RC_Pattern_Flyer

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This is the second prototype of the Harmony bipe designed by renowned designer Mike Harrison. Mike is known for the successful airframes such as the Aries and Symphony.

Mark Hunt from www.insightrc.com and the designer of the Pentathlon and Insight planes drew this plan in cad and has the kits laser cut. Design changes are again being made to ease in the building of the model and aide in saving weight. These kits are currently not available nor is there a timeframe in which they might be.

I am sharing this plane with the community just because its too cool not to.

This is a quick post, I have much work to do but as she sits, covered with gear and mount 5 lbs 2 ounces.

Enjoy!

RC_Pattern_Flyer

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More pics

Ryan Smith

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Is this one yours Chuck?

RC_Pattern_Flyer

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This is my Bipe.. yes... hope to fly it one day

It will have YS 160 power.

Chuck

handglider

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DUDE that is TOO COOL....

thanks for sharing

rcpattern

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Very nice....when are you gonna bring it out so we can play with it!!!!

Arch

TOYMAKER

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I kinda like the markings on it. Reminds my of the spy photos of cars as they are being proto typed.
Git her done!

WG

RC_Pattern_Flyer

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Here is the bipe.. hours from being ready to go. or days as time permits.

All up weight before fuel ready to fly.

9lbs... 12 oz.


Chuck Hochhalter

flyintexan

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Dang...You sure you didn't forget something?....like a motor...a wing......or a brick...?


-mark

MHester

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WHOA....a 9 lb 12 oz bipe.....

Dude you just single handedly obliterated the curve!

I love it

-Mike

rcpattern

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Well, I'm sure Chuck will post when he gets home..but I live closer.

The sub 10 lb bipe flies.  Flew pretty well to on its single short flight.  Tons of power with the YS 1.60DZ.  Mr. Bipe Chip Hyde was here to add input and it looks like it flew well.  Need to change some rates, but all in all a definite success.

Arch

RC_Pattern_Flyer

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Arch... Thanks for the quick post.

So... she flies.  I am very pleased with its maiden... she did not explode!  Furthermore.... before taking off Chip walks up to me.. looks her over and mentions a couple of mixes to add BEFORE the first flight and they were almost dead on.

So... yes it does need mix, it is not the end all plane of all time and I am happy with that.

It has proverse roll in knife edge, very little pitch to the belly if any, wind kinda hid some things... can't be sure.

Needs a little right rudder with idle.

Think I might need a little down elevator with idle as well but not sure... seemed to want to balloon a little on landing and in downlines I think it was pulling to the canopy.  Again, I was so damn happy she hadnt exploded that it could have done anything and I would be smilin!!!


So.. more to come and pictures if I can get them outta the new camera.


Chuck Hochhalter

RC_Pattern_Flyer

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More pics of the Maiden flight....

RC_Pattern_Flyer

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OK...some more....

RC_Pattern_Flyer

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So.. yes.. I am smilin!!!!!

Ok, well, second flight was cut short by funny noise and upon landing the flying wires were really loose and sun falling quickly so taker home in one piece.

So.. onto the contest that weekend and a early saturday morning flight. Well.. THIS time the header came loose and so we landed and decided to go through the plane all over and make sure no issues were found elsewhere. Even in this short flight the new heavy duty nonstretch flying wires .. uh.. stretched.

Througout the day I redid the flying wires again... waited till flying had slowed after the first 4 rounds and off to the flight line. Lots of people watching with curiousity and a few guys brought their scales... after lifting the plane they did not even question the weight.

So... roll out and smooooth lift off. This is where I discovered how to get 30 pattern guys in Unison.. FLUTTER!!!!!. Chop the throttle and slow down... all four ailerons were flapping in unison but easily handled, circle the field and a smooth landing.

So far I have (since I have a pound to give) cut off the aierons, made them bigger and stiffer, cut off the old leading edge and thinned the chord of the tips.

I am adding a 1/4 carbon strip to the new hard balsa leading edge and also added hard balsa aileron hard point. this has strengthened the wing considerably, I will be adding carbon reinforcement and fiberglassing the centersection of the wing I believe.

This is in progress now and hope to have it done in a few weeks.

Chuck Hochhalter

Doug Cronkhite

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Chuck.. get rid of any downthrust, or add a little up thrust if you're at 0 currently. This assumes you have the CG where you want it. Sounds like you're carrying some up elevator trim with the power on, which is then not needed with the power off.

mjfrederick

Sounds like classic tailheavy symptoms to me...

RC_Pattern_Flyer

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Plane drops the nose when the 45 deg upline roll to inverted test is performed.

I think you might be right about the thrustline.... would also clear the pull to the canopy in the downline... cant remember if it did.. but i think so.. hahaha.. too excited.

Chuck

Doug Cronkhite

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Tail heavy? Sounds completely opposite of tailheavy. Also, the behavior is specifically noticed power on to power off. A tailheavy airplane generally requires down elevator trim, something that would not cause the behavior listed.

MOST biplanes I've built have required a small amount of upthrust, from the old .40 sized Baby-Bi (RCM Plan) to my 46% Ultimate Bipe.

RC_Pattern_Flyer

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Just a note as well... I have flown the plane 3 times... and only one of those was a full flight. Second was cut short my motor trouble and the third was at 50 feet after takeoff massive flutter.

So.. honestly... I am not going to change anything on my setup until I can solve the aerodynamic disaster waiting to happen issue which may clear up a bunch of the other stuff.

I will advise all when we are flying again.

Chuck

Jason Arnold

Hi Chuck,

Any further progress on the Harmony biplane issues & trimming?

I see Insight RC now has the Harmony II so one assumes that previous issues identified have been resolved.

Really like the look of this model and with the weight <10 pounds should make a great electric model.

Cheers,
Jason.

jarvis johnson

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Hey Guy's
Since we are talking Bi-Planes, here are a few photos of the "Insomnia" bi-plane, designed and flown by the father and son team of Matt and Jim Kimbro.
Matt recently used the Insomnia at our last contest, in Southern California.

I think that Matt said that he will be using the plane for the F-13 pattern at the Nat's this year. They are still in the trimming stage, but I'm with the help
of Chip, it should be ready to in July.

Rendegade

The symmetry, it fills me!

Jason Arnold

Hopefully it doesn't put you to sleep....

Rendegade

I didn't realise that symmetry was like turkey [&:]