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CEF speed contest Design Discussions (2014)
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Re: CEF speed contest Design Discussions (2014)
JPvelo wrote:pkrankow wrote:OK, does a "tandem" wing aircraft fall under biplane rules? The span of the forward and aft wings are nearly the same.
Phil
Go for it!!
Sounds like fun!
Alright. I might have to. 12.5 inch wingspan sounds pretty nice!
Problem is the example I am looking at has fixed LG AND wing struts... just added drag. I could omit the struts I suppose.
Phil
pkrankow- Top Poster
- Posts : 3025
Join date : 2012-10-02
Location : Ohio
Re: CEF speed contest Design Discussions (2014)
Greetings JPvelo! I really like your model .... it's sooooo kool! I would like to know where you got your wheels from or if you made them, just how did you do it because I'l like to acquire 3 or 4 sets for my "little birds".JPvelo wrote:Mike,
I plan on using an external bladder secured through the spring end of a safety pin.
Jim Carter
modelbuilder49- Gold Member
- Posts : 290
Join date : 2013-09-12
Age : 75
Location : Titusville Florida
Re: CEF speed contest Design Discussions (2014)
modelbuilder49 wrote:
Greetings JPvelo! I really like your model .... it's sooooo kool! I would like to know where you got your wheels from or if you made them, just how did you do it because I'l like to acquire 3 or 4 sets for my "little birds".
Jim Carter
Jim,
Thank you. I believe they are Glenn Lee racing wheels. I put the word out on Stunthanger that I was looking for them and someone came through. It's been long enough ago that I don't remember who it was.
Jim
JPvelo- Diamond Member
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Join date : 2011-12-02
Age : 57
Location : Colorado
Re: CEF speed contest Design Discussions (2014)
Jim,
Thank you. I believe they are Glenn Lee racing wheels. I put the word out on Stunthanger that I was looking for them and someone came through. It's been long enough ago that I don't remember who it was.
Jim[/quote]Okee dokee!
Jim
Thank you. I believe they are Glenn Lee racing wheels. I put the word out on Stunthanger that I was looking for them and someone came through. It's been long enough ago that I don't remember who it was.
Jim[/quote]Okee dokee!
Jim
modelbuilder49- Gold Member
- Posts : 290
Join date : 2013-09-12
Age : 75
Location : Titusville Florida
Re: CEF speed contest Design Discussions (2014)
Google ed it http://www.planethobby.com/collections/vendors?q=glenn+lee There are other sites that have them too , mite get me some Thanks
getback- Top Poster
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Posts : 10442
Join date : 2013-01-18
Age : 67
Location : julian , NC
Re: CEF speed contest Design Discussions (2014)
getback wrote:Google ed it http://www.planethobby.com/collections/vendors?q=glenn+lee There are other sites that have them too , mite get me some Thanks
"sold out"
every return I found was also sold out.
I think adapting a hole saw to use a wire drill, or no center drill (drill press) might allow making something similar out of available plastic sheets.
pkrankow- Top Poster
- Posts : 3025
Join date : 2012-10-02
Location : Ohio
T-33 for Tee Dee
Been working on this for a few days. Just as my Rare Bear; I'm scaling directly from a screen-shot on my laptop.. and eyeballing to a large degree. The nice thing.. is the fuse's profile image I'm working from, is the size of the model.
Laid-up my laminated fuse.. 3mil luan-ply sides with 1/16" balsa sheet in-between.
Laid-up my laminated fuse.. 3mil luan-ply sides with 1/16" balsa sheet in-between.
Re: CEF speed contest Design Discussions (2014)
Before I get too far.. I have a wing-area question. Span is at the 15" mono-plane minimum. The root-chord is 4" and the tip-chord is 2" (symmetrical; root to tip). When I do the math.. this works out to the minimum 45 squares.. right?
Re: CEF speed contest Design Discussions (2014)
Not quite
(15 x 4) - ((7.5 x 1/2) x 4)
less the kerf produced by cutting
assuming 20 thou
(sqrt(7.5 x 7.5) + (2 x 2)) x 4 x .020
44.379033012149599050845501529
(15 x 4) - ((7.5 x 1/2) x 4)
less the kerf produced by cutting
assuming 20 thou
(sqrt(7.5 x 7.5) + (2 x 2)) x 4 x .020
44.379033012149599050845501529
ian1954- Diamond Member
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Age : 70
Location : England
Re: CEF speed contest Design Discussions (2014)
Make some very small wing tips
If you are making profile tip tanks that might add the span you need.
Jim
If you are making profile tip tanks that might add the span you need.
Jim
JPvelo- Diamond Member
- Posts : 1972
Join date : 2011-12-02
Age : 57
Location : Colorado
Re: CEF speed contest Design Discussions (2014)
...or just make the cuts at the outsides of your markings, not in the middle of the line
KariFS- Diamond Member
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Join date : 2014-10-10
Age : 53
Re: CEF speed contest Design Discussions (2014)
Thank You Ian, Jim and Kari... There's gusseting at the leading-edge's root on the full-size airplane, that will add the area I need. The wing-tip pods (which I plan to simulate) will add slightly to both; span and area too.
I'll use those tip-pods to help flight-trim this model. They will be a thin 2D profile shape. The inboard pod will allow ample positioning for a lead-out guide, and the outboard one will be of a heavier material to counter the extra weight on the inboard side. (controls/lines)
I'll use those tip-pods to help flight-trim this model. They will be a thin 2D profile shape. The inboard pod will allow ample positioning for a lead-out guide, and the outboard one will be of a heavier material to counter the extra weight on the inboard side. (controls/lines)
Re: CEF speed contest Design Discussions (2014)
Roddie, did Cox make a jet engine?
