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Custom non STOL Elevator for CH 701

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martyn(at)flight.co.za
Guest

Posted: Mon May 08, 2006 2:31 am Post subject: Custom non STOL Elevator for CH 701

Hello All,



We're waiting for our plans to arrive, and so as yet we have not started

building our plane. However, here in Johannesburg, South Africa, we are

about 6000 ft ASL. And the STOL performance figures quoted on the Zenith

site for the 701 will be very different up here.



I have heard from a 701 bulder here in South Africa, that the STOL

capabilities are a bit of an Overkill for South African flying conditions.

And that with the inverted elevator design, in a power off situation, the

nose tends to dip quite a lot.



So my question is this, Is it possible to Invert the inverted elevator?

What I mean to say, can we take the original elevator and invert it so

that the camber is on top! Thus making it a more traditional elevator?



Second question,



The leading edge slats are fixed, now, if i was to say, place the slats

flush with the wing, will that then give me the original NACA wing profile

that Chris Heintz used for this wing or is the NACA wing profile made up

of the Wing, the Slat and the Gap between the two?



Any comments and help will be greatly appreciated. I'm so looking forward

to starting on this plane. I've just gotta learn to be patient!



Kind Regards



Martyn Ward

www.Flight.co.za

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Max Johansson

Joined: 09 Jan 2006
Posts: 25
Location: Helsinki, Finland

Posted: Mon May 08, 2006 3:39 am Post subject: Custom non STOL Elevator for CH 701

Martyn



1. According to conventional thinking the upside-down elevator 

is really there to prevent nose-dipping when using the 701 

STOL capabilities. For a regular plane a flat horisontal tail 

surface with a hinged elevator is enough to balance the aircraft.



2. In normal flight the 701 slat gap is not having an effect so 

the profile is the overall profile. The gap geometry is rather 

critical to adjust. The Pegastolg wing emplys moving slats in 

order to have it both ways. 



rgrds, Max, do not archieve 

[quote] --

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_________________
Max

Max Johansson, Helsinki, Finland
Building a CH701SP-912S
on CZAW amphibian floats

bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Mon May 08, 2006 5:25 am Post subject: Custom non STOL Elevator for CH 701

The horizontal stabilizer on most aircraft has little or no camber, they use symmetrical airfoils or even flat surfaces. Remember, on a conventionallly configured airplane, the horizontal tail pulls down on the tail not up, so you would definitely not want the camber on the top. The inverted camber on the 701 allows the tail to provide more negative lift at very slow speeds in order to keep the nose up in slow flight.

 -------------- Original message ----------------------

From: martyn(at)flight.co.za

 	  Quote: 	
		   

 

 Hello All,

 

 We're waiting for our plans to arrive, and so as yet we have not started

 building our plane. However, here in Johannesburg, South Africa, we are

 about 6000 ft ASL. And the STOL performance figures quoted on the Zenith

 site for the 701 will be very different up here.

 

 I have heard from a 701 bulder here in South Africa, that the STOL

 capabilities are a bit of an Overkill for South African flying conditions.

 And that with the inverted elevator design, in a power off situation, the

 nose tends to dip quite a lot.

 

 So my question is this, Is it possible to Invert the inverted elevator?

 What I mean to say, can we take the original elevator and invert it so

 that the camber is on top! Thus making it a more traditional elevator?

 

 Second question,

 

 The leading edge slats are fixed, now, if i was to say, place the slats

 flush with the wing, will that then give me the original NACA wing profile

 that Chris Heintz used for this wing or is the NACA wing profile made up

 of the Wing, the Slat and the Gap between the two?

 

 Any comments and help will be greatly appreciated. I'm so looking forward

 to starting on this plane. I've just gotta learn to be patient!

 

 Kind Regards

 

 Martyn Ward

 www.Flight.co.za

- The Matronics Zenith-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

ggower_99(at)yahoo.com
Guest

Posted: Wed May 10, 2006 8:30 pm Post subject: Custom non STOL Elevator for CH 701

Hello Martyn,

   

  Welcome to the list,  Please NO!

   

  I fly from 5,000 to 7,200 ft ASL  strips here and the 701 flys PERFECT.

   

  Please DONT MODIFY ANY airplane unless you are qualified to do it...   Dont pay atention to "hangar experts"   dont get killed and damage the image of a great airplane and the Sport just because one smart guy  opinion.

   

  I once heard:  You want to make an airplane designer have a heart attack?  Modify his design     

   

  I will advice you:  Before building ANY airplane,  learn and read all possible literature from "secure" source and if possible get a test flight and or some videos of the airplane.

   

  The 701 is just perfect as designed, for the intendend way to fly.    No need a STOL airplane?, or want a faster one?  Or you have good landing strips?, then chose another airplane....  the 601 for example.

   

  Hope this helps,   not mad at all, just frightened that you can get hurt...  No ofence intended.  

   

  And yes, all newbie builders (I was one of  them 20 years and 3 projects ago). think that they are smarter than any designer...   Every modification  for simple as it looks can ADD  about 100 hrs to the building time of the project...  been there done that...

   

  Saludos

  Gary Gower

  701 912S  

  Flying from Chapala, Mexico 

     



martyn(at)flight.co.za wrote:

  



Hello All,



We're waiting for our plans to arrive, and so as yet we have not started

building our plane. However, here in Johannesburg, South Africa, we are

about 6000 ft ASL. And the STOL performance figures quoted on the Zenith

site for the 701 will be very different up here.



I have heard from a 701 bulder here in South Africa, that the STOL

capabilities are a bit of an Overkill for South African flying conditions.

And that with the inverted elevator design, in a power off situation, the

nose tends to dip quite a lot.



So my question is this, Is it possible to Invert the inverted elevator?

What I mean to say, can we take the original elevator and invert it so

that the camber is on top! Thus making it a more traditional elevator?



Second question,



The leading edge slats are fixed, now, if i was to say, place the slats

flush with the wing, will that then give me the original NACA wing profile

that Chris Heintz used for this wing or is the NACA wing profile made up

of the Wing, the Slat and the Gap between the two?



Any comments and help will be greatly appreciated. I'm so looking forward

to starting on this plane. I've just gotta learn to be patient!



Kind Regards



Martyn Ward

www.Flight.co.za



		

---------------------------------

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jean-paul.roy4(at)tlb.sym
Guest

Posted: Thu May 11, 2006 2:33 am Post subject: Custom non STOL Elevator for CH 701

Very wise advise here



Jean-Paul Roy

do not archive

---

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