    Holy crap...33lbs!

    I have a falcon in mine 21-22lbs or so... and i can go from lift off to straight vertical (full fuel) with my falcon...

    Make sure you post pictures when you rip your wings off..lol i have never seen a boomer blow apart in the air, but 33lbs should do it.

    OR..... sell your sprint and put that big monster in a Boomer XL...

    I personally think the falcon (21# or so) is the perfect match for the Sprint.

    Lawrence
    LT Dorn-Boomer Sprint - Artes Falcon
    Innovation, creativity and hard work makes us progress!

  25. #600
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    RE: Boomerang Sprint Build Thread!

    Thanks for your reply's concerning thrust and croswind
    Flying greetings, Lars R \"Slow Builder\"


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