Step 2, Build Magnum!!

190 posts in this topic

Posted

On to the paint booth for the fuselage! No more fabric or tape to install! Whew..........

Photo Mar 09, 16 47 56.jpg

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Posted (edited)

Looking good Barry!

Leni,  I am never against experimenting - I don't have any info that says the flat plates help STOL better than other tips.   It certainly wouldn't help if it makes the wings shorter by 2 regular tip-lengths.  I have studied this subject a lot, and believe the most important thing for STOL is wing area, profile, and VGs.   The short-wing Pipers proved that squared Hoerner-style tips helped them get off the ground quicker than the round tips because it added wing area.  I would like to see some positive results comparing the flat plates with other tips on the same plane, same wings.  When someone asks my opinion, I give it.  That's all there is to this.  

Remember the Kitfox with the Big Radial engine?  Guess that was them Experimenting with sales back then - so what are they doing now with the STi?   I hear that it has a thicker rib for more lift which would give better STOL disregarding the tips.

 EDMO

Edited by EDMO

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Posted

Ed,

I may agree with you on the KF tips.  The Avid tips that are actually turned up a bit at the trailing edge suck.  If you ever flew close formation with an avid you would know what I am talking about.  The vortices that come off these wings will damn near roll the trailing plane over if you are not ready for it.  The tips on an avid are really not like a full rib in area.  If you don't have evidence to support what they may do to help then why be so against it?  AS I have said many times before, when I was experimenting with tip designs on my RC models, the flat plate tips did the most good for slowing flight and lessening tip stall tendencies. 

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Posted (edited)

Ed,

I may agree with you on the KF tips.  The Avid tips that are actually turned up a bit at the trailing edge suck.  If you ever flew close formation with an avid you would know what I am talking about.  The vortices that come off these wings will damn near roll the trailing plane over if you are not ready for it.  The tips on an avid are really not like a full rib in area.  If you don't have evidence to support what they may do to help then why be so against it?  AS I have said many times before, when I was experimenting with tip designs on my RC models, the flat plate tips did the most good for slowing flight and lessening tip stall tendencies. 

Leni,  I am all for tip experiments.  I hope that someone can give some actual measured comparisons of same plane, same pilot, same weight, same winds, and at least two different tips.  Sounds like the Avid (Finch?) tips that turn up at trailing edge do a better job of shedding the vortexes cleanly away from the wings, making them stronger, (what they are designed for), which should help the performance of that plane even though it affects the one behind it.  Maybe they are not the best for formation flying?  EDMO

Edited by EDMO

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Posted

Ed & Leni,

Im going to move this conversation over to the  Avid General Hangar to get some more input and keep us from polluting Barry’s post any more than we already have...

Ron

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Posted

Ed & Leni,

Im going to move this conversation over to the  Avid General Hangar to get some more input and keep us from polluting Barry’s post any more than we already have...

Ron

I thought this conversation started with Barry's Magnum?  Anyway, I am done writing about this.  EDMO

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Posted

Fitting up boot cowling, floor pan and windshield.

Photo Mar 14, 20 06 44.jpg

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Posted

Been gluing and fiberglassing boot cowling on. Windshield is drilled. Put first stripe on a wing today.

Photo Mar 19, 18 30 29.jpg

Photo Mar 19, 18 32 09.jpg

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Posted

Fitted floor boards tonight, what a poor design.

Photo Mar 20, 21 45 29.jpg

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Posted (edited)

now that looks nice I wish my fiberglass work looked that good. It took me hrs to get my cowl laid up and look some what decent. 

Edited by TJay

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Posted

Thanks, it is a very labor intensive process for sure.

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Posted

Today was engine and landing gear installation so I can fit the front cowling to the boot cowlings.

Photo Apr 02, 14 29 22.jpg

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Posted

Man you are moving a long with your project. Looking good.

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Posted

Thanks Paul.

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Posted

Got firewall installed today along with brake lines.

Photo Apr 09, 19 15 07.jpg

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