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Mini Blitz

This month's plan build

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The Wright Stuff17/04/2018 12:52:20
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1143 forum posts
225 photos

Chaps,

A slightly abrupt question if I may, but any comments on how well these things fly? Lots of discussion here about building, but less about flying. As someone who 'doesn't have time to build', I'm tempted to give it a go, but I'm slightly sceptical about my ability to fly it, especially given its small size.

I don't really want to build something that is a one-flight wonder, to live in the corner of the loft thereafter... is this a model you can use as a leave-in-the-car hack, or does the novelty wear off quite quickly?

Cheers,

TWS

RC Plane Flyer17/04/2018 15:03:04
433 forum posts
15 photos

Hello TWS having built a Fizza, Whizza and a Pushy Cat flat wing construction they have to be flown at a reasonable speed all the times. Great to put in back of car has a hack but they are not my first choice model.

Paulo Peres18/04/2018 00:20:39
avatar
81 forum posts
97 photos

Hello TWS,

My model has an engine on the 1200 kV class with a 1300 mAh battery. The first flights were performed with 2/3rds of the recommended throws, no expo and no d/r set.

Take-off can be done at 75% power and hardly any hand thrust. A nightmare: very, very twitchy. Every tiny movement puts the model immediately on a 90º (or more) bank and as it has no functional rudder, starts diving to the ground at an alarming rate. Yet, on the third flight it hit the ground and the engine bulkhead came loose.

The 4th flight last Sat was better: 70% expo (JR radio, hence positive values) and 80% d/r and it was a proper flight. Actually, it flies fine and slow at around 20% power! Nonetheless, doesn't cope well with a little wind. I found myself banking right into wind and it went left as if it were a sail in the sky. Do keep it near you - high contrast colours may not help you out. As soon as it is head-on (or tail going away) in level flight it's just a fine line in the sky. Perception of orientation can easily be lost. A hard landing ensued and the engine bulkhead (electric motors don't have firewalls, do they?) came loose again but it's been repaired by now. Sturdy it is, but don't push your luck. Sorry, no pics of the flights are available.

Hope this is of help. I'll watch this space for your own flight reports smiley

Regards,

Paulo

Brian Dorricott 118/04/2018 09:48:57
50 forum posts
2 photos

As a recent A cert I was a ittle nervous about flying the Mini , the club chairman made it look easy as did our resident wonderkid (15) . So I dialled it down to 50% for me , someone launched it and away it went with me struggling to hang on to it ! I came down a line of trees and tried to turn away but 50% was maybe too much reduction as I just could not turn in time and took a clean 2 inch bite out the leading edge game over . Built a 40% enlarged version with about 120watts per pound and got someone to test it weekend where it flew a lot less manic than standard Blitz , I'll have a go when wind drops a bit but maybe not to much rate reduction this time ! I'll post how it went either way .

Mike Collins18/04/2018 10:30:12
45 forum posts
62 photos

almost completed my build now,

just waiting on magnets for the top hatch

reading this thread it sounds a bit harder to fly than anything else i have so far

last questions i think

i set the 3mm reflex but want to set up dual rates

how many mm travel in each direction should i use for each rate ?

and how much expo for each rate ?

Rene Wallage18/04/2018 14:25:30
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114 forum posts
41 photos
Posted by Paulo Peres on 18/04/2018 00:20:39:

Hello TWS,

My model has an engine on the 1200 kV class with a 1300 mAh battery. The first flights were performed with 2/3rds of the recommended throws, no expo and no d/r set.

Take-off can be done at 75% power and hardly any hand thrust. A nightmare: very, very twitchy. Every tiny movement puts the model immediately on a 90º (or more) bank and as it has no functional rudder, starts diving to the ground at an alarming rate. Yet, on the third flight it hit the ground and the engine bulkhead came loose.

...

Sounds tail heavy?

Paulo Peres18/04/2018 14:41:23
avatar
81 forum posts
97 photos

Rene,

>>> Sounds tail heavy? It may have sounded like that but it's not. CoG was carefully set. However, it hardly has the advised down and sidethrust . It does make a difference with such a small model.

Mike,

As for D/R, I dialled in 80% of travel each way. Expo is 70%. I have more than 3mm throw, though. I think that being conservative on the throttle it's not that bad with the rates/expo I have now. The small size it's worse for my eyes and reflexes! I'll keep on experimenting and give notice.

Paulo

Mike Collins18/04/2018 15:52:52
45 forum posts
62 photos

Thanks Paulo,

do you have 3mm reflex and an additional 3mm for travel totalling around 6mm when full up elevator and that would be neutral position when full down elevator ?

Regards

Mike

Paulo Peres18/04/2018 20:14:46
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81 forum posts
97 photos

Mike,

I just checked and I have 5mm each way from neutral position. Clearly it is too much, even with 80% D/R set. I think I'll cut that to 3mm to see if I can have a more sedate flying experience.

Paulo

Mike Collins18/04/2018 21:44:43
45 forum posts
62 photos

let me know how you get on,

mine is almost finished now so will hope to maiden it in the next few days

did you add any thrust angles to your motor to help ?

