Herb's blog View Details
Posted by Herb | Nov 08, 2018 @ 12:59 PM | 2,158 Views
I got one of these from MRC during the pre-order sale, should be here middle of December

https://www.motionrc.com/products/fr...mm-edf-jet-arf

http://sz-freewing.com/productlist.aspx?t1=2&t2=26

https://www.rc-castle.com/index.php?...DESC&limit=100

The model has a wingspan of 106 cm, while the full scale one has a wingspan of 13.56 m :

https://en.wikipedia.org/wiki/Lockhe...in_F-22_Raptor

so the scale here is 12.79 : 1 or roughly 13-th scale.

I am not sure I need another grey jet, but this one looks good on close inspection - and is my favorite size, 90mm.

I got the arf plus version, so will put in my own JetFan + HET inrunner power system. I never had the JePe one but saw it fly, and it was a great flier.

Nice pictures of the model have been posted here :

https://www.rcgroups.com/forums/thum...one&starter=no

.
Posted by Herb | Nov 06, 2018 @ 03:38 PM | 2,586 Views
I thought I post here the various remarkable improvements that JePe applied to the white foam FlyFly F-22 Raptor kit.

http://www.jepejets.com

The $80 Fly Fly F-22 kit sure is a bargain ... if you can find one. The FW one is almost exactly the same size / wingspan

Interestingly enough the new FW landing gear might also be a good choice for the FlyFly one.

http://www.generalhobby.com/flyfly-r...ion-p-880.html

https://www.aliexpress.com/item/Flyf...960015703.html

https://www.generalhobby.com/twin-70...ion-p-819.html

Several threads have been posted on the FF / JePe F-22 Raptor in various places, here are a few :

http://www.rc-network.de/forum/showt...aubericht-F-22

http://www.rc-network.de/forum/showt...2-Raptor-MK-II

http://www.rc-network.de/forum/showt...xybeschichtung

.
Posted by Herb | Jul 15, 2018 @ 10:53 PM | 4,510 Views
I got this one from a friend that wasn't too eager to build it, at a good price

Some time ago (~ 2 years) it was sold by HobbyKing :

https://hobbyking.com/en_us/harrier-...___store=en_us

https://www.amazon.com/HobbyKing-Har...ct_top?ie=UTF8

Originally their idea was a 4S 70mm edf setup with a 40A esc and a 2200mAh 4S battery ...

It seems the original was made by Guan Li ... https://www.rcgroups.com/forums/show...rrier-70mm-EDF

The model has a wingspan of 780mm whereas the original has a wingspan of ~14.2m

https://en.wikipedia.org/wiki/Harrier_Jump_Jet

which gives it a scale of ~1:18.2 .

....Continue Reading
Posted by Herb | Jun 19, 2018 @ 04:14 PM | 10,222 Views
This thread is about the new Freewing L-39 Aero Albatros.

This thread in German :

https://translate.google.com/transla...100&edit-text=

and Italian :

https://translate.google.com/transla...100&edit-text=

I always liked the L-39, a very nice flier if built light and goes pretty fast with little power.

https://www.motionrc.com/collections...9-albatros-arp

https://www.motionrc.eu/collections/...9-albatros-pnp

http://www.hebu-shop.ch/index.php?ca...EPO-Jet-s.html

https://www.rc-castle.com/index.php?...roduct_id=7875

https://www.rc-castle.com/index.php?...roduct_id=7876

Freewing Model China web site (not the fake freewingmodel one) :

http://sz-freewing.com

http://sz-freewing.com/productlist.aspx?t1=2&t2=25

The wingspan on the original is 9.46m vs 1.053 for the model, and length 12.13m vs 1.351m for the model, that gives a scale on 8.98:1 or very close to 9-th scale,

https://en.wikipedia.org/wiki/Aero_L-39_Albatros

A number of well known model makers (Savex, Schreiner, C&C etc) had/have some beautiful molded edf L-36s, and HTG had a nice one too (from which JePe took over the molds).

Here's again some details on the original(s) :

https://en.wikipedia.org/wiki/Aero_L-39_Albatros

https://en.wikipedia.org/wiki/Aero_L-59_Super_Albatros


Edit : videos added :

.

Herbs Freewing L-39 Albatros maiden flight (2 min 49 sec)


.

L-39 Albatros by Freewing 80mm EDF - 4K (3 min 55 sec)
...Continue Reading
Posted by Herb | Jun 05, 2018 @ 04:57 PM | 5,047 Views
There are frequent heated discussions here on RCG and elsewhere on what the C ratings of LiPo batteries are, how they are obtained and how accurate they might, or might not, be ...

Here is an example of a so-called "LiPo C-Rating Calculator" that surprisingly does not even state what formula it uses to achieve the answer:

http://www.soko-heli-tools.com/en/li...alculator.html

One can even find a $90 device that when plugged into your battery will give you your magic C-Rating:

https://hobbyking.com/en_us/wayne-gi...cell-lipo.html

It looks all like rather mysterious physics until you realize it is all based on 1850's physics (Ohm's law) and middle school arithmetic (see below).

Here is some better discussion that leaves out all the foggy rubbish & nonsense (actually more of a sensible definition of terminology) :

http://web.mit.edu/evt/summary_batte...ifications.pdf


So what is the formula and what exactly does it tell you ??


So take the "calculator" from the first website:

A 5000mAh battery with a cell count of 6 and a cell IR of 2 milliOhm will give a C-rating of 24.5.

A little Mathematica algebra (see pdf below) allows to almost immediately extract the trivial (and ad hoc) formula they are using :

C Rating = 2451 / SquareRoot[ capacity * resistance ]

Nothing else enters the formula (try it out for yourself), all you need is the capacity in mAh printed on the pack (which most can read), and the internal resistance (IR) in milliOhms.

...Continue Reading
Posted by Herb | Feb 09, 2018 @ 09:23 PM | 18,598 Views
I managed to get the ARF-Plus version from Motion RC, just in time before the Friday morning stampede

http://sz-freewing.com/

https://www.motionrc.com/collections...phantom-ii-arf

http://www.rc-castle.com/index.php?r...+PNP&limit=100

http://www.f-hobby.com/rc-edf-jet-90mm-c-45_10

https://www.rcgroups.com/forums/show...Phantom&pp=100

Delivery if all goes well should be mid-April.

The original F-4 D Phantom had a wingspan of 11.71m and an overall length of 17.76m, whereas the model has a ws of 103cm and a length of 155cm, so the overall scale is ~ 11.37 : 1 (based on wingspan) and ~ 11.46 to 1 based on the length.

https://en.wikipedia.org/wiki/McDonn...F-4_Phantom_II

The F-4 D comes with a new 90mm 9-blade plastic / metal fan w. outrunner, in some ways similar to the one in the A-10 (which is 80mm though). It seems like a light setup (but I have no idea how much that fan weighs - edit: 378g).

I will put either a WeMoTec Evo 90mm fan with HET inrunner motor in mine, or the equally acceptable lightweight JetFan 90mm.

Black or Brown, that is the Question


EDIT : Maiden video added March 24



Freewing F-4 Phantom JetFan 90mm maiden flights - combined video (3 min 21 sec)




F-4D Phantom II 90mm EDF by Freewing - Fourth Flight (3 min 8 sec)
...Continue Reading
Posted by Herb | Jan 26, 2018 @ 12:40 PM | 8,532 Views
I just got this new FrSky Q x7 16-channel telemetry & s-bus radio from Amazon (prime) for $105 (vendor: HeliDirect)

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

and occasionally you can get it even for less. There is a (very) slightly new model Q X7S so that explains the price drop.

Mine arrived in two days because of Amazon Prime, if it comes from china it takes a bit longer

I also got a FrSky X8R telemetry & s-bus 16-ch receiver for $34 from Bangood :

https://www.banggood.com/FrSky-X8R-2...r_warehouse=CN

https://www.amazon.com/FrSky-Taranis...HFM/ref=sr_1_8

and a set of Sanyo eneloop 2000mAh batteries from Amazon (I already have the charger):

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

which seem to last forever (many hours) in this radio.

Bangood and many other places carry a full line of FrSky telemetry sensors:

https://www.banggood.com/search/frsky-sensor.html

Aloft Hobbies is another good local source that I used in the past :

https://alofthobbies.com/radio.html

https://www.gearbest.com/multi-rotor...00.html?wid=44

https://www.banggood.com/FrSky-ACCST...l?rmmds=search

.
Posted by Herb | Dec 13, 2017 @ 04:53 PM | 10,519 Views
I got this nice MiG-21 as an "airframe only" kit for $249 from MRC :

http://sz-freewing.com/

https://www.motionrc.com/products/fr...mm-edf-jet-arp

http://www.rc-castle.com/index.php?r...Jet+Kit+Silver

The original has a length of 14.7m and a wingspan of 7.15m,

https://en.wikipedia.org/wiki/Mikoyan-Gurevich_MiG-21

whereas the model has a length of 173cm and a wingspan of 80cm,

which makes the model a ~1:8.9 scale (almost exactly the same scale as the FW A-4 Skyhawk).

