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Author Topic: Bostonian Bede BD5  (Read 9468 times)
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HGF
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« Reply #125 on: December 14, 2013, 01:44:42 PM »

That is just wonderful. I did build the DeCarlis peanut back when the plan came out, and did find it flew pretty well. I simply made it too heavy. I still have the two piece canopy mold I made for it.
Any chance the plans are available for this delightful Bostonian version yet?

H.G.
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Yak 52
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« Reply #126 on: December 14, 2013, 02:30:32 PM »

Hi, I'm just waiting until I can get some proper flights in but that should be in a few weeks time.

Thanks for the interest,

Jon
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Russ Lister
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« Reply #127 on: December 14, 2013, 02:52:38 PM »

The next Bushfield Jon? Hope to get there again myself, so I hope the weather doesn't turn to proper winter (we've been lucky so far I think)
I've not been able to get to any of the meetings lately ..... was hoping to get there next Friday but I'm double booked with another do  Sad
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Yak 52
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« Reply #128 on: December 14, 2013, 03:32:33 PM »

Hope so Russ, I couldn't get to the last one because I was away for the weekend.
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« Reply #129 on: January 07, 2014, 03:48:35 PM »

Another video from the weekend ... Jon trimming his newly repaired Bede.

http://www.youtube.com/watch?v=oAvJi7P7r_k
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HGF
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« Reply #130 on: November 22, 2018, 07:36:45 PM »

Any further news on your delightful BD-5 Bostonian? I'd love to give one a try!
Henry F.
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Yak 52
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« Reply #131 on: November 23, 2018, 05:08:04 AM »

Hi Henry,

I haven't touched it since the session shown in that clip I'm afraid! It was a bit of a beast to trim with the short tail moment arm. I think I have the plan somewhere though.

Jon
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vtdiy
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« Reply #132 on: December 19, 2018, 09:38:10 PM »

Really Loved this thread and your model Jon! It's beautiful and different.
Watching the video, I couldn't help wondering if a little reflex in the TE could tame it. Don't know of any easy way to do that, so it's Just idle curiosity.
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Yak 52
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« Reply #133 on: December 22, 2018, 08:06:55 AM »

VT - sorry I missed this. Thanks for the kind words.

I think the phugoid problem is a result of poor inertia qualities from the long nose combined with weak dynamic longitudinal stability from the short tail moment. However the static stability is large (tail volume is around 0.8 ) which probably exacerbates the phugoid problem. The strong static stability is good while in trim but once disturbed it tends to fight the weak dynamic damping. It might be better to reduce the tail volume and tail area.

Adding some reflex might reduce the pitching moment a bit and so permit a smaller tail but to be honest the airfoil is pretty low camber already and so I'm not sure it would make much difference.

I haven't really tried to get the best out of the model though so it may well respond if I gave it some time. I still have it - but it's been in a box for about five years!

Thanks for the input,

Jon
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lincoln
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« Reply #134 on: December 22, 2018, 06:11:40 PM »

My guess, from watching the video, is that either it had too much up elevator, or it needed to be trimmed with the c.g. further back. (Obviously you'd need less up elevator then, too.) Moving the c.g. back reduces the static stability without changing the dynamic stability all that much. Shrinking the tail, OTOH, does both.
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Yak 52
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« Reply #135 on: December 22, 2018, 07:09:03 PM »

Thanks Lincoln, yes this is probably the case too Smiley I can't honestly remember what I did now but it did end up with a fair bit of noseweight.
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vtdiy
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« Reply #136 on: December 22, 2018, 10:51:03 PM »

Jon, do you think you might be taking it back out of the box any time soon? Just seems a shame not to get such a nice plane flying the way you want it to.
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FLYACE1946
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« Reply #137 on: March 02, 2019, 06:38:37 PM »

I just located the DeCarlis peanut plan and was wondering if any body knew if it ever had
an article  published on it's construction, maybe Model Builder?

I used to visit the hanger where the dealer sold the full scale Bede's up near Arlington or maybe Grand Prairie, Texas. He had two under construction.
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Indoorflyer
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« Reply #138 on: March 03, 2019, 11:04:53 AM »

Pretty sure it was published in Model Airplane News.  I don't have a digital copy of the article, maybe MAN can help.
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