Oldenginerod- Top Poster
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Location : Drouin, Victoria
Re: CEF speed contest Design Discussions (2014)
Oldenginerod wrote:Roddie, did Cox make a jet engine?
In the last go-round, I did feel the need to point out that a DynaJet is, indeed, a reed valve engine!
Didn't get very far with that one...
Mike
Re: CEF speed contest Design Discussions (2014)
Oldenginerod wrote:Roddie, did Cox make a jet engine?
No Rod.. but this wouldn't be the first jet model to be built for the speed contest.
Doug (GUS THE I.A.) built this cool A7 for the first contest.
I had considered an F-20 Tigershark.. but decided on the T-33 instead. There was a fan unit designed for the Tee Dee. I don't think it would work well with control-line though. It also wouldn't qualify for this "profile" event.
I think "Kress" made one too. Here's a model with a Bee powered fan unit.
Re: CEF speed contest Design Discussions (2014)
No Rod.. but this wouldn't be the first jet model to be built for the speed contest.
Doug (GUS THE I.A.) built this cool A7 for the first contest.
I think "Kress" made one too. Here's a model with a Bee powered fan unit.
[/quote]
Man!! Now that's jus' downright KOOL!! Ya' done good, real good!
Doug (GUS THE I.A.) built this cool A7 for the first contest.
I think "Kress" made one too. Here's a model with a Bee powered fan unit.
[/quote]
Man!! Now that's jus' downright KOOL!! Ya' done good, real good!
modelbuilder49- Gold Member
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Join date : 2013-09-12
Age : 75
Location : Titusville Florida
Re: CEF speed contest Design Discussions (2014)
modelbuilder49 wrote:No Rod.. but this wouldn't be the first jet model to be built for the speed contest.
Doug (GUS THE I.A.) built this cool A7 for the first contest.
I think "Kress" made one too. Here's a model with a Bee powered fan unit.
Man!! Now that's jus' downright KOOL!! Ya' done good, real good![/quote]
Not mine Jim! I don't know who's model that is with the fan. I save random images that interest me. I really like it though.. because it's Cox powered!
The more I look at it.. the more it looks like a free-flight model..
Re: CEF speed contest Design Discussions (2014)
You know was doing a search yesterday and saw educated fan blades made for cox 049's
rogermharris- Platinum Member
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Age : 61
Location : Long Branch, New Jersey
Re: CEF speed contest Design Discussions (2014)
rogermharris wrote:You know was doing a search yesterday and saw educated fan blades made for cox 049's
"Kress" made fan units for the Tee Dee years ago, having I believe an "RK" designation in the model#. I'll see if I can find a pic.
Re: CEF speed contest Design Discussions (2014)
The "Axiflow" RK-049 was a Kress fan kit that I remember seeing in magazines years ago. I found these images. I don't think it was in production very long.
With all the high performance engine tuning that takes place on this forum.. along with some really skilled builders.. I'd love to see one of these kits utilized. Back when these kits were being made, radio gear was HEAVY.. compared to what it is now.
With all the high performance engine tuning that takes place on this forum.. along with some really skilled builders.. I'd love to see one of these kits utilized. Back when these kits were being made, radio gear was HEAVY.. compared to what it is now.
Re: CEF speed contest Design Discussions (2014)
Now that is cool! I would like to see it on a set of control lines
rogermharris- Platinum Member
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Join date : 2015-03-17
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Location : Long Branch, New Jersey
Re: CEF speed contest Design Discussions (2014)
rogermharris wrote:Now that is cool! I would like to see it on a set of control lines
I suppose it's possible Rog. It would have to be strictly a roundy-round model.. and have a smooth runway for take-off. There's not enough area for any kind of tight turns in a control line circle. I'd still like to see it though. The Dynajet wasn't a stunter either!
Re: CEF speed contest Design Discussions (2014)
Was trying to find video of it flying
rogermharris- Platinum Member
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Join date : 2015-03-17
Age : 61
Location : Long Branch, New Jersey
Re: CEF speed contest Design Discussions (2014)
I had one of those RK-049 fans when I was a kid. If you want to try to fly one control line you's better have a smooth lot to fly from and expect a five-lap take off run! Definately 'top gear' only!
Roddie, I'm really looking forward to seeing your T-33 take shape. Your models are always interesting, well thought out and well built. Cool subject too! I had given some thought to an F-94C for a TeeDee, but I should probably just finish what I've already started...
Post lots of pics!
Mike
Roddie, I'm really looking forward to seeing your T-33 take shape. Your models are always interesting, well thought out and well built. Cool subject too! I had given some thought to an F-94C for a TeeDee, but I should probably just finish what I've already started...
Post lots of pics!
Mike
Re: CEF speed contest Design Discussions (2014)
Mike Mulligan wrote:I had one of those RK-049 fans when I was a kid. If you want to try to fly one control line you's better have a smooth lot to fly from and expect a five-lap take off run! Definately 'top gear' only!
Roddie, I'm really looking forward to seeing your T-33 take shape. Your models are always interesting, well thought out and well built. Cool subject too! I had given some thought to an F-94C for a TeeDee, but I should probably just finish what I've already started...
Post lots of pics!
Mike
Thanks Mike! I saved a 3-view of an F-94C when gathering images for the T-33.
I know all about the finishing what I've already started thing.. It's never too late to get back to something that was put on the back-burner.. or should I say; "after-burner"
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