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Herb's blog
Posted by Herb | Apr 28, 2014 @ 01:14 PM | 10,145 Views
Here's my latest project, I picked this one up at a local HS (Rob's).

Like most Kyosho products it looks very well made

http://www.kyosho.com/eng/products/r...duct_id=109840

The specs are scale 1:7, 1.8m (71") wingspan.

Recommended engine size is described as 90 to 120 ...

(The original F4U Corsair had a wingspan of 41' or 12.5 m, which gives a scale of 12.5/1.8 = 6.94:1 : http://en.wikipedia.org/wiki/Vought_F4U_Corsair )

Here's a direct link to the Kyosho instructions (34 Mb) :

http://www.kyosho.com/jpn/support/in...R_EP-GP_IM.pdf

It has been pointed out to me that it looks very similar (if not identical) to the Phoenix Model Corsair (1.80m ws):

http://phoenixmodel.com/Product.aspx?ProductId=301

the slightly smaller BH Model Corsair (1.74m ws) :

http://blackhorsemodel.com.vn/?product=corsair

and the even smaller Phoenix Model Corsair (1.49m ws)

http://phoenixmodel.com/Product.aspx?ProductId=41


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Posted by Herb | Sep 17, 2013 @ 08:07 PM | 12,177 Views
HTG MiG-15 (90mm EDF) 155cm (61") wingspan, a very nice kit! And quite close to scale

This thread in Italian or German

http://www.hobbytopgun.com/PC/Mig-15.htm

http://www.jepejets.com/jepeshop/116-mig-15-fastfoam

http://www.hobbyking.com/hobbyking/s...dProduct=24003 ($159 epo )

http://www.airshowrc.com/mig-15_hobby_top_gun.html

http://wild-technik.de/shop/product_...ucts_id=101561

The MiG-15 with shipping cost me less than a pair of BVM molded MiG-15 wing tanks

Given the 155cm wingspan of the model, the scale is approximately 1008cm / 155cm = 6.50 :

http://en.wikipedia.org/wiki/Mikoyan...urevich_MiG-15

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Flight video added Nov. 17 2013:
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MiG-15 bis 90mm HTG (1 min 53 sec)


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Posted by Herb | Sep 11, 2013 @ 01:30 PM | 13,728 Views
I got this kit for $119 from the HK usa warehouse, not bad fro the price

I started putting some of it together while I am waiting for some additional parts.

Power setup will be a WeMoTec EVO fan on 6S 4000's or 8S, depending on where the CG will end up.

http://www.hobbyking.com/hobbyking/s...dProduct=24283

http://www.hobbyking.com/hobbyking/s...ch=MiG-15+1127

It is / was sold as the "Hobbyking", "Proedf", "ProDesign" or "KMP" (Kondor Model Products) MiG-15 90mm edf.

Wingspan is around 1127 mm, length around 1124mm, expected weight rtf around 3kg.


Edit: short flight video added Oct. 27 2013:

MiG-15 90mm composite EDF (HK/ProEdf/ProDesign) (1 min 53 sec)


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Posted by Herb | Jan 26, 2012 @ 12:47 PM | 87,024 Views
The long awaited CMP (aka CMPro or China Models) Aero L-39 / L-59 Albatros 90mm EDF

http://www.chinapro09.com/OEM%20airplan/L-39.html is now out.

This thread in German

This thread in Italian

Given that the original had a wingspan of 9.46m and a length of 12.13m (L-59: 12.20m), whereas the model has a wingspan of 120cm and a length of 132cm, the scale is approximately 9.46m/1.20m = 7.9 :1 .

L-39 : http://en.wikipedia.org/wiki/Aero_L-39_Albatros

http://www.airwar.ru/enc/other/l39c.html

http://www.airwar.ru/other/draw/l39c.html


More info on the kit :

http://www.nitroplanes.com/cmp-cp09-090-kit.html

http://www.scaleflying.com/Aero-L-39...an_p_2522.html

http://www.hobbyking.com/hobbyking/s...00mm_ARF_.html

http://www.x-flight.com.hk/?sp=&p=6&...&cat0=1&id=159

http://hobbyfly.de/en/rc-airplanes-1...00mm-6767.html

http://www.ready2fly.ch/shop/USER_AR...anzeigen_ab=0&

The retracts are exactly the same as the ones sold for the CMP / HK Hawk :

http://www.hobbyking.com/hobbyking/s...dProduct=19949

I got mine from RC Aerodyne and it arrived, double boxed with no damage.

