Giant rubber powered airplane wins national championship!

hi there i'm joshua finn from j h aerospace and this is the dawn patrol this is the largest outdoor model i have built that's rubber powered um it's slightly smaller by wing area than my largest indoor model but by span and length it is the largest thing yeah uh 26 inch propeller check out that monster and the airframe weighs less than 100 grams without the rubber motor on board in fact the rubber motor weighs slightly more than the airplane so this is a design by bud romack who is i believe 94 years old or coming up on his 94th birthday somewhere in that range and he has been flying dawn patrols of various versions for i guess the past 15 years they are designed for the ama dawn unlimited class which is quite simply a competition class for rubber powered models with no rules other than heavier than air free flight rubber powered has to be cantilevered no wire bracing and the rubber motor has to be inside the airplane other than that wide open so you end up with beasts like this and believe it or not this isn't the largest by any means but what you're going to see now is us doing some flying with it a little bit of basic trimming so uh there's not going to be much commentary on that but what i can tell you is the adjustments that we made after we got the glide going is that i added some down thrust to get rid of the stall under power i added some right thrust to get the pattern to tighten up that wasn't to deal with with the uh control of the flight it was purely to tighten up the turn because the airplane was turning so wide and then i added a little bit of right rudder just to tighten up the glide because it was taking a literally about a mile turning radius until we um added some right rudder so there's a short kit and plans that are for sale on our website uh the front end assembly is not included for anybody that's asking front end assemblies are not part of short kits you can get a suitable front end assembly through valereproducts.com i'll include a link in the description below and it will not be as light as this one but it'll be light enough for most of you because most of you are not going to want a super super light one like this this is borderline ridiculous apologies for the uh birds anyway uh the short kit includes all your cross pieces ribs shear webs all the sheet balsa parts like the pylon and whatnot and you supply longerons spars stab spars etc and covering hardware and so on so it makes it a lot easier to get the airplane built also in that because of the nature of that i basically supply all of the super light contest grade wood and everything that you supply is actually heavier grade balsa so your trailing edges you want to be fairly light so you'll have to search those out but everything else can be fairly heavy wood to make the airplane more durable and makes it uh very simple we've we've done the hard part for you so anyway enjoy some flight footage of the monstrosity that this is and uh i think y'all will like this one all right first test ride ever she knows what it's gonna do all right that's pretty awesome oh wow nice first test glide ever [Music] all right dawn patrol 2 first ever powered flight make sure the timer's going yes it is nice i am ready when you are josh this is going to be fun it's not gonna be super loud it's gonna be even shorter yep this is my tail now was that timer running all the time that this thing was flying so you saw a belly flop at the end yeah that was that going off yeah what happens is almost there and yeah i think you've got a video of this don't you yes yeah i think so if you set up a trigger so that this is locked by your launch rod you use it on a boost glider and okay wow thank goodness the thermalizer went with all that nonsense long enough that we'll get to see a brief glide it sure did getting to fold anytime now and there it goes oh yeah still going still going down love how low the rpms are this is where we start worrying you minute and a half what are you up to about a minute right now yeah right out a minute right now and there we go nice nicely on time not without big of a tail stays nose high all the way down he's not 100 yep he's gonna get daddy's airplane [Music] [Music] so the blades all right go baby looks good josh here we go girl oh it's gonna go so how many oh look at that view that shirt i'd get a picture but i can't i'm afraid to switch off i wouldn't take your eyes off no no somebody could email you that that looks pretty darn good put a dc on it josh you're counting rpms you're ready to take a ride all right let's go good luck guys hmm oh foreign hi i'm josh finn this is hope we are j h aerospace if you like this video hit the like button also how about subscribe to our channel and check out jh aerospace.com for new free flight products and all of the tooling that you'll need to build them thanks for watching

Channel: joshuawfinn

Views: 145,640

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Id: dWZeb233fw4

Length: 14min 0sec (840 seconds)

Published: Mon Aug 02 2021