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RE: SR-71 prop jet project - 9/7/2007 4:23 AM   
combatpigg



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Status: offline 		WOW! DON'T STOP! KEEP GOING! TAKE TOMMOROW OFF AND FINISH IT! I'M GOING TO GET ON A PRAYER RUG AND BOW TO THIS PLANE 5 TIMES A DAY!


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RE: SR-71 prop jet project - 9/7/2007 5:19 AM   
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RE: SR-71 prop jet project - 9/7/2007 5:40 PM   
funkworks



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Status: offline 		Thanks guys!

I got a little slowed down for a bit because I ran out of flat black monokote. I finally got some more and will be back at it tonight. The top will take about 95% of my covering time since there are so many curves...The nacelles are the hardest, but the bottom is totally flat. I plan on using a large white stripe or cross on the underside to help with orientation. I hope to get most of the top done this weekend.

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RE: SR-71 prop jet project - 9/7/2007 8:01 PM   
Lomcevak Duck



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Status: offline 		So the whole thing is a true flat bottom airfoil? I could see from construction pics that the tips are flat plate, but I didn't know you had left off details on the under side of the fuse and chines. I'm interested to see how that behaves at high speed and at high AOA.

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RE: SR-71 prop jet project - 9/7/2007 8:33 PM   
funkworks



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Status: offline 		the whole thing is built on top of 1/4'' balsa. In the front section the bottom was shaped a little like a very shallow "V". This shape got blended where it meets the delta where the underside is beveled back about an inch. In some of the earlier pics you can notice the thick balsa along the edge of the chine and leading edge. In the more recent pics you will notice the edge is more defined. I did it this way to keep this model simple and quicker to build. Ive got about one degree of downthrust and the engine are pointing inwards about one degree too.

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RE: SR-71 prop jet project - 9/11/2007 8:17 PM   
funkworks



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Status: offline 		Got alot done last night. Trying to finish the covering before our club meeting on thursday night. Overall, Im happy with the model. Ive got most of the top covered now except the forward area ahead of the delta. Covering the delta and nacelles was a pain to put it mildly... Im not a big fan of Monokote right now. I had some flat black left over from another project so I used it up before buying more. I got some more and the color of the new one is differnent. They are both monokote flat black but the new one almost looks like a dark charcoal grey. Its really noticable where the two colors meet. Im not about to recover the other sections either. I think Im going to hit the older Monokote with some steel wool to maybe knock off some of the blackness... I'll post some more pictures soon..

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RE: SR-71 prop jet project - 9/12/2007 12:07 AM   
ArmedZagi



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Status: offline 		Thats my luck with white.... It never fails that half the batch will be slightly off.

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RE: SR-71 prop jet project - 9/12/2007 12:21 AM   
vicman



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Status: offline 		I got the same type deal with some neon green Ucote. My plane changed into two diffrent colors after a few hours in the sun at the field.
At 200mph who cares right?


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RE: SR-71 prop jet project - 9/12/2007 6:39 AM   
Robert Strouse


 

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Status: offline 		Hey FW,

This is really cool. Having spent a several years keeping the real deal in the air its refreshing to see someone model it. Anyway, looks awesome.

BTW: The real one balances out at station line 615 which is just forward of the front main trunion bearing (just before takeoff fuel is transferred aft to ensure this aft C.G). It gets real light on the nose gear for a big honkin' chunk-o-titanium.

I'd really like to see some video -- awesome.

Robert

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RE: SR-71 prop jet project - 9/12/2007 5:42 PM   
funkworks



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Status: offline 		Thank you for your service Robert!

Thanks for the tip. The planform on mine is highly modified from the original. I've added more wingarea and reduced the rear sweep of the delta and tried to hide it the best I could. The leading edge of the outter panel is not in line with the main delta but actually a little forward to add wingarea. The nacelle between the panels breaks up the line well and gives the illusion of a delta wing. Ive got the CG figured to be about where the engine cylinder heads are on the model. The internal structure lead me to place the main gear more aft than I would have liked.

My uncle was an instructor out at Beale several years ago. I got a chance to see one takeoff. I'll never forget it. That thing took off like a mad cat!

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RE: SR-71 prop jet project - 9/13/2007 12:04 AM   
Robert Strouse


 

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Status: offline 		I figured you did that for prop clearance. When was your uncle out at Beale? I spent some time there myself between 83-89 with a few jaunts here and there as well.

Anyway there was a bunch in my area that was trying to kit this thing in the mid-80s for DF. As I remember their success was pretty limited because the aircraft had troubles rotating on takeoff. This thing flies like a surfboard and its angle of attack is about 7.5 degrees nose up in normal flight. There is a distinctive incidence change in the outboard wings that helps this dramatically. Actually its a droop on the leading edge that runs almost to the hinge line of the outboard elevon. I have included a 3-view from one of the blackbird pubs. Its really hard to see if you are looking at photos since it blends into the wing.

