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Mace P-24 Condor
Mace P-24 Condor

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Mace P-24 Condor
Description: I found a distorted plan for the Mace P-24 Condor in a storage cabinet belonging to the Boeing indoor free flight club (known as BEAMS). This plan had been reduced to fit on an 11” by 17” piece of paper. Rather than having Kinkos scale up this distorted plan, I decided to draw it in CAD. I left off the isometric construction views shown on the original plans as they were for novice builders and take a long time to draw in 2D CAD.

All I knew about the P-24 event is that the maximum wingspan and overall length cannot exceed 24 inches, and that a 7” diameter commercially available plastic propeller must be used. To this day, P-24 is not an official AMA event, although I believe it should be.

I was curious as to who started the P-24 event and if this non-AMA event had anything to do with the creation of the Science Olympiad Wright Stuff Event. I tried to contact Don Mace, who used to sell the P-24 Condor and P-18 Hawk plans and kits, but his email address no longer works. I wrote to Bob Stalick, a well-known free flight model airplane enthusiast living in Oregon, to see what he knew about the P-24 event. The following is his reply:

Glad to help. The P-24 class (also P-18) was first proposed by Tom Hutchinson, the designer of the Maverick gas model and many others. Tom lived here in Albany (Oregon) for about 10 years, and was an active club member. The WMC (Willamette Modeler’s Club) sponsored 4 or 5 indoor meets each year and Tom believed it would be a good idea to have a beginner event to compete at our meets. Taking a cue from the success of the outdoor P-30 event, originated by the San Diego Orbiteers, for outdoor, he reasoned that a plastic propeller would be the secret. Other rules were a max dimension of 24" (span and length), Japanese tissue covering only, and the requirement to use a solid wood motor stick. Prop diameter was limited to 7", as I recall. Tom published his model "5 cents Plain" in Model Builder, January 1981 (also available on the Willamette Modeler’s Club web site). We had been flying the event for 4-5 years by then, and he had plenty of experience with it. I think we usually had 4-5 guys flying the event. Times in our 36' gym were in the 3 to 4 min. range. The event eventually morphed into the "Wright Stuff" event flown by the Science Olympiad folks, and is still flown by us now. If you have more specific questions, let me know. Thanks for asking, Bob Stalick.

My P-24 Condor came out fairly heavy at 11.5 grams (without motor), but it still did 2 minutes, 38 seconds on a 36” loop of 0.083” wide Super Sport rubber with 3,000 winds. I had to stiffen the 1/8” by 1/4" (8 pound per cubic foot balsa) motor stick with 0.003” thick carbon tow, which the P-24 rules don’t allow. This reinforced motor stick weighed 2.4 grams. I made another motor stick from 19 pound per cubic foot balsa wood and it weighed 4.4 grams and has equivalent stiffness to the graphite reinforced stick.
Keywords: Intermediate, Indoor, Rubber, P-24
Date: 12.10.2014 20:38
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File size: 593.6 KB
Added by: higgphanx1

Comment:
JAC
Member

Join Date: 12.12.2016
Comments: 1
P-24
Is there anyway I can see pictures of your completed P-24? I'm having trouble understanding the tail plan for the offset and the view A-A, is that for the stability tilt? Thanks!
11.18.2017 09:47 Offline JAC
balsaboy53
Member

Join Date: 11.26.2017
Comments: 1
P-24 tail offset question
I fly with D. Higgins. here is the scoop on view A-A. Let's start with the motor stick..the side view on the plan shows that the motor stick is flat on the top edge, and tapered on the bottom edge, that will produce the view you see in "A-A", the end grain shown at the top of the motor stick is the actual thickness and width of the motor stick at the point of view "A-A". Next is the 1/16 x 1/8 x 3/8 incidence block that the trailing edge spar of the stab rests on (look at side view of motor stick), but the stab is omitted for clarity. The job of the block is to give the stab incidence and to be a mounting platform for the rear of the rudder, to allow the rudder to have enough offset to the left. The odd shape of the drawing that represents the rudder is correct in that the "H" cross piece you see is the lower stick of the plan view of the rudder that is just above the arc of the stab rib, and the two vertical lines are the LE and TE of the rudder. The small drawing of the stab to the left of "View A-A" shows the 1/4" offset of the rudder to the left. Hope this helps.

Neil
04.24.2018 11:22 Offline balsaboy53



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