THE ALPHA JET MK2 -FRCFoamies

Discussion in 'FRCFoamies Plans' started by F1wanabe, Jan 6, 2014.

  1. TomMonton

    TomMonton Administrator

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    Lol...really.

    If you wanted to intentionally create that look, it would have been difficult to do. :D
     
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  2. jwright1943

    jwright1943 Airman

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    after
     
  3. bogusbandit56

    bogusbandit56 Top Gun

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    I have been trying to remember where I seen something like this, now I remember the space ship in the film Serenity.
     
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  4. FlaminJewel

    FlaminJewel Airman

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    I put a 6x3x3 prop on my Alpha Jet and it flew like a lead balloon. What am I doing wrong?
     
  5. bogusbandit56

    bogusbandit56 Top Gun

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    Have you tried it with an apc 6x4 first? They are more aggresive than the 3 bladed prop and the Alpha is slow due to the biplane lay out. Also have you checked the prop isnt on backwards? Greg can sort you out for sure. Best of luck.
     
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  6. F1wanabe

    F1wanabe Administrator

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    Yes, the 3 blade props are easy to reverse! I've got the 6x4x3 master Airscrew prop on the mig 2.88 and it's fast, but a 6x3x3 is less aggressive so it may have less oomph. What motor?
     
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  7. FlaminJewel

    FlaminJewel Airman

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    Nooo. The prop is not on backwards. Give me some credit.
    My first attempt was with a 6x5.5E APC prop. Before I even tried to launch it, I could tell I didn't have enough thrust. I have a Grayson Hobby Super MegaJet V2 & GH 50A w/BEC ESC. The motor is rated at 20K RPM. Oh yeh, I did use a 6x4x3 prop.
    I'm not sure what the plane weighs because I don't have a scale.
     
  8. F1wanabe

    F1wanabe Administrator

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    Well, I always have to double check myself with the triple blade props because they are not as pitched as say, an apc. If the smjv2 isn't pushing it, and your prop is right then your plane must be in the high 20 oz range. That won't want to fly. What foam did you use?
     
  9. bogusbandit56

    bogusbandit56 Top Gun

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    What battery are you using. Checked to make sure you have full throttle on your TX . Syncronized your ESC and throttle?
     
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  10. F1wanabe

    F1wanabe Administrator

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    Yes, that's a good point, bogusbandit! You should set throttle range with any new esc. Also, the c rating of a battery should be 35c minimum for a smjv2 for full Power. If you have a 20c, for example, you probably won't get full power. These are all things we point to in order to try to help you diagnose, these are in no way criticisms
     
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  11. FlaminJewel

    FlaminJewel Airman

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    Didn't know about syncing the ESC. Battery is Zippy Compact 1500mAh 35C 3cell. Wait a minute. I thought some of were using 2cell batteries?
    I welcome the constructive criticism. But a far as my day went yesterday at the field, I was ready to give up on building, sell all my supplies, and go buy an ARF. images (1).jpg
     

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  12. F1wanabe

    F1wanabe Administrator

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    Where are you flying lately? Maybe I can meet you and help you get the alpha jet going.
     
  13. FlaminJewel

    FlaminJewel Airman

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    We went back to LVRCS. The field dried up, but they had to plant grass seed where the water was. Also, my truck is in the shop. It won't be until later in the week.
    I thought about trying a 7" prop, but it won't fit unless I re-cut the foam and re-position the motor. But I don't know what I did because the motor mount is too far aft.
     
  14. F1wanabe

    F1wanabe Administrator

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    Well, I'll be out of town over the weekend but if I don't have to work Saturday am maybe I can meet you there?
     
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  15. FlaminJewel

    FlaminJewel Airman

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    Ok. Let me know.
     
  16. chris_tall

    chris_tall Top Gun

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    I changed mine to the slo-fly prop setup.

    A 2S (2 cell) battery and a 7x3.8 prop on a 2700kV motor.

    The prop fits without any cutting.
     
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  17. F1wanabe

    F1wanabe Administrator

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    Yes, we designed it to accept a 7 inch prop without modifications!
     
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  18. bogusbandit56

    bogusbandit56 Top Gun

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    NO, Dont give up the guys on the forum will get you going, we don`t like quitters:)
     
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  19. Airflow

    Airflow Top Gun

    O'Yes!! A 7x4 makes the Alpha Jet!! Mk2 7x4 Maiden.
    720P at vimeo only two clicks away.
     
  20. bogusbandit56

    bogusbandit56 Top Gun

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    Fantastic flying , Lars , if I keep watching your videos I may have to give up:)
     
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FRCFoamies Plans FRCFOAMIES ALPHA JET MK1 Apr 24, 2012

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