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Author Topic: Conrad Reely DLG 650  (Read 891 times)
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Andyjbj
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« on: May 15, 2018, 03:29:30 PM »

The Conrad Reely DLG 650 is a 650mm dlg. Anyone have experience with this, or can explain why it flies so poorly compared to the Whipit? Is it just weight, or is it also the design of the wing tips?

I figured that or the rudder, so i changed the rudder as shown and am making a new, high AR wing. Opinions wecomehttps://uploads.tapatalk-cdn.com/20180515/fb79ead1227170cec5682990959c280e.jpghttps://uploads.tapatalk-cdn.com/20180515/1d3bec9507d78d34954894b848df1450.jpg. https://uploads.tapatalk-cdn.com/20180515/52d6500963990f33b1d0e7b2197bea65.jpg


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Conrad Reely DLG 650
Conrad Reely DLG 650
Conrad Reely DLG 650
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Konrad
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« Reply #1 on: May 15, 2018, 09:42:30 PM »

I don't know that the whipit flies very well. But looking at that wing I suspect that with the chord bing so narrow that the Reynolds number are working against any theoretical benefit of a high aspect ratio wing design.

I will say that to get any kind of perfromance from my UMX ASK-21 I have to keep the speed high.
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Cut it twice and it's still too short!
Konrad
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« Reply #2 on: May 16, 2018, 09:31:02 AM »

For the "stock" models I see where the advertised weights are vastly different 43g verses 61g.
I also suspect that the longer fuselage of the Whipit adds stability and control power.
https://www.horizonhobby.com/product/airplanes/ultra-micros/sailplanes/umx-whipit-dlg-bnf-basic-eflu3150
https://www.conrad.com/ce/en/product/1591490/Reely-DLG-650-RC-model-glider-RtF-650-mm

All the best,
Konrad
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Monz
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« Reply #3 on: May 16, 2018, 02:21:34 PM »

I've just been getting into DLG with a second hand, ready to fly, one of these: http://streamf3k.com/products/nxt/

I've not flown any of the lower end models (nor any previous DLG experience in fact) so can't comment on their performance, but I would recommend finding a second hand 1.5m carbon DLG online and flying that. The learning curve is really shallow with one of these high performance gliders as they fly so well.

This NXT is the most fun I've had in a long while!
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SP250
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« Reply #4 on: May 16, 2018, 05:11:57 PM »

Blimey Monz that Stream is not cheap!

I thought the Akcent 2 that I'm assembling now was a touch pricey at nearly £300.

John M
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Andyjbj
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« Reply #5 on: May 17, 2018, 12:51:10 AM »

Yeah the wild high AR wing is my mod. I did notice the weight difference but not the tail length—thanks, good idea.


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« Reply #6 on: May 17, 2018, 11:06:03 AM »

High AR wings without composite structure are a bad idea, especially on a DLG.

Stream NXT is a high end (albeit now somewhat dated) F3K model that is notoriously difficult to fly to its full capabilities. There are a variety of similarly priced models I recommend over it, especially the Flitz, which is much better mannered and launches just as high. The Snipe is also quite good and similarly easy to fly. You can pick up used ones fairly cheaply. I've beaten very experienced fliers who were invested in the NXT while flying 10 year old bagged wing designs. That's a pretty disappointing condition for a model that's proven capable of much higher performance. It's just that hard to fly it efficiently.

If you want an affordable full composite DLG, get the new Epee XT. I've flown several Epees and am extremely impressed with them. Experienced fliers are launching it well over 180' for flight times over 2 minutes. That's pretty spectacular for a model that ships to your door for under $200 (in the US, mildly higher overseas). Bear in mind it's a bind and fly DSMX setup, so you'll have to specifically request a different receiver if you don't fly DSMX.
https://www.rcgroups.com/forums/showthread.php?3069364-Epee-XT

Additional note: I owned a Whipit for a while and crashed it multiple times from the nose slipping off and ejecting the battery (even with the nosecone taped on). I love how they fly, but that's a dealbreaker because the control brick is in the part that breaks off. Finally in frustration I built a smaller balsa model which does not feature the weaknesses of the Whipit. The result was this fun little bird which launches better than the Whipit and has better wind penetration.
https://www.youtube.com/watch?v=Rm7ba2A-0YY
And then I put a rocket pod on it because, well, why not?
https://www.youtube.com/watch?v=SgKCVl0MxQM&t=2s

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Andyjbj
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« Reply #7 on: May 17, 2018, 02:47:42 PM »

Yeah the high ar wing collapsed with the first few flights today, it would have needed stronger foam and stronger carbon. Do you sell plans or kits for that ‘19 glider? looks great.


