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Old Jan 25, 2015, 12:35 AM
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Eric Henderson's Avatar
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Originally Posted by Griphin View Post
Cool mod. Do you know how much she weights sans battery? Best thing I found with this model was the light weight to large wings. When I through a prop blade gliding down was not only easy it was a joy.

Not near my shop for a fewdays. Will weigh real soon - E
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Old Jan 25, 2015, 07:22 AM
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No drama just curiously. Drag and stuff will be different too
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Old Jan 25, 2015, 12:37 PM
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No drama just curiously. Drag and stuff will be different too

My expereience with EDF twins vs. prop singles and twins, is that the EDF when off has a lot less drag than the prop. I flew the water bomber at low throttle and no throttle and she did very well. The stall point changed quite a bit when I fitted two 3S 5000mAh packs. Had to keep up the airspeed quite a bit for landing. With two 2800's I could "float" her in. The landing gear handled the weight well and did not side tip as I had feared.


I need to redesign the wing struts. The plastic clevises pop off all of the time. The wings were fitted with CF spars which made them very stiff and I may dispense with the struts - may not! Decisions, decisions.....


E.
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Old Jan 25, 2015, 03:51 PM
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I need to redesign the wing struts. The plastic clevises pop off all of the time. The wings were fitted with CF spars which made them very stiff and I may dispense with the struts - may not! Decisions, decisions.....
.
In mine i installed a CF spar (not very big .. a flat 5mm X 1) from one nacelle to the other... glued both wings with slow epoxy and also afterwards glued a 3mm plywood seat to avoid chaffing the rear screw supoorts (wich get crushed over time) .. and went away with the struts..

Never had any even minimal wing flexing.. not even in the air..

Granted i dont fly aerobatics with this (a roll and a loop from time to time but mostly scale flying) but wings seem quite solid..
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Old Jan 25, 2015, 05:52 PM
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Eric..If you really want to keep the struts you may want to check out the Dynam Catalina or the Flyzone beaver https://www.google.com.au/search?q=f...Y2GQqvcjuLk%3D

https://www.google.com.au/search?q=D...Jt8HgFT86Zk%3D
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Old Feb 01, 2015, 01:33 PM
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Ok
Thought I would share this on here..

The red/white Scooper is what is left of the standard kit scooper after a terminal engine failure and flick spin to self destruction!
We have the wing and tail of the kit with a "home made" depron replacement fuselage.. However Phil liked the idea of flaps so just hacked a couple of simple flaps out of the surviving wing.. And buried a couple of cheap servos in the wing and "transformed" the model.. He can slow it way down compared to standard

Phil's Scooper before its maiden flight self-destruct


And honestly.... This was the maiden flight of the rebuilt kit Scooper... Well done Phil..



The orange/white Scooper is my well worn scratch built depron model built to the Mike Roach (Sopwith Mike) magazine plan of similar proportions..

And
We had a Dynam Catalina trying to join in the fun flown by Paul

The result?

Speaks for itself!
A great video by Christine on the IPhone!

Fun with 3 twins at Carr Mill (2 min 50 sec)


And another of just my scratch built playing with "reflections" in the lake

Scratch built depron Canadair, wet wings mfc (4 min 19 sec)


Enjoy
David
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Old Feb 01, 2015, 02:09 PM
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Brilliant..

I have pending re-cutting the front wood tray to coat the interior front with diluted epoxy and make the quill water tight (it leaks since i rebuilt the front after a crash)
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Old Feb 02, 2015, 11:31 PM
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Originally Posted by Griphin
Cool mod. Do you know how much she weights sans battery?


Best thing I found with this model was the light weight to large wings. When I through a prop blade gliding down was not only easy it was a joy.Not near my shop for a fewdays. Will weigh real soon - E



Dry - no batteries 3lb 5.4oz (1.514kg)

Eric.
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Old Feb 06, 2015, 12:14 AM
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A very nice conversion there, you'll need to post video so we can see how she sounds and flys!

Here is half or your wish.


My Movie 2 (4 min 20 sec)



Waiting for a friend with a boat for next outing which will be on water :-)


Eric.
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Old Feb 06, 2015, 07:58 AM
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Amazing.... seems perfectly adapted ... and also the motors up there seem unlikeky to scoop any water... seems like a win win..

only down might be ducted fans have less "bite" to acelerate out of the water but that should only mean needeing longer take off run..
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Old Feb 06, 2015, 01:00 PM
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Amazing.... seems perfectly adapted ... and also the motors up there seem unlikeky to scoop any water... seems like a win win..

only down might be ducted fans have less "bite" to acelerate out of the water but that should only mean needeing longer take off run..

The fan units are "wicked" 70-mm units from other proiects that I upgraded to Dr Mad 10 bladed uniits - mainly for the "whoosh!"


In the water bomber they are being run on 3S LIPO packs, but were run using 4S pack in previous lifetimes. I have a similar set of EDFs on 4S in my Twinstar EDF which really moves out when you punch it.


Based on the above, I plan to try water take-offs with 3S packs first. I flew off land with a 5000mAh single pack and then with a pair of 2800's and then 2400's. The coolest battery and more nimble flights were with the lighter pairs of 2400 mAh BOLT packs. (I had to set ESC's to hard-read 3S BTW - auto detect would not work with the 4.35V per cell Bolts). The good news is that LVC was normal with these packs.


The airplane will loop on 3S but has mediocre vertical as you woud expect.(not required either).


Here is a picture of the camera mod that I made so that the JVC screen can be ignored in sunlight. Seems to work for young and old eyes :-)


Eric.
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Old Feb 16, 2015, 12:43 PM
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@AndyDodson - Oh NO! Don't use lacquer thinner on EPP or EPS foam. Use alcohol on those. Lacquer thinner for EPO foam ONLY and always test on a hidden area first!
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