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Increase in gross weight for old 701

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msherman95632(at)yahoo.co
Guest

Posted: Sun Aug 19, 2007 12:14 pm Post subject: Increase in gross weight for old 701

Subject:    early 701 to 1025 gross

From:    Tom Flanagan (flanagan(at)nycap.rr.com)

Date:    Sun Aug 19 - 8:23 AM

What modifications are required to change an earlier model to the 

higher  gross , or can,t this be done if the plane is already N numbered ?   

Tom.

You can change the gross weight to what ever you want.  You will need to

change the load factor in your POH.  I have the old kit and have made

most of the changes to the SP, but not all.  What I have done is, using

Chris's calculations on the drawings, I will be using an 1100 lbs gross

weight with a load factor of +3.5 and -1.7.  Rather than the +4 and -2.

This will give me the same load on the aircraft.

Mark S.

701/912ULS

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psm(at)ATT.NET
Guest

Posted: Sun Aug 19, 2007 1:55 pm Post subject: Increase in gross weight for old 701

Hi Mark,



I wonder if you are covering all the issues by merely adjusting the 

load factors.  It seems to me there might be other impacts to 

changing the maximum gross weight besides ultimate loads.  For 

instance, you might change the way CG changes impact the plane's handling.



I think it might be appropriate to go through a complete phase 1 

flight test program after making the gross weight change.  This would 

examine the entire flight envelope and characterize the behavior of 

the newly limited plane.



Paul

XL fuselage

At 01:12 PM 8/19/2007, you wrote:

 	  Quote: 	
		  You can change the gross weight to what ever you want.  You will need to

change the load factor in your POH.  I have the old kit and have made

most of the changes to the SP, but not all.  What I have done is, using

Chris's calculations on the drawings, I will be using an 1100 lbs gross

weight with a load factor of +3.5 and -1.7.  Rather than the +4 and -2.

This will give me the same load on the aircraft.

Mark S.

701/912ULS

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msherman95632(at)yahoo.co
Guest

Posted: Sun Aug 19, 2007 9:49 pm Post subject: Increase in gross weight for old 701

Hey Paul,

 

The CG stays the same and so does the CG limits.  This is the same aircraft, the only changes in the SP are some thicker attach points and gussets, so that it can handle the higher gross weight with the same G's as the old model.

 

Its like some aircraft that have one gross weight for normal flying and another for aerobatic flight.

 

If I fly with a gross weight of 960 lbs I will still be able to pull +4 and -2 G's.  Also if went on a diet and lost a hundred pounds and went up with the fuel tanks half full I could pull +5 G's.  And still only put the same stress on the aircraft as in the original configuration.

 

My aircraft will have the same load on it at 1100 lbs gross at +3.5 and -1.7, as it will at 960 lbs gross at +4 and -2 G's.

 

The calculations for all of this is on Zenith's drawings, dated 06/2001, drawing 7-G-3.  A list of all of the updated parts for the SP are on drawing 7-G-2.

 

 

Not much of a penalty of G's for a good increase in gross weight.

 

Mark S.

701 912ULS

---

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zodierocket(at)hsfx.ca
Guest

Posted: Mon Aug 20, 2007 7:40 pm Post subject: Increase in gross weight for old 701

Let me add more to this, I have just been working on a 14yr old 701 and

bringing portions of it up to today's standard. I will be lowering the G

rating to get it to register at 1100 lbs. Nevertheless, I have also been

updating all parts to the newest set of plans for peace of mind. Though

there is about 30 different changes for the present day 701SP I have

found about 10 parts in the tail alone that are now different

thicknesses, this required the complete disassembly of the horizontal

tail and elevator. None of these parts are part of the SP upgrade, they

are just changes over the years. I have also pulled the whole firewall

and changed every part, just to be in line with the new drawings. So if

your considering changing the gross, pull out your calipers and go over

most of your plane and see if you really want to change the gross. I

know I will not do this again, but alas, I am too far into it now to

stop, plus I don't give up very easily( wife say's stubborn, I just say

determined). Next on my list is to gut the whole fuselage behind the

seats and remove the metal cage in the cabin. These are part of the SP

update. I have already removed the header tank and panel. Next is the

wings and new spars with wing fuel tanks. 



Next time I will build a kit and move the motor and panel over, it will

be a lot faster, and a hell of a lot cheaper if I was counting my time.



Mark Townsend

Can-Zac Aviation Ltd.

president(at)can-zacaviation.com

www.can-zacaviation.com 



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