Edit: CORRECT CMP L-39 CG AFTER THREE MONTHS OF FLYING:
ca. 75-78 mm from wing leading edge at root (see picture below)



Short Video of mine (April 2012) :

CMP L-39 (Hobbyking L-59) Albatros 1200mm EDF (5 min 52 sec)


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Posted by Herb | Dec 16, 2011 @ 06:15 PM | 47,519 Views
My new little project, a Messerschmitt Me-163 Komet, 61'' wingspan. It will be FAST

This thread in German

Some basic info on the Me-163 Komet rocket interceptor can be found here : http://en.wikipedia.org/wiki/Messerschmitt_Me_163

The original Me-163B had a wingspan of 9.33m, which makes the model roughly 1:6.1 scale.

Most likely the paint scheme will be "yellow 15" kept at Raf Cosford.

The model itself is the so-called "Flyboy Models" or "BH Models" 0.60-size Me-163, 1540 mm (61'') wingspan,

and is made by CY Model : http://www.cymodel.com

http://www.cymodel.com/Cn/pro_view.asp?id=26

http://www.jfchobby.com/en/html/Prod...106&SortID=192

http://www.texasrcplanes.com/me163.html

http://www.bphobbies.com/view.asp?id...0&pid=E3715233

http://www.topd.ch/RC-Modellbau/JFC/...-von-000481253

http://www.aeromodelismoserpa.com/me...tf-p-9840.html

http://www.hebu-shop.ch/product_info...6e75280af25d03

http://www.austars-model.com/dispdet...12061052272283


Edit : Me-163 short video March 2012:

Me-163 Komet 60-inch RC (FlyBoys) (2 min 5 sec)


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Posted by Herb | Oct 13, 2011 @ 06:29 PM | 31,986 Views
Once in a while an EDF fan comes along where there's plenty of measured data to evaluate how good it is ...

Here's some nice and complete systematic data for the new 90mm JetFan :

www.ejets.at

Of great relevance of the overall fan efficiency, defined as

efficiency = (mechanical work done per unit time) / (input power) , in e.g. (N.m/sec)/Watts

A good substitute for the above quantity is, based on simple formulas relating work to fan thrust and fan efflux:

efficiency = (const.) x thrust^(3/2) / (input power)

You would imagine that if somebody is really serious about designing an efficient fan they would take the time to actually do relative measurements of different designs, in order to figure out which rotor/stator design in the end is best.

Indeed that is how serious fan designers (eg WeMoTec, Daniel Schuebeler etc.) indeed do it ...

But then often a new design comes up (nowadays every other week, in some cases a copy of somebody else's rotor, with one blade added or subtracted so it don't look like a copy ) - without any clear measurements of anything.

If it is a clear shameless copy of a DS-51 fan, then it has to be as good as the DS-51, right ?

Then the relentless overhype follows ("20% more efficient than anybody elses fan'" - to the point that now the overall efficieny adds up to 110% ), and more adverts such as "best fan I ever tried in my xx" etc.

Now, the Jetfan 90 data is interesting and accurate enough to pull out :

1) the relative efficiencies of different motors in the JF

2) the very slow rise of efficiency with power/voltage

3) the large errors inherent in all these measurements

4) the wide spread in motor efficiencies (up to 31%).

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Posted by Herb | Oct 02, 2011 @ 01:29 PM | 23,323 Views
Last month I had a chance, while spending some extended time in Paris for work, to visit the Air and Space Museum in Le Bourget.

http://www.museeairespace.fr

The museum is located within a large airport in the Bourget suburb of Paris, and is the site the Paris Airshow (which takes place usually in June).

It has an amazing collection of - what else - French (mostly Dassault) jet aircraft, including some weird looking experimental aircraft, but also Montgolfieres, some very early 20-th century planes (Bleriot), some very nice WWII warbirds (including a FW-190A and a Spitfire Mk. IX) and two Concorde.

A Visit to Le Bourget Air and Space Museum (2011) (3 min 14 sec)


Rafale A:

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Posted by Herb | Apr 02, 2011 @ 01:48 PM | 70,687 Views
Started to look at the various components last week ...

This thread in German

It's a big all fg-airex-sandwich carbon composite airframe for twin 90mm fans, made by Airworld Germany;

http://www.airworld.de/Englisch/Index.htm

the rest of the components, well you can guess where most of them (esc, batts) will come from ...

Edit : Me-262 flyby added March 2012 :

Me-262 Airworld (twin 90mm edf) flyby (0 min 18 sec)


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Posted by Herb | Nov 09, 2010 @ 07:05 PM | 240,791 Views
I just received this new CMP / CMpro T-45 arf, I have the CMP Spitfire and I like it ...

This thread in German or Italian

It is almost identical to the Hobbyking Hawk (also made by CMP or China Model Products : http://www.cmpairplane.com/ ) up to the paint

http://www.cmpairplane.com/

http://www.nitroplanes.com/cmpfitedfjet.html

http://www.hobbyking.com/hobbyking/s...40mm_ARF_.html

http://www.scaleflying.com/BAE-HAWK-...F-_p_2506.html

http://hobbyfly.de/en/rc-airplanes-1...40mm-6685.html

The Spit is a bit on the heavy side , but it seems now this Hawk is made relatively light(er) ...

The wing area on the T-45 is 24dm^2, so that makes the wing +33% larger in surface than the Sapac T-45.

Wingspan = 114 cm = 46 ''

Length = 122 cm = 49 ''

Wing area = 24 dm^2 = 372 sq in

Approximate scale 1:9

Est. weight rtf 7.2 - 8.0 lbs


CORRECT CG AFTER ONE YEAR OF FLYING:
ca. 110-115 mm from wing leading edge at root (see picture below)


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Short video (8S, HET fan) Dec. 2011 (more T-45 videos on youtube under user "Herbzqy" )

T-45 Goshawk 90mm EDF by CMP (Neu 1515 on 8S) (3 min 0 sec)


Short video (6S, WeMoTec fan) Nov. 2011:

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Posted by Herb | Jun 12, 2010 @ 05:09 AM | 31,293 Views
I took these videos and pictures yesterday (Friday June 11) at the Berlin ILA 2010 airshow.

Me-262 and Bf-109G:

Me-262 and Bf-109G at the Berlin Airshow ILA 2010 (3 min 25 sec)
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Posted by Herb | Mar 24, 2010 @ 02:47 PM | 51,762 Views
Just started my latest scratch build project, a 1/8-th scale MiG-21 MF (Fishbed J) for a 101mm fan.

This thread in German

So far I managed to find some time to patiently cut out all the fuse formers and trial fit the fan ...

It will eventually be powered by a Neu 1515 motor in a 101mm fan on a 9S 4000 setup; depending on final weight (< 9 lbs) power will be in 3.0-3.5 kW range.

Inspiration for the MiG-21 project came from another avid edf-er JC (Bidule),

http://www.rcgroups.com/forums/showt...1177686&pp=100

I found this particular plan on e-bay:

http://cgi.ebay.com/ws/eBayISAPI.dll...m=200453935022

The plan is nice and seems very well made ... will know more about the quality after the MiG has flown

Edit Jan 7 2011 : Video of the second flight of the MiG-21:

MiG-21 MF (Fishbed J) 100mm EDF (4 min 4 sec)


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Posted by Herb | Oct 17, 2009 @ 03:21 PM | 59,360 Views
Here's my latest project, a large FlyFly (or Fly Fly ) F-86 Sabre a la JePe Fast Foam,

http://www.flyflyhobby.com

http://www.jepe.org/FastFoam/sabre/sabre.htm

http://www.hobbytopgun.com/PC/F-86.htm

The model's wingspan is around 55.9 inches, the length around 55.5 inches.

The original Sabre had a wingspan of around 37 feet, so that gives the model a 1:7.9 scale.

I entirely glassed the foam airframe using multiple layers of 3/4 oz glass cloth & laminating epoxy.
Now it flies on a 90mm fan on 9S lipos (4000mAh 40C's) at ca. 2900 W.
Weight rtf is around 8.3 lbