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Apr 18, 2018, 03:43 AM
BigTradioman's Avatar
Tulip wood is very stable. I used to have a local joiners shop make custom size front doors for 18 century cottages from Tulip Wood. Itís a smooth finish as well.
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Apr 23, 2018, 04:21 AM
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,...
Last edited by johnny k; Apr 28, 2018 at 01:08 PM.
Apr 23, 2018, 04:37 PM
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....
Last edited by johnny k; Apr 28, 2018 at 01:08 PM.
Apr 24, 2018, 07:11 AM
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blades


Hi

The wood has arrived will be making the blades in the next couple of weeks. Also the standard size servos looked a little lost so I am replacing them with some quarter scale sized servos which are twice the physical size than the standard ones. Hopefully the metal gears will be somewhat meatier than the smaller ones. They will need to be as the weight and size of the blades would kill normal servos.

John
Last edited by johnny k; Apr 24, 2018 at 07:17 AM.
Apr 24, 2018, 02:38 PM
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Last edited by johnny k; Apr 28, 2018 at 01:09 PM.
Apr 28, 2018, 01:05 PM
BigTradioman's Avatar

Another DAG But This Is A DAG 120


So latest bulletin. After installing the new large servos and linkages it has been decided that the mast is just too heavy at 5.5 lbs. So a redesign and rebuild is underway to try and bring the overall weight down.
Last edited by BigTradioman; May 01, 2018 at 01:31 PM.
May 05, 2018, 02:42 AM
BigTradioman's Avatar
Rebuilt mast saved about 1lb.
May 23, 2018, 12:42 AM
AND FOR MY NEXT TRICK....!
jodini's Avatar
Now this is worth watching!
May 23, 2018, 04:09 AM
BigTradioman's Avatar
So the latest news from the JK man cave...........we machined up 3 blades from solid Tulip Wood with the same thickness and profile as my DAG and a little under 5 foot length. The plan was to include a groove towards the leading edge to give correct cg by inserting piano wire. However with balancing and covering the 3 blades weigh in at a whopping 4 lbs. now thatís a bit scary when you think of the inertia and stored energy in those blades at flying RPM. JK is now considering building a second set using the traditional method but with a lite ply bottom skin to edge strength. Next move is to get the motor running and do some taxi trials without the blades, then with the blades to test spin up.
What could possibly go wrong.
The Best of Kenny Everett Reg Prescott Diy (3 min 52 sec)
May 23, 2018, 06:01 AM
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Ricardo1500's Avatar
Tim
I used thin. Birch ply under my big blades and also glasses them in light weight cloth and Easicote...... strong light and stiff
May 23, 2018, 02:41 PM
BigTradioman's Avatar
Thatís probably the direction he will go in Rich. I think we are going to find the Tulip wood blades too heavy. Too much inertia to spin up without a howling gale or a very long runway.
May 25, 2018, 07:11 AM
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Ricardo1500's Avatar
I also used full length of spring steel wire in the le to get the c of g right
May 26, 2018, 03:58 AM
BigTradioman's Avatar
Yes I can see how that would be needed. Any idea how much each blade weighed?
May 29, 2018, 08:05 AM
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Ricardo1500's Avatar
Tim
A 1420mm blade is about 450 grams, that’s glassed, painted and with root reinforcement, ie ready to fly ( or crash!)
May 30, 2018, 02:33 AM
BigTradioman's Avatar
So near enough a 1 lb.


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