Mike Collins20/04/2018 02:23:32
45 forum posts
62 photos

Ok heres the specs and photos

3 cell 1300 Nanotech batteries 108 gram

3 cell 1000 zippy compact batteries 91 gram

AUW 381 gram (inc 1300 battery)

c of g bang on 8.25inch from trailing edge not including the elevons (inc 1300 battery)

Motor

D2826/10
max watts 205
mac current 21A
1400kv
suggested prop 7x4 3s, 9x4.7 2s

Servos
tower Hobby 9gram

ESC
Castle Creations Phoenix 35A

3s Prop Tests
6 x 4 100 watts
6 x 5.5 113 watts
7 x 5 150 watts
7 x 6 220 watts

Think I will try it with the 6 x 5.5 for the maiden then move to the 7 x 5 once i got it set up, what do you think ?

front.jpg

right.jpg

left.jpg

back.jpg

top1.jpg

inside.jpg

bottom.jpg

Paulo Peres20/04/2018 10:21:38
avatar
81 forum posts
97 photos

Nice!

Thx for the tech info. I'll let you know how I get along with changes to my setup. Probably not this weekend, as rain showers are forecast for Portugal.

Regards,

Paulo

The Wright Stuff20/04/2018 13:26:35
avatar
1143 forum posts
225 photos

I love your colour scheme to look at Mike, but I think you might need to add some more contrast between top and bottom. I can see the variation in the pattern, but I fear that won't be visible at a distance...

...just a thought.

Mike Collins20/04/2018 14:13:50
45 forum posts
62 photos

Thanks TWS,

I did think about it after I finished it, I used the left over covering from another previous build.

I will try it as is and will have audible telemetry monitoring the RSSI to help but if its still too hard I will hit the bottom with a nice can of fluorescent plasticote spray paint

Mike Collins20/04/2018 19:52:18
45 forum posts
62 photos

Still learning my Taranis,

But in the Mixer I have managed to set up 3 lots of rates.

for each of left and right Aileron and left and right Elevator I have set a lo mid and hi rate with weights of 30, 40 and 50 respectively.

I then assigned them to switch E lo being back, mid being middle and high being forward.

the mixes then give me

maximums of 60, 80 and 100% rates

I also set 30% expo on the inputs

on the table it appears to work right so lets hope this works in the way my theory says it works

Mike Collins21/04/2018 11:12:23
45 forum posts
62 photos

I added a couple of roundels to the bottom that may help visibility

roundels.jpg

Mike Collins21/04/2018 16:31:06
45 forum posts
62 photos

Ok I got to maiden it,

first try with 6 x 5.5 prop, 75% throttle wasnt enough and it nosed in, no damage except broken prop.

second try a 7 x 4 black prop not apc not sure what it is tbh, pulled it around nicely, them added roundels made it easy to see which way it was going

after 3 or 4 circuits the motor cut,, but i still had elevon control, it nosed in again but not hard so again no damage. I thought the battery must of died quicker than expected at first so put a fresh battery on and still no throttle, I think my esc is bad as it has a flashing red light and no output power so will order a new esc and try again.

during the circuits the 60 % rates was not enough and I did end up on 100% rates mainly for elevation i could stay with 80% rates for aileron control so will now seperate the rates onto seperate switches.

now placing an order for an esc and a couple more batteries

Dave Reap21/04/2018 18:00:57
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9 forum posts
11 photos

Here is an all foam Blitz version..with a KFm2 wing that flies lovely

https://www.rcgroups.com/forums/showthread.php?3067578-Mini-Blitz-speed-delta

Ive drawn up two versions, one is close to the original at 20" span and one is at 22" with a single fin and rudder..

The 22" version is the one I built, as I prefer to have a working rudder.. 

Some changes were made for ease of construction. the Fuzz is a simple box that is fitted/glued on top of the wing. The motor is a quad 2205-2280 with a 6x3 or 6x4 prop.. fitted to a nylon tube mounting.. 

On a 3s 450 half power is enough for a rapid flight

???? how do you post pictures here????

 

Edited By Dave Reap on 21/04/2018 18:12:48

Edited By Dave Reap on 21/04/2018 18:14:05

Edited By Dave Reap on 21/04/2018 18:18:28

Mike Collins22/04/2018 00:50:24
45 forum posts
62 photos

create an album, upload the pictures to the albumthen use the camera icon above your reply to attach them to your post.

thats how i do it anyway

Dave Reap22/04/2018 07:53:09
avatar
9 forum posts
11 photos

thanks for that info... here are the drawings and a pic of the modified 22"

here is a link to a video.. https://youtu.be/ZjAVhflP_NQ

Note the top deck front plate and side walls are extended forward slightly to better cover the motor

 

 

bottom view show laminating film.jpg

 

Edited By Dave Reap on 22/04/2018 07:55:58

Edited By Dave Reap on 22/04/2018 07:58:51

Edited By Dave Reap on 22/04/2018 08:05:11

Edited By Dave Reap on 22/04/2018 08:17:16

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