Go Back  RCU Forums > Electric Aircraft Universe > Electric RC Jets
Reload this Page >

Micro Alfa Jet conversion to RC.

Notices
Electric RC Jets Discuss rc electric ducted fan or radio control prop jets here.

Micro Alfa Jet conversion to RC.

Old 08-22-2021, 02:39 AM
  #1  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default Micro Alfa Jet conversion to RC.

Latest addition yo my Alfa EDF fleet will be this micro version kids toy chukker, I have decided to convert to RC. Lot more work than anticipated, but coming along. Every pic tel










ls the story.
Old 08-24-2021, 12:43 AM
  #2  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Smile


First touch of livery.
It starting to shine after bit of lift.
Old 08-27-2021, 05:49 PM
  #3  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default

The smaller the more fiddly, especially made up from this horrible EPO bubbly foam, bit of the nightmare for fine crafting, taking lot more time than expected. The main wing is now in place with some detailing on the way.

Preps for Ail. 4.5g servos.

Further foam carving to accommodate all the electronics and the flight battery.

Micro soldering to minimize the power lead length.

Small flaps added.

Great news, lighter than expected at this stage.
Old 08-30-2021, 03:39 PM
  #4  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default

Further progress along the way with couple of 'spanners thrown into the works'! As one of the micro receiver's antenna falling off and fully fitted Ail. servos, faulty! Just a part of the hobby! LOL.

Broken off micro receiver's antennas replacement.

4.5 g servos not up to the job.
Old 09-01-2021, 06:27 PM
  #5  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default

After Ail. servo upgrade, all is fine, minor mods to secure the battery and canopy so it won't fly off. While still waiting for the mini bungee cord I have taken it out with a helper to give it couple of hand launches with the lightest 3S/500/75C battery to give me an idea about the CG balance and the thrust. Extremely Ail. responsive so had to do a dramatic travel reduction, seem to move lot nicer than expected after just a short strait level flights into the soft high grass growth.

Bit of the nuisance but had to be done.

Ready for a flight trials.

Airborne!
Old 09-06-2021, 12:54 AM
  #6  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default

After a great success with the #One, I have started on the 2nd. one with further improvements after the experience.

The messy job to start with.

Major improvements in internal ducting.
Old 09-07-2021, 02:32 AM
  #7  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default

Further progress on the way.



Old 09-08-2021, 01:37 AM
  #8  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default

Sealed off and bench tested with the dramatic thrust improvement after new duct design mods.

Old 09-13-2021, 01:48 AM
  #9  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default

Coming along nicely, huge power improvement after redesigning the duct.




Old 09-16-2021, 12:42 AM
  #10  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default

Just about fully fitted out.

Final clear next, ready for flying action.

Belly up finish.

Same current draw but dramatic thrust improvement #2 model.
Old 10-06-2021, 12:39 AM
  #11  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default

Lot of micro flying activity last week, bit of the handful on windy days but delight in calm.

Ideal transport for mini jets.

Busy in the sandy pit.

Easy take off.

Into the circuit.


Old 06-27-2022, 01:24 AM
  #12  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default

Still having lot of fun including some dramas with these converted micro jets, rather unpredictable models, one day flies perfect, next one like a dog, must be the weather! LOL.
(Micro Alfa#1 test run on 3S/.65)




Old 06-30-2022, 12:59 AM
  #13  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default

Another day out with the micro jet, to check my replaced winglets, upgraded from 3mm to 6mm Depron. Definitelly much better, the 3mm ones were too flexy, creating all sorts of problems under the load of highter speed.
Model is extremely responsive even with miniscule TAs on Ail. controls and can get out of hand in a split second! It is very nose heavy at slow speed, with Elevator totally inaffective even with max. travel while while flare-landing.
Totally opposite on power over 75%, when it wants to climb, due to the exhaust outlets slightly bellow the centre line, creating pendular balloning effect. The next one I'll convert I will add slightly more of down Th.
Nevertheless, fun to fly, to keep you alert!.
(Alfa ll test run new wingtips, .65)

Test run on lighter 3S/.65

Extremely CG sensitive, aft balast added with heavier 3S/.85

Close up run.
Old 07-01-2022, 12:12 AM
  #14  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default

Few more runs today on doom&gloom cloudy day, just before the rain. I have to do some geometry Elevator linkage reset to make it more responsive at landing flares, after couple of more bad landings with no Elevator effect whatsoever at finals with reduced or no power glides, even into the light head wind.

Another micro Alfa day.

Few more runs on various lipos.
Old 07-03-2022, 01:04 AM
  #15  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default

Easy launching but the landings are still bit of a challenge, so today I have reset the Elevator travel to absolute maximum by linkage geometry change, it will be interesting next session how affective it becomes. Another short footage, just about tip stall on my first left turn into the circuit shows how quick it can get out of hand, the landing is another story! LOL.
The 3rd.one in the box is still sitting on the bench, waiting for a total write-off one of these, so I can further improve it with all the electronics and power unit, so far no such bad luck but it's probly only a matter of time, LOL.
Just finished today 2nd. part, cont. article to my original build from Sept. '21, for MAS monthly, posted to my Editor to be published late July issue.
(Alfa jet 2 on 3S/.85)

No effect from full Elevator TA.
Old 07-12-2022, 02:28 AM
  #16  
Joseph Frost
Thread Starter
 
Join Date: Nov 2010
Location: Coffs Harbour NSW, AUSTRALIA
Posts: 1,364
Likes: 0
Received 46 Likes on 44 Posts
Default

Another fun with the Alfa jet, slight improvement after geometry travel increase of Elevator tabs during landings.

For a variety.

Great colour scheme in sunshine.


Last edited by Joseph Frost; 07-12-2022 at 02:31 AM.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2022 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.