Re: CEF speed contest anyone?

roddie Sat Nov 09, 2013 12:51 pm

no restrictions on propellers?

JPvelo Sat Nov 09, 2013 1:02 pm

roddie wrote:no restrictions on propellers?

Nope.

JPvelo Sat Nov 09, 2013 1:15 pm

pkrankow wrote:Could call it a diesel conversion class. Swing bigger prop so more potential thrust. Steeper pitch is needed or it won't go any faster than the theoretical screw speed at the unloaded limit. Bigger stunt ships use this concept to slow the downhill portion of maneuvers.

Video is probably the best way.

Phil

I would rather keep it glow.

Jim

roddie Sat Nov 09, 2013 2:20 pm

This should be planned for the 1st weekend in April... and titled "The April Fools Speed Event" Airplane

Northern weather should be mild by then.

**Cribbs74** Sat Nov 09, 2013 2:27 pm

Any restrictions in props?

I have some 4.5x7 props, but I doubt everyone has those.

ian1954 Sat Nov 09, 2013 2:41 pm

Oh dear!

I had better put these away again. Sad

CEF speed contest anyone? - Page 2 Diesel10

ian1954 Sat Nov 09, 2013 2:53 pm

How about electric?

It is like glow - they both need batteries!

CEF speed contest anyone? - Page 2 Electr10

JPvelo Sat Nov 09, 2013 6:33 pm

Cribbs74 wrote:Any restrictions in props?

I have some 4.5x7 props, but I doubt everyone has those.

No restrictions, will a reedie spin those without bogging down?

Jim

pkrankow Sat Nov 09, 2013 6:46 pm

JPvelo wrote:
Cribbs74 wrote:Any restrictions in props?

I have some 4.5x7 props, but I doubt everyone has those.
No restrictions, will a reedie spin those without bogging down?

Jim

Eventually it will move fast enough to unload... or run out of fuel.

Phil

**RknRusty** Sat Nov 09, 2013 7:17 pm

Is the elevator set for minimal throws, like maybe 5 deg. up and 5 deg. down?
Jim, should we start a new thread for our technical discussions?
Rusty

JPvelo Sat Nov 09, 2013 7:33 pm

RknRusty wrote:Is the elevator set for minimal throws, like maybe 5 deg. up and 5 deg. down?
Jim, should we start a new thread for our technical discussions?
Rusty

I would set the elevator that way and maybe have only a half elevator like most speed planes. Each pilot can set up their plane however they want though. I would like this yo be a designers contest just as much as an engine contest.

I like the separate thread idea. Maybe a side bar with the rules and sign up like Jason suggested and then a tech thread.

Jim

JPvelo Sat Nov 09, 2013 7:57 pm

roddie wrote:This should be planned for the 1st weekend in April... and titled "The April Fools Speed Event"

Northern weather should be mild by then.

April is good but we need about a two week official flight window to compensate for weather nation/world wide.

Jim

**Cribbs74** Sat Nov 09, 2013 10:57 pm

JPvelo wrote:
Cribbs74 wrote:Any restrictions in props?

I have some 4.5x7 props, but I doubt everyone has those.
No restrictions, will a reedie spin those without bogging down?

Jim

Don't know Jim, never tried one I just have them laying around. I'll get back to you...

JPvelo Sat Nov 09, 2013 11:31 pm

Cribbs74 wrote:
JPvelo wrote:
Cribbs74 wrote:Any restrictions in props?

I have some 4.5x7 props, but I doubt everyone has those.
No restrictions, will a reedie spin those without bogging down?

Jim
Don't know Jim, never tried one I just have them laying around. I'll get back to you...

I was doing a little perusing of small diameter high pitch props online today, my do a some experimenting of my own.

Jim

Kim Sun Nov 10, 2013 3:59 am

I could see this as a Fun Excuse to build a couple Musciano/Scientific Models. I'll admit stupidity up-front in that I'm not sure just how to calculate the area of a tapered wing, so I might need some help in crunching the numbers to make sure they're legal.
Figure that it's also possible that some of the Scientific Models fans have already done this for specific models.

Also, would wheel fairings be allowed if they exist on the full-scale...say...a Cassutt Racer?

OVERLORD Sun Nov 10, 2013 5:06 am

Kim,

If you can find out the wing area of the 1:1 model, and you know the scale you're building, then the answer is readily available, isn't it?

Lieven

JPvelo Sun Nov 10, 2013 5:53 am

Kim wrote:I could see this as a Fun Excuse to build a couple Musciano/Scientific Models. I'll admit stupidity up-front in that I'm not sure just how to calculate the area of a tapered wing, so I might need some help in crunching the numbers to make sure they're legal.
Figure that it's also possible that some of the Scientific Models fans have already done this for specific models.

Also, would wheel fairings be allowed if they exist on the full-scale...say...a Cassutt Racer?

If the full scale has wheel fairings then yes.

Jim

Kim Sun Nov 10, 2013 5:54 am

True...if it were exact scale...which I'm sure is the case with some models/kits. I'm probably over thinking it, as I tend to do with lots of things in the early morning !!

pkrankow Sun Nov 10, 2013 6:58 am

Trapezoidal method works well. Divide the wing into convenient trapezoids then crunch those areas.

Phil

**RknRusty** Sun Nov 10, 2013 8:39 am

Here is a great resource for calculating wing things:

http://www.airfieldmodels.com/information_source/math_and_science_of_model_aircraft/formulas/straight_tapered_and_delta_wing_area.htm

Here's another:

http://adamone.rchomepage.com/

**RknRusty** Sun Nov 10, 2013 8:42 am

Kim wrote:I could see this as a Fun Excuse to build a couple Musciano/Scientific Models. I'll admit stupidity up-front in that I'm not sure just how to calculate the area of a tapered wing, so I might need some help in crunching the numbers to make sure they're legal.
Figure that it's also possible that some of the Scientific Models fans have already done this for specific models.

Also, would wheel fairings be allowed if they exist on the full-scale...say...a Cassutt Racer?

Our speedsters have to be profile, right? Are any Muciano planes profile? The fastest thing I ever built prior to the Tee Dee/Satan was a Musciano Little Devil hollow log.

JPvelo Sun Nov 10, 2013 8:48 am

RknRusty wrote:
Kim wrote:I could see this as a Fun Excuse to build a couple Musciano/Scientific Models. I'll admit stupidity up-front in that I'm not sure just how to calculate the area of a tapered wing, so I might need some help in crunching the numbers to make sure they're legal.
Figure that it's also possible that some of the Scientific Models fans have already done this for specific models.

Also, would wheel fairings be allowed if they exist on the full-scale...say...a Cassutt Racer?
Our speedsters have to be profile, right? Are any Muciano planes profile? The fastest thing I ever built prior to the Tee Dee/Satan was a Musciano Little Devil hollow log.

Yep, profile. Full rules are at the bottom of the first page of the thread.

Jim

Kim Sun Nov 10, 2013 10:55 am

RknRusty wrote:
Kim wrote:I could see this as a Fun Excuse to build a couple Musciano/Scientific Models. I'll admit stupidity up-front in that I'm not sure just how to calculate the area of a tapered wing, so I might need some help in crunching the numbers to make sure they're legal.
Figure that it's also possible that some of the Scientific Models fans have already done this for specific models.

Also, would wheel fairings be allowed if they exist on the full-scale...say...a Cassutt Racer?
Our speedsters have to be profile, right? Are any Muciano planes profile? The fastest thing I ever built prior to the Tee Dee/Satan was a Musciano Little Devil hollow log.

I'll have to look. I THOUGHT there was a Mustang and Cassutt Racer that were profile. There is, for sure an Aracobra that is profile but has a built-up wing.
Still, even if the original was a hollow log, you might be able to use the plan sheet to make up a profile fuse...

pkrankow Sun Nov 10, 2013 7:34 pm

Just open it up to profile and full fuse.

Phil

Kim Sun Nov 10, 2013 7:46 pm

Sorry, didn't mean to muddy the waters...just thinking out loud. The profile plan will keep it fair and square...

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