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  1. #176

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    RE: Fastest Engine


    ORIGINAL: proptop

    Somebody will correct me if I'm wrong, but I think a round tube or wire strut has about 3 or 4 times the drag as a streamlined strut of the same thickness? I think you need something like a 4:1 aspect ratio though? So...a 1/4" thick strut would need to be 1" wide. (approx.)
    I think it is more like 7 or 8 times, but yes, a round strut is about the worst aerodynamic shape you could have. It can also cause resonance and vibration problems due to the vortex shedding coming off of it. Adding a tapered trailing edge would be a huge improvement over nothing. You could also make a fairing the way Goldberg does on their Ultimate bipe and Extra 300 kits, with a piece that slides on from the side and adds a leading and trailing edge.

    Mark
    Waco Brotherhood #4

  2. #177
    Mike Connor's Avatar
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    RE: Fastest Engine

    The drag coefficient increases with speed when using a round shape.
    Attachment form NASA web site.
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  3. #178

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    RE: Fastest Engine

    Some very good info! I love the way you guys think.
    Im gonna make a seperate set of tubes with a shorter length and I will definatly have to do some experimenting with them.

  4. #179

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    RE: Fastest Engine

    Just thought Id show you guys a few pics of my flatbottom with a Jettstream on the 91fx, setup with water rudder. Ive got a topspeed of 56mph with this combo.

    The fuel tank is set for the pictures only, I normaly keep it insualated with foam to help with the vibration.
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  5. #180

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    RE: Fastest Engine

    That looks like a lot of fun Hooty, but I'd rather go 190 in the air
    Dave Norman
    29w

  6. #181
    Lomcevak Duck's Avatar
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    RE: Fastest Engine

    You do good work with wood Hooty. It looks great.

  7. #182

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    RE: Fastest Engine

    Thanks for the kind words Lomcevac Duck.

    Daven wrote:
    That looks like a lot of fun Hooty, but I'd rather go 190 in the air
    I can only imagine the rush[8D]


    Heres some more progress on my rigger, I shortend the boom tubes some in the second pic. Weight is at 1lb 14oz in the first pic a lil more in the others.
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  8. #183

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    RE: Fastest Engine

    I want to thank you guys for helping me select a good engine for my project.

    I went with a 90lx fire.

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  9. #184

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    RE: Fastest Engine

    was it rich?

  10. #185

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    RE: Fastest Engine

    Jetlag wrote:
    was it rich?
    I havent run it yet.

    BTW Mr Jett, this thing is a work of art!


    Thankyou[sm=cool.gif]

  11. #186

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    RE: Fastest Engine

    Wow that thing looks sweet, how has everything been going?? I have got to get some pics posted of my plane that I am working on I will have the other wing put together tonight do you have any pointers about wings??? As I see you have a wing on the back of your boat just how big is it??

  12. #187

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    RE: Fastest Engine

    Hollander101 wrote:
    Wow that thing looks sweet, how has everything been going?? I have got to get some pics posted of my plane that I am working on I will have the other wing put together tonight do you have any pointers about wings??? As I see you have a wing on the back of your boat just how big is it??
    Sorry about the delede response, somehow I missed the post.

    Thanks, glad you like it. Things are going perty good here, how about yourself?

    Im no expert on wings, these guys on here are the pros. Is it a scratch build or kit? The wing on my boat is around 18 inchs in span.

  13. #188

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    RE: Fastest Engine

    Well Im getting perty close to being finished heres a few pics.






  14. #189
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    RE: Fastest Engine

    you know your gonna have to get a video of this thing hauling..dont you
    if your still in control....you aint goin fast enough
    **Revver Bro 95**

  15. #190
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    RE: Fastest Engine

    That's really cool man
    Pretty spiffy (does anybody else still use that word?) engine mount/pylon too[8D]
    < Wrongway Feldman's Kreider-Reisner KR-21...(on Gilligan's Island)

  16. #191
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    RE: Fastest Engine

    ORIGINAL: HaveBlue

    you know your gonna have to get a video of this thing hauling..dont you
    I think that there is a law to that effect in most states that if you build something that looks like it could break the sound barrier, you have to post video on RCU of a speed-run. You don't want to go to jail over this do you Hooty? Also, tell us more about that metal engine mount; is it stainless steel, aluminum?

  17. #192

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    RE: Fastest Engine

    I dont see any control surface for when it leaves the water and wants to be a plane
    Oooh eee oooh ah ah(the crowd) ting tang walla walla bing bang!(the plane crash)

  18. #193
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    RE: Fastest Engine

    I doubt to much of that hull? (fuse with pylons?) will see much water..besides I just want to hear that Jett 90 get on the pipe..take heed, you best included control surfaces for both water and air
    if your still in control....you aint goin fast enough
    **Revver Bro 95**

  19. #194

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    RE: Fastest Engine

    I agree it needs elevons, or at least an elevator

  20. #195

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    RE: Fastest Engine

    Some kind of horzontal control surface placed fore or aft and connected to a gyro would quickly help if the hull's pitch gets out of contol.....or level flight
    Oooh eee oooh ah ah(the crowd) ting tang walla walla bing bang!(the plane crash)

  21. #196

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    RE: Fastest Engine

    Thanks fellows, Ill definatly get some video for you guys.


    think that there is a law to that effect in most states that if you build something that looks like it could break the sound barrier, you have to post video on RCU of a speed-run. You don't want to go to jail over this do you Hooty? Also, tell us more about that metal engine mount; is it stainless steel, aluminum?
    LOL..no I dont wanna go to jail, will post video

    The engine stand is aluminum.

  22. #197
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    RE: Fastest Engine

    I am such a fan of Hooty's work..... way to do BRO. For the video thingy.... I will host it on a dedicated site for you We ALL can see it in the quality it deserves.

    Also when you come to NC for the meet my offers still stands. I'll put you in a 100mph speed boat so you can stretch the legs on your creation.
    Member of the RCAA
    Custom Rudder Works

  23. #198

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    RE: Fastest Engine

    56mph with an air boat might just be the world record! You should look into that.

  24. #199

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    RE: Fastest Engine

    Andy wrote:
    I am such a fan of Hooty's work..... way to do BRO. For the video thingy.... I will host it on a dedicated site for you We ALL can see it in the quality it deserves.

    Also when you come to NC for the meet my offers still stands. I'll put you in a 100mph speed boat so you can stretch the legs on your creation.
    Thanks Andy!

    Cant turn that offer down

    mike wrote:
    56mph with an air boat might just be the world record! You should look into that.
    Ive seen 56mph out of it but it wasnt documented, the fastest documented speed from an airboat so far that I know of is 53.3mph.

    Record run

    [link]http://www.rcairboats.net/Videos/Others/Nitro/Nitro533.wmv[/link]

  25. #200

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    RE: Fastest Engine

    I've been following that thread.

    If you've already gone 56, then you should be able to eek even more speed from it.

    GIT er Done Man! Take that World Record! That's something you can keep forever and not many people can say that.

    I'm gunning for the all out world record for ALL model aircraft.


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