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#1 |
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Parkesflyer
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36" span Rohr 2-l75 ducted prop plan now with prototype history explained
Not sure if this is an edf or a ducted prop project, but for a while Ive been thinking about this rather radical 1970's design as a foamie. This delta winged, shrouded fan plane was built by Rohr as a direct competitor to Cessna's dominance of the small plane market. Financial troubles eleswhere in Rohr meant that it got cancelled before it went into production.
From the little Ive found though it appeared to fly well, and now Ive scaled up a 3 view for a 36" span depron version. The wing span resulted from scaling the duct for a suitable prop. I considered making it a KF wing, but in the end Ive gone for simple 6mm plate wing to replace the original symetrical one. So far Ive cut out the wing and much of the basic fusalage shape. Im waiting delivery of the UH HXT28-26-CQ 1300Kv Brushless Outrunner that will be fitted with a 7x4 prop inside the duct and hopefully this will arrive this week and then progress can continue Richard Edit after posting this was the piece that got me intersted in this plane as a foamie http://massflow.archivale.com/2_175.htm Last edited by RJPIoW; Jan 21, 2009 at 02:07 AM. |
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#2 |
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Registered User
Join Date: Jan 2005
Location: North Kent, England UK
Posts: 235
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Different and interesting, hope it works out for you.
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#3 |
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The Dude Abides
Join Date: Sep 2005
Location: Brockport
Posts: 309
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This is cool, you gonna draw up some plans?
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#4 |
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An itch?. Scratch build.
Join Date: Mar 2003
Location: South Wales U.K.
Posts: 4,892
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Some more pictures and info - ROHR 2-175
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#5 | |
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Parkesflyer
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Quote:
Richard |
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#6 | |
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Parkesflyer
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Quote:
Richard |
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#7 | |
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The Dude Abides
Join Date: Sep 2005
Location: Brockport
Posts: 309
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Quote:
Sweet! This looks like a neat little plane. With the right motor it could be quite a screamer!! I just added this thread to my subscribe list! |
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#8 | |
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Parkesflyer
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Quote:
The motor Ive chosen from United Hobbies was about the best thrust I could find with a 7" prop Model: HXT28-26-CQ Kv: 1300 Thrust: ~500g ESC Required: 18A Weight: 33g Suggested Prop: 3cell:7x4. Ill fit a lightweight 18A Esc and use a 1000mah 20C LiPo with two 8gm servos on the elevons and a 4.3gm on rudder. Just working out the likely AUW - but I need the motor to build any more - it was shipped a week ago ....... Richard Last edited by RJPIoW; Nov 25, 2008 at 11:12 AM. |
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#9 |
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Parkesflyer
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The motor arrived and Ive fitted it. A few photos attached to show progress so far. Hope to have a reasonable plan ready soon.
Richard |
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#10 |
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Parkesflyer
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More progress - hopefully maiden flight this weekend
Richard |
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#11 |
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The Dude Abides
Join Date: Sep 2005
Location: Brockport
Posts: 309
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I am loving the wheel housings! How are you going to keep the duct from warping during flight? I mean, how will you stiffen the foam ring, or are you going to try it as is first?
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#12 |
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Registered User
Join Date: Aug 2006
Location: ST.LOUIS
Posts: 1,992
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Cool. I asked about this a while back and got "it won't work" from RCG members. I kept at it and found that using an actual fan from a ducted fan or even using 2 props (4blade) made quite a difference in speed. Couldn't find that one prop that would give both speed and thrust. 2 6x3's cut down to 4in spin up nicely and still make a good amount of thrust for low amps.
good luck. BTW mine was a MIG 15 with a big ole tube for a fuse. |
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#13 | |
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Parkesflyer
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Quote:
Plan B was to add 1mm CF spokes just behind the prop. Undercarriage now attached and fuslage sheeting being attached Richard |
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#14 |
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My plans are in my blog
Join Date: May 2006
Location: Kotzebue, Alaska
Posts: 4,462
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Wow. Nice build you got here. Good luck on the maiden flight.
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#15 |
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Will do stuff for EPP
Join Date: Sep 2007
Location: LaSalle, Illinois
Posts: 467
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Richard,
Really interesting plane and a great looking build! Wonder if that big ol' rudder will give you any issues? Also, what are your thoughts on elevons only? Undercarriage looks too nice to land on! Sterling |
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