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Yak 52
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« Reply #8 on: May 17, 2018, 03:26:14 PM »

19" is huge Josh  Wink Cool

Jon
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Re: Conrad Reely DLG 650
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Konrad
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« Reply #9 on: May 17, 2018, 05:24:45 PM »

If you are looking for a simple inexpensive easy to build DHL that will teach you the basics of low level thermal hunting this might fit your requirements.
http://www.mountainmodels.com/product_info.php?products_id=212

The small micro gliders can work but really are a a disadvantage. This is why they often need to be of exquisite construction and form.

May I ask what you are expecting from these micro gliders?
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Andyjbj
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« Reply #10 on: May 18, 2018, 02:19:17 AM »

yeah, my fields are very very very small. The bug is the biggest/fastest glider i can fly there. I even get the whipit in the trees sometimes.


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« Reply #11 on: May 21, 2018, 01:15:10 PM »

19" is huge Josh  Wink Cool

That's a sweet rig, Jon. How does it fly?

Yeah the high ar wing collapsed with the first few flights today, it would have needed stronger foam and stronger carbon. Do you sell plans or kits for that ‘19 glider? looks great.

Yup, we have a kit for it: http://jhaerospace.com/product/carbonette-19-micro-r-c-dlg-glider-only/
If you can source B-C impulse rocket motors and wish to fly it to the edge of visibility, you can get it with a boost pod:
http://jhaerospace.com/product/carbonette-19-micro-r-c-dlg-boost-glider/

Here's a build review from James Duffy, one of the best rocket glider guys in the US: http://www.rocketryforum.com/showthread.php?144457-Carbonette-19-R-C-BG-DLG
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Yak 52
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« Reply #12 on: May 26, 2018, 04:27:57 AM »

That's a sweet rig, Jon. How does it fly?

Not too badly considering! I was just messing about to see how small you could go.

Konrad asks a valid question about what is reasonable to expect from these small DLG's - they are a lot of fun but not serious thermal machines. That said it's quite possible to thermal something like this on the right day. What the small models don't have though is the ability to penetrate sink from one thermal to the next, that is the main advantage of bigger models.

There are three things you need to get right to give a reasonable sink rate (ie hang time) in a small DLG:
1. Low weight
2. Large chord and low aspect ratio

The latter is not always obvious but the optimum aspect ratio for these small models is much lower than you would expect (my tiny one has moderately high aspect but was built for looks!) probably around A=6-7 is about right at 24". Anything with a chord under about 5" has an instant disadvantage from low Reynolds numbers.

3. Good airfoils. For small DLG's you need something similar to free flight CLG/HLG airfoils but without the flat Stanfoil/Egglestone 'vortex nose'. Thin is good but not less than about 5% because you lose the camber for thermalling. It's a trade off between launch height and float.

The Conrad Reely 650 looks a bit heavy to be honest. But a high aspect wing really wouldn't help even if you could make it work structurally.

For serious F3K flying you really can't beat a proper carbon 1.5m model like the NXT (which, although has been marginally superceded recently, spent a few years at the top of the pile with the Flitz and Snipe) The model you know well and fly instinctively is always going to beat a technically 'better' model flown poorly so it's a mistake to get hung up on the numbers and much better to get out and practice to death. This is why I had to get out of F3K - my duff knee just can't handle the hours of launching required to be any good. Fortunately my NXT went to a good home Smiley

However an awful lot of fun can be had with a simple and cheap set up. My 30" Vela design has flown about 90hrs and 3000 launches and cost me about £30 to build including servos battery and rx Smiley

https://static.rcgroups.net/forums/attachments/6/3/7/9/5/2/a9734279-204-a9644100-221-WP_20160331_12_48_25_Pro.jpg

Below is my Frenzy 1m - which had much higher performance but a higher pilot work load

https://static.rcgroups.net/forums/attachments/6/3/7/9/5/2/a9568265-201-WP_20160619_14_18_52_Pro.jpg

This guy is also coming up with some nice ideas based on FF airfoils: https://www.rcgroups.com/forums/showthread.php?2602577-YaShii-700mm-mini-dlg

There is also Frans Bals Mimi design with free plans available.

Ultimately you can have a lot of fun for not much money if you build something.
Conrad Reely DLG 650
Conrad Reely DLG 650
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Konrad
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« Reply #13 on: May 26, 2018, 12:47:48 PM »

Yak,
That is a nice write up.

I’m impressed that there are now R/C gliders that look to be based on the larger catapult glider of my youth, such as the Jetco Thermic “B”. Even back then, I saw a wide variation in glider performance just from a few swipes of the sanding block. Now with those wild looking airfoils I can only guess at how much performance has been extracted from the solid balsa wing gliders.
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Andyjbj
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« Reply #14 on: May 26, 2018, 03:08:10 PM »

great explanation. then i’ll certainly not go for the high ar’s.


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