I made following modifications

wing span increased to 74 in

root cord 12inch

Tip cord 9inch

Tested with 2x8000mah Tenergy pack

got 1hr endurance

Di-hedral 4inch from wing tip 

IT is very hard to turn from aileron will reduce the di-hedral to 2inch

Prop apc 1407E will test 1412E

Takeoff weight was 4000grams

 

 

Views: 2446

Comment by madhuran wilson on October 1, 2011 at 5:14pm

do you handlauch this? or bungee?

Comment by bmarshall5253 on October 1, 2011 at 7:53pm

 I like how you extended the motor mount for a bigger prop, have you got a close up picture that shows more detail of that motor mount? Which HK model did you start with?

 

Comment by d-creator on October 1, 2011 at 9:56pm

Moderator
Comment by Jost Laznik on October 1, 2011 at 11:34pm

2x8000mAh = 1h endurance?   Correct me if i am wrong. I use 1x 6000mAh, the same airplane, same weight and 45 min of endurance..

 

Comment by Rigel on October 2, 2011 at 12:12am

Also a little perplexed at the low endurance with that much battery capacity.  I've got a Skywalker weighing in at 2.3Kg with a 6000MAh 3s and I usually land it after 45 mins with a good 30% reserve on the battery. 


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Comment by Michael Pursifull on October 2, 2011 at 12:16am

I haven't done the math, but this sort of battery multiplying often results in similar seemingly paradoxical minor gains on the quads... I suspect the "same weight" is for the aircraft w/o battery weight. The additional weight of the 10Ah extra in battery comes with a sustained weight throughout the flight, so while it might be 260% electrical capacity, it comes at a substantial weight penalty, so it does not yield 260% flight time increase. A 30% flight time increase might not be unreasonable. But I haven't done the math here, even though it is similar to other calculations I've make for a quad.


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Comment by Michael Pursifull on October 2, 2011 at 12:21am

But surely 2.3Kg and 4Kg AUW is a big part of the difference... that is almost double the weight, and the wing area is between yours and his is not that much, I think? But I am really trying to hook someone into doing some calculations here so that I can learn from them ;)

Comment by Rigel on October 2, 2011 at 1:03am

Oops...didn't see the all up weight...that would explain it to some degree.

Comment by Ahmed Rehan on October 2, 2011 at 11:15am

1. madhuran wilson :Hand launched pretty easily enough power 

2. bmarshall5253 : Used HK FPV-168 , will post close up picture of mount but it is a simple extension with aluminium plates.

3. Joscht Laznyk : you mean with 4kg of weight you are achieving 45min with 6000mah can you share  your setup motor/ prop/ battery make type how did u mange to balance the aircraft with 6000mah pack as nose need much more weight to balance.

 

The new wing is fiberglass over foam core not built up in balsa.

Comment by nubli hashim on October 2, 2011 at 2:09pm

Rehan, nice one you have. may I know the motor KV and make.. I like to modifiy mine from front motor to middle motor like yours..thanks

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