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Posted by Old_Pilot | Mar 14, 2017 @ 12:52 PM | 1,367 Views
I think I got everything fixed.......yet to maiden.....weather's been crappy
Posted by Old_Pilot | Feb 20, 2017 @ 06:18 AM | 1,249 Views
She died Saturday.....but I learned something about the limits of foam board.....I flew her successfully a few times, but on the last flight, I turned to make a high speed pass over the runway and when I leveled the wings and throttled up, I saw the fin buckle and turn almost sideways......she broke in half when she hit the ground..BUT, I learned that the tall slender (unreinforced) tail fin was just that...too tall and too slender....I've already addressed that problem..the fin failed diagonally from lower back to mid front. I've decreased the slenderness of the fin, and will add stiffeners, probably bamboo, to both the leading and trailing edges for their entire length. Kinda sorta reminded me of what paper does when you blow on it edge on.

Rev 2 this week....
Posted by Old_Pilot | Feb 16, 2017 @ 12:35 PM | 1,380 Views
She's a dream to fly......no bad habits

F4D Skyray (3 min 17 sec)

Posted by Old_Pilot | Feb 15, 2017 @ 05:21 PM | 1,577 Views
Rev 0 (the gray one) was doing pretty well on her maiden until the fan rotor let go and went through the side of the fuselage and part of the wing......had to cut her apart just to get the rotor out...so I built Rev 1...few minor changes......servos are let into the underside of the wing this time..almost 6 inches of battery (CG) adjustment.....three hatches..skids a little farther forward......
Posted by Old_Pilot | Feb 09, 2017 @ 08:18 AM | 1,434 Views
My friend "builderdude" inspired me to attempt this build.....his is balsa, this one is Elmer's board.

36" WS, KFM-2 wing/airfoil, 90mm Freewing fan, 1850 kv motor, 6S battery.....if I can get the shop warm enough, I'll try to get her painted today. Otherwise, I'll just fit the rest of the hardware and start masking....

The drawings and patterns have been revised to as built/as flown.........Continue Reading
Posted by Old_Pilot | Jan 27, 2017 @ 09:01 PM | 1,958 Views
Shortened the nose by an inch and moved the battery back up under the wing...bottom hatch......no ballast required to get to CG......painting her now

Here's the video:
A 7 Rev 1 Maiden (3 min 37 sec)

Posted by Old_Pilot | Jan 15, 2017 @ 08:03 AM | 1,273 Views
Flew her 5 times yesterday morning.....broke a prop and replaced it with one I had in the box.....unfortunately it wasn't balanced. Vibration caused the canopy to rattle off...However, she's a beast.....fast and maneuverable......this variant is nose heavy, even with an extra 6 ounces of lead in her tail. I'm going to build her again with a CF spinner, relocate the battery up under the wing to move the CG even farther back, and put the access hatches on the bottom of the fuse. The full length ailerons worked perfectly....help counteract the torque roll of that big power 15 on the front......It looks like I can cut close to 8 ounces out of this airframe (lead and spinner) which will reduce the AUW to right at 40 ounces.......

A 7 (0 min 43 sec)

Posted by Old_Pilot | Jan 10, 2017 @ 11:32 AM | 2,334 Views
I've been on a "simplify" kick lately...here's the latest......gonna build her this week.....

She's being painted now........Note, the let in work is the most time consuming, but the rest of the airplane went together like a kit

Update: She was underpowered or under propped...turned downwind and her butt fell out of the sky..stalled and went in hard...probably need to cut a foam core wing next time ( S-7036 or a 9% Clark-Y).the KF-2 airfoil didn't provide enough low speed lift...I'll build her again
Posted by Old_Pilot | Dec 16, 2016 @ 08:34 AM | 1,841 Views
She's a cross between my StealthStream, the Concorde, and a Vulcan........Flight Ready......no ballast required to get the CG.....(2) 70mm Freewing 6 bladed fans, Freewing 2836-3300 kV motors, 65 Amp ESC's, 2600 mah 30C 4S batt's, TowerPro MG946R Servos, Lemon 6 channel Featherlite DSMX/DSM2 receiver, McDonald's large coffee cup nacelles.....3.6lbs All up weight...close to 8 lbs of thrust

Results of maiden: Complete failure boys......I got the CG way too far back.......did something wrong in the balance calc's, just not sure what yet.......jumped off the ground like a grasshopper and went straight up....no amount of down helped.......I suspected that the fans were too far back, but forged ahead anyway......back to the drawing board.

Update: FOUND IT !.....when I calculated the CG, I forgot to set the CG at 25% of the mean aerodynamic chord...calculator defaults to 30%......which means the CG is about 2 1/2" too far back.....in the words of Jeff Dunham's Walter...Dumb ass !
Posted by Old_Pilot | Dec 01, 2016 @ 06:13 AM | 2,111 Views
Had to replace a combat wing after a mid air...we hit so hard that my motor was broken...got her back to the bench just in time for her to burst into flames.....so here's the new one

Flight Ready: GForce 3542 1250 kV, Tower Pro MG90S, Lemon 6 channel, 50 AMP ESC, 2600 mah 30C 4S.....gonna test fly her with a 9x4.5.....combat with a 9x6.....

Update: maiden flight...
Delta Combat (2 min 34 sec)

Posted by Old_Pilot | Nov 25, 2016 @ 10:49 AM | 2,012 Views
I found (4) 70mm fans/motors in the bottom drawer...and decided it was time for another twin....this time I buried the fans in the wing plates.....haven't started on her yet, so I haven't found the "uh-oohs"..but I'll build her next...Continue Reading
Posted by Old_Pilot | Nov 21, 2016 @ 07:28 AM | 1,861 Views
L 19 Maiden (5 min 36 sec)

Posted by Old_Pilot | Nov 16, 2016 @ 03:34 PM | 2,516 Views
Just keeping busy.......My first attempt at this little girl was a disaster. It ended up with 6 degrees of "UP" built in to the airframe because I failed to notice the decalage in addition to the incidence of the original FF design......So I found the original full scale drawings of the L-19 and scaled it down to...Continue Reading
Posted by Old_Pilot | Nov 13, 2016 @ 07:40 AM | 1,746 Views
This morning's discovery.......a trimmed McAlister cup is the perfect efflux cone for a 90 mm fan
Posted by Old_Pilot | Nov 10, 2016 @ 05:27 PM | 2,479 Views
just for fun

Delta Combat (2 min 34 sec)

Posted by Old_Pilot | Nov 05, 2016 @ 02:52 PM | 2,420 Views
Gonna take the original 12" WS, rubber powered, free flight Frog Mk-4 Interceptor and turn her into a 60" 5 channel RC.......with one major change....I'm going to build her as a parasol....the shoulder wing version has already been done......

This will serve as the build log for my entry into BBCC 8......based on these drawings.....

I added the history behind the Mk-IV........
Posted by Old_Pilot | Aug 18, 2016 @ 06:22 PM | 2,905 Views
Y'all ain't gonna believe this......go sit down.....
Dassault Systemes' drafting software (Draftsight) has asked me to come to Waltham MA to film the construction of 2 of my flat jets (a 70 and a 90) to be used as a presentation of the capabilities of Draftsight at SolidWorks World conference in L.A. in Feb......I've been beta testing some of their stuff over the last year.....that's another story.....

Anyway, I was sending them the drawings for the StealthStream (with the 3D), and one thing led to another...it's a hoot.......all expenses paid.... I didn't post this anywhere until it was finalized.

Well, it's been finalized ! I'm about as excited as a 5 year old on Christmas morning......

They originally offered to fly my wife and I to L.A. for the SWW conference in Feb. But I countered with an offer to come to Waltham to build and fly the aircraft for their marketing purposes.
And they sent me this today..full 3D solid model of the StealthStream....using SolidWorks.

They went nuts when they saw the last 90mm take to the air.
..and all of this happened because of a couple of pieces of foam board and a fricking coffee cup.........LMAO