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Old Oct 20, 2014, 04:42 PM
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Reiher flaps flight test

Today I successfully flight tested 45 degree midwing landing flaps on my Reiher Bomber.

I'm not aware of a more specific Reiher thread so I'll post results and build tips here. That way the next person with a gull wing flap challenge won't have to spend so many hours searching the internet and find so little.

A bomber doesn't have spoilers and I'm used to flaps on my other warbirds and jets. I read even many sailplane purists prefer flaps to spoilers (see internet debate). So for almost 10 years I've had a plane which needs much more approach and runway to land than a normal AMA club. Things were great for a while until our club was kicked out of the full scale airport we shared due to glow engine noise.

I often thought about flaps but was told they would be fatal on a gull wing plane like the Reiher.- at least when in the mid-wing position (as opposed to the inboard dihedral position) A national authority put it in chilling words I'll never forget:

" You will immediately go into a death spiral from which there can be no recovery"
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Old Oct 20, 2014, 04:52 PM
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Gull wing flaps

Gull Wing Planes can't use outboard flaps without "a death spiral from which there can be no recovery" ?

Not true.

Today I experienced steady, stable, controlled descent with increased altitude loss rate--just as you want with flaps or spoilers. My 19 1/2 foot twin engine bomber can now be operated from a normal flying field, greatly increasing its utility and enjoyment.

I think those who have experienced the death spiral may have had no down elevator mixed in with the flaps, resulting in balooning up and tip stalling. I used 6 degrees of automatic down elevator for my low flaps (15degrees) and 8 degrees for my full flaps (45 degrees)
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Old Oct 20, 2014, 05:16 PM
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Let reiher flap mod

The Reiher Bomber is a fantasy scale project. The Germans wanted to reach New York and have at least a shot at making it back to occupied France. German pilots balked at outright suicide missions.Before aerial refueling, this indicated a bomber which could fly a large part of each mission with zero fuel consumption. So they took the most advanced sailplane of the day, blew it up 300% for a crew of 6 and added 2 of the new turboprops. Search the internet and you'll find almost nothing on this , except pictures of Hitler's favorite pilot , Hanna Reitsch, testing Reihers. Why would a rocket pilot waste time on gliders? She wasn't wasting time.

So the Reiher Bomber has exactly the planform of a Reiher sailplane. Flaps should work identically on Reiher sailplanes. Mine is a modification of the LET Reiher. Here's what I did to modify the inboard ailerons into flaps with great sweep, power and rigidity:

1. Re hinged the inboard ailerons at the bottom, and doubled the servo power.
2. Stripped off the cloth covering and replaced it with 1/64 ply--both sides.
3. Broadened the control horn power distribution across multiple ribs using carbon rods and lite ply rib doublers.
4.Closed all gaps--top and bottom --with flex strips used on full scale sailplanes.
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Last edited by softshell29; Oct 20, 2014 at 05:35 PM.
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Old Oct 25, 2014, 12:14 PM
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Gull wing flaps--Reiher Bomber video

These videos demonstrate use of 45 degree flaps for landing and zero flaps for takeoff--all in 8 mph crosswind. You can also see parachute return of the wheels after takeoff.

Despite some similar sounds on takeoff, this Reiher Bomber model has no sound system imitating the Full Scale turbines



Take off (0 min 19 sec)


Landing (0 min 28 sec)
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Last edited by softshell29; Oct 25, 2014 at 12:34 PM.
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Old Apr 09, 2015, 06:18 PM
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More progress....

I made some progress with the parts and got to the painting stage when things slowed down because of the weather. We had a dreary, gray, windy, wet kind of winter not conducive to painting outside. I'm really not complaining because we didn't have to deal with 10' of snow! But Spring is here and all is well. I got the last white color coat done on the fuse today. After it dries I'll put the red band on the fin/rudder. All other parts are painted w/color and clear. I got my decals done by Callie Graphics and she did a great job. The canopy has been covered also. So after the painting it will be a matter of putting it all together and seeing how everything looks,and then some pics and flying!
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Old Apr 10, 2015, 04:27 PM
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Nice work Bill! Would love to see it at the flying field!
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Old Apr 14, 2015, 04:00 AM
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Got some more done. The ailerons are on, servos are in and hooked up along with the spoiler servo. I painted the red band on the fin/rudder. The elevator is hinged to the stab and servo is on. I need to clear coat the fuse and after that hook up the pull-pull for the rudder and get the tow release servo in. Then it time to put it together, get the decals on, balance and fly. Yea! I think I see the light at the end of the tunnel.
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