I hope this helps!

Robert

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< Message edited by Robert Strouse -- 9/13/2007 12:08 AM >

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RE: SR-71 prop jet project - 9/13/2007 12:31 AM   
funkworks



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Status: offline 		Robert...You might have been there while he was there. He was Lt. Col. H. Rodriguez. I think I visited him with my parents back in the summer of '89. He gave my dad and I a tour and let us play with the simulator.

I did add some droop to the outboard leading edge. I did it to help delay any tip stalls. The larger version Im planning has a more pronounced droop. It was harder to replicate on the smaller version while keeping the structure simple. This little one is just a test rig. Im guessing the model needs to build up a good amount of speed in order to rotate properly so I made sure plenty of power and plenty of paved runway.

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RE: SR-71 prop jet project - 9/13/2007 10:24 PM   
funkworks



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Status: offline 		...more pics

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RE: SR-71 prop jet project - 9/14/2007 12:13 AM   
Mike Connor



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Status: offline 		I must say you do good work, and it is a delta too. Very nice. I agree with combatpigg that the nose looks really long from a front view.

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RE: SR-71 prop jet project - 9/14/2007 1:07 AM   
combatpigg



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Status: offline 		Mike, I'll take your word for it......I can't look at the photos any more because I'm not worthy. All this bowing is getting to my back, too. I'm really tempted [about 2 planes from now] to try to build one of these with a pair of .061 Cyclons. I just don't think I'll have the cajunas to be half as faithfull to scale as FW has been.


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RE: SR-71 prop jet project - 9/14/2007 1:12 AM   
ChuckL


 

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Status: offline 		Words cant do it justice that is just too cool hope all goes well on the maiden.

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RE: SR-71 prop jet project - 9/14/2007 5:13 PM   
funkworks



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Status: offline 		thanks guys...

CP or anyone else are welcome to a set of drawings if they like. Ive decided to redo the drawings to take advantage of the fixed landing gear. I figure I can lose at least a quarter to half a pound on the overall weight of the model. The model is way overbuilt. Im going to lighten it up and then clean up the drawings... CP go ahead and listen to those voices in your head and start looking for a good pair of favorite engines .

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RE: SR-71 prop jet project - 9/14/2007 6:23 PM   
vicman



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Status: offline 		With the T-6 racing series coming to an end I have two TT .25s that are calling out.

I am very interested in how the maiden goes.


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RE: SR-71 prop jet project - 9/14/2007 6:59 PM   
Lomcevak Duck



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Status: offline 		Nice job FW. I have a terrible feeling I may be stocking up on balsa real soon if your flight reports are good.

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RE: SR-71 prop jet project - 9/14/2007 7:03 PM   
Lomcevak Duck



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Status: offline 		Also would love to see a bit on your radio installation. Have you mixed all four control surfaces as elevons, or inner/outer split for elevator/aileron?

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RE: SR-71 prop jet project - 9/14/2007 7:41 PM   
funkworks



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Status: offline 		LDuck... right now I have the inner and outter surfaces tied to one servo using a split control rod. Basically..Ive got a elevon and trottle servo in each nacelle and then a rudder/nose gear servo in the forward fuse. Im using mini servos for the throttles. Right now I have the inner and outter surfaces throws matching... Later, I might move the control horn down on the outer surface so I get more throw on the inner surface...Im using elevon mixing on my radio and Im adding about 80% expo for the first flight. I havent decided what the throws will be yet...I'll post some pics of the internals later for ya...

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RE: SR-71 prop jet project - 9/14/2007 8:22 PM   
combatpigg



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Status: offline 		I would have the flaps set on high at 3/16" up & down. Low rate about 1/8" up and down. Then only switch to low when you buddy box it over to the new guy at the club field.


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RE: SR-71 prop jet project - 9/14/2007 8:38 PM   
cncswiss1


 

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Status: offline 		In my experience I would have the "Aileron" component of the elevon throw less than half than the elevator throw...

I have made quite a few long and pointy foamy deltas and they all needed an average (to a bit over average) amount of elevator throw, but if the aileron thro w was set the same they were insanely twitchy in the roll axis, read impossible to keep upright.

most radios allow this to be done..


that is one bad blackbird! very nice.

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RE: SR-71 prop jet project - 9/14/2007 11:04 PM   
funkworks



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Status: offline 		cncswiss1...thats was I was thinking... getting the outter surfaces to travel less...maybe I will go ahead and do that now that I know someone has had some success... I figured that would be the best set up but I really didnt have any experience with deltas...but your idea makes sence....

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RE: SR-71 prop jet project - 9/24/2007 6:48 AM   
cncswiss1


 

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Status: offline 		any flight testing yet?? the silence is killing me

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