This particular model is suppose to depict the third generation "MF" variant (with enlarged dorsal spine), as described here:

http://www.mig-21.de/english/technicaldataversions.htm

Direct link to the pdf instructions : https://cdn.shopify.com/s/files/1/10...33136327299338

I plan to install my own power setup, an FMS 80mm inrunner fan, as described here:

https://www.rcgroups.com/forums/show...EDF-fan&pp=100

The main reason is that the FMS fan is a lot lighter than the stock (or even non-stock) FW fan plus it has a better inrunner motor.

I have the same setup in the A-4 Skyhawk and it works really were there, no need to change anything

The paint scheme will the Russian aerobatic one, red on top and silver on the bottom. More or less the same scheme I have in my scratch-built MiG-21 105mm edf:

https://www.rcgroups.com/forums/show...lt&perpage=100

EDIT : video added


MiG-21 by Freewing with FMS Inrunner Fan - Big Loops 4K (3 min 37 sec)


.

Freewing MiG-21 80mm fast flybys and nice slow rolls (3 min 39 sec)

Posted by Herb | Nov 04, 2017 @ 11:46 AM | 11,511 Views
Acquired this new nice small Hawk as a replacement for my 70mm FW F-104 missile ... The 104 flies very nicely but in the silver scheme is a bit hard to see on the landing approach when it comes toward you.

With the idea of moving my power setup from the F-104 tom the Hawk, I got just the $169 airframe ("Arf-Plus") kit :

http://sz-freewing.com/

https://www.motionrc.com/products/fr...awk-t1-red-arp

It is a pity they don't make a similar, no frills & lightweight one, in a bigger size ~90mm

I love the way Hawks fly, this is my ninth edf one from what I can count (the first one was a Gloeckner kit with a Schwerdfeger 69mm fan) ... Too bad the larger FW offerings are either airliners (A-10) or that overcomplex F-14.

It turns out this Hawk also runs rings around my overbelled and overwhistled FW 90mm F-16 even though the latter has a very powerful JetFan / HET 700 combo in it .

Edit: Short video added:

BAe Hawk Red Arrows edf by Freewing Maiden (4 min 17 sec)


.

BAe Hawk FW 70mm landing (0 min 22 sec)
...Continue Reading
Posted by Herb | Oct 20, 2017 @ 01:17 PM | 11,305 Views
I've used gyros for years in my EDF jets ... They can be useful for takeoff and landing, and occasionally in flight when there's a lot of wind.

Without getting into some sort of religious war : I love gyros and use them all the time, under the right conditions (eg crosswind, a lot of wind, some landings etc).

Nevertheless it makes sense (to me) to first get the jet to fly right without a gyro, by

* simple mechanical adjustments

* sensible throws

* correct CG

* correct wing & tail incidences

* correct thrust angle(s)

* correct stance

* sensible main gear position

and later have fun with the gyro on a model that is now at least set up half right Instead of having some chinese mystery electronics just try to fix everything in one swoop. That's at least how I do it.

Here's the gyro in question :

https://www.banggood.com/Hobby-Eagle...-p-991417.html

https://www.banggood.com/Hobbyeagle-...l?rmmds=search

https://www.amazon.com/HOBBYEAGLE-Co.../dp/B0123C57LE

http://www.hobbyeagle.com/gyros/a3super2.php?lang=en

This particular gyro has a number of fancy features, but I only use the most basic ones (KISS principle)

The many options can be confusing, but I use the "NORMAL" mode exclusively, and most of the factory DEFAULT settings. For ex. I never used the "Auto-Balance" , the "3D-AVCS" or the "Auto-Hover" features. I also use the standard (default) setup for servos eg. 50Hz.

As a result, there's hardly anything...Continue Reading
Posted by Herb | Sep 16, 2017 @ 12:15 PM | 16,719 Views
Got this one as an "Arf Plus" kit from MRC for $249 - including shipping to Cali :

http://sz-freewing.com/

https://www.motionrc.com/products/fr...mm-edf-jet-arp

Will install my own 80mm inrunner motor fan with a yep 150A esc,

https://www.rcgroups.com/forums/show...EDF-fan&pp=100

Was not going to use the outrunner fw fan that comes with the pnp kit, although the performance should be rather similar, at least to the comparable FW inrunner version.

The original Douglas A-4 Skyhawk had a wingspan of 8.38m and an overall length of 12.22m :

https://en.wikipedia.org/wiki/Douglas_A-4_Skyhawk

whereas the model has a wingspan of 940mm and a length of 1430mm, which gives as an overall scale for the model of ~ 1: 8.91 (from the wingspan numbers).

The paint scheme on mine represents an A-4P of the Argentinian air force around ~ 1982 so it's usualy referred to as the "Falklands" ("Malvinas") scheme.

.

Videos added :

A-4 Skyhawk by Freewing - FMS 80mm fan 4K (3 min 2 sec)



A-4 Skyhawk 80mm EDF by Freewing with FMS inrunner fan (3 min 38 sec)
...Continue Reading
Posted by Herb | May 16, 2017 @ 11:47 AM | 17,860 Views
Got this one from HK for $215, airframe only - but with complete metal landing gear, some servos (gear door) and a simple gear door sequencer.

http://sz-freewing.com/

http://www.f-hobby.com/freewing-su35-pnp-and-kit-p-66

Had no use for the junk fans, junk outrunner motors and escs that the pnp version comes with for an extra $150

The original Sukhoi Su-35 has a wingspan of ~ 15.3 meters and a length of ~ 21.9 meters,

https://en.wikipedia.org/wiki/Sukhoi_Su-35

whereas the model has a wingspan of 108 cm and a length of 163 cm, which gives as an approximate scale ~ 13.8 : 1 .

Some but not all Su-35's have thrust vectoring ... the Su-37 variant does as well.

Will be repainted in a different camo scheme, similar to the one shown below.

Power will be from twin WeMoTec MiniFan EVO 70mm or a comparable 10-bl setup, with either a HET 2w, Arc or Mad Thrust, or similar , quality in runner motor on 6S.

A proven setup very similar to what I have in my Sukhoi Su-47 Berkut :

https://www.rcgroups.com/forums/show...0mm-EDF&pp=100

....Continue Reading
Posted by Herb | Apr 12, 2017 @ 04:03 PM | 17,840 Views
I picked up one of these as an "airframe only" from MRC for $159 :

http://sz-freewing.com

https://www.motionrc.com/products/fr...mm-edf-jet-arp

They also sell it (the airframe only but with LG) for $104 in China :

https://www.aliexpress.com/item/RC-a...782118518.html

It seems slightly larger than my JePe F-16 (35" ws vs 31" ws) :

https://www.rcgroups.com/forums/show...by-Jepe&pp=100

so a rough comparison will be interesting.

On this one the wingspan is 88 cm and the length is 131 cm, whereas the real one has a 9.96m wingspan at a 15.06m length

https://en.wikipedia.org/wiki/Genera...ighting_Falcon

so the model is in the ~ 1:11.4 scale range.

I plan to possibly have a tailerons only setup, to reduce wing drag.

Fan will be an 70mm one with quality inrunner, and a 150A YEP esc I already have.

Finish will be in a simple 1984 Belgian TigerMeet scheme, which I have done a few times before ...

.

Edit: Video added Oct 22

F-16 70mm EDF by Freewing with WeMoTec EVO fan (3 min 17 sec)


.

Takes off and lands like a feather :

.

F-16 FW 70mm edf takeoffs and landings (1 min 14 sec)
...Continue Reading
Posted by Herb | Mar 03, 2017 @ 01:21 PM | 23,595 Views
I just got this new FMS 80mm inrunner motor plastic fan from China,

https://www.rc-castle.com/index.php?...roduct_id=6674

http://www.banggood.com/FMS-80mm-12-...p-1125125.html

http://www.fmsmodel.com/fms-80mm-duc...0-kv2000-motor

For $76 it includes (what looks like) a nice inrunner motor, and that was the main reason for buying it. Many of these chinese fans nowadays include some $10 junk outrunner motor that I really don't care about

I am not familiar with that particular motor brand ("Predator") ... we shall see

As is quite clear and explicit from the FMS and Bangood sites, there is only one version of this fan with a 3270 2000kv motor.

Different measurements that people might or might not get could depend on a weak battery, incorrect transmitter endpoints, free-standing vs. installed in edf jet, and wrong esc setup (wrong timing not suited to a 4-pole inrunner) etc.

EDIT 1-10-2018 : Price just went up to $109, and then back down to $76, on bangood

.
Posted by Herb | Jan 28, 2017 @ 02:36 PM | 23,934 Views
I got this one as an "airframe only" kit for $129

http://www.bananahobby.com/8-ch-blit...f-jet-kit.html

https://lxhm.en.ecplaza.net/products...47-rtf_1410471

http://www.f-hobby.com/sky-flight-su...or-thrust-p-13

http://www.generalhobby.com/su47-ber...ion-p-816.html

https://www.turbines-rc.com/en/jets-...p-upgrade.html

https://ru.aliexpress.com/item/Twin-...795390878.html

The manufacturer is listed as "Sky Flight Hobby", and occasionally as LX or Lan Xiang.

The kit version is fine for me, as I really don't need all the extra junk motors, junk fans and junk escs

Will strip out all that thrust vectoring stuff, plastic nozzles, plastic mounts etc as well, and as a result lighten it up as much as possible.

Power setup will the twin WeMoTec Mininfans EVO 70mm on 6S.

Here's a couple of videos of how mine flies :

Sukhoi Su-47 Berkut (3 min 21 sec)


.

Sukhoi Su-47 Berkut (3 min 50 sec)
...Continue Reading
Posted by Herb | Jan 06, 2017 @ 10:17 PM | 16,537 Views
I got the F-16C from MRC a couple of weeks ago, very simple and straightforward to put it together...

http://sz-freewing.com

https://www.motionrc.com/products/fr...mm-edf-jet-pnp

She's a bit smaller than my Tam F-16 (which is 12-th scale) and a bit larger than my old all molded JePe F-16.

On this one the wingspan is 102.3 cm and the length is 152.2 cm, whereas the real one has a 9.96m wingspan at a 15.06m length

https://en.wikipedia.org/wiki/Genera...ighting_Falcon

so the model is in the ~ 1:10.2 scale range.

.
Posted by Herb | Dec 21, 2016 @ 07:02 PM | 18,073 Views
I got this from MRC as an airframe kit only for $159,

http://sz-freewing.com

https://www.motionrc.com/products/fr...f-jet-arf-plus

http://www.rc-castle.com/index.php?r...rch=F-104+70mm

http://www.rc-castle.com/index.php?r...rch=F-104+70mm

http://www.hobby-paradise.com/en/en/...e.html?sort=4d

It is made out of EPO = Expanded Poly Olefin (which is NOT EPS = Expanded Poly Styrene).

It includes pretty much everything except fan and esc (and of course receiver). I really had no need for another $20 outrunner edf plastic fan .

Seems pretty well made for what it costs, the overall near-scale outline and the paint job look pretty good.

More importantly the ducting is actually pretty decent compared to some other FW offerings !

For some reason all the ones I have seen in person crashed badly, nevertheless the F-104 is generally a decent EDF (or turbine) flier.

The original F-104 had an overall length of 16.66m and a wingspan of 6.36m,

https://en.wikipedia.org/wiki/Lockhe...04_Starfighter

whereas the model has 1.403m and 0.656m respectively, giving a scale of 11.88 (length) to 9.70 (wingspan), or on the average ~10.8 scale.

Here's a video of how mine flies (it gets faster as the batteries warm up) :

F-104 Starfighter 70mm EDF with WeMoTec MiniFan EVO (1 min 32 sec)


.

F-104 Starfighter Freewing fast & low Flybys (0 min 36 sec)
...Continue Reading
Posted by Herb | Oct 29, 2016 @ 08:19 PM | 16,419 Views
Started to look at the various pieces as the came out of the FlyFly box, it seems all the underwing tanks are missing.

Other than that, the kit seems in reasonable shape. I got it from hobby88.com (which is basically flyfly),

http://www.hobby88.com/shop/index.ph...d1beeb4f8d431c

http://www.scaleflying.com/Hawker-Hu...an_p_2409.html

JePe's modifications are described in detail here :

www.jepejets.com/blog/?cat=10

....Continue Reading
Posted by Herb | Oct 19, 2016 @ 12:11 PM | 18,681 Views
I got this kit some time ago from Dragon Hobby for $64 which is not bad, so I don't get all the extra junk I don't need.

https://www.dragonhobbyusa.com/edf-jets/90mm-edf.html

Setup is a JetFan 90mm with HET 650 motor on 6S (3S+3S) 4000's , this is the setup I took out of that POS Freewing Fiat G-91 with atrocious ducting that always felt overweight, underpowered and never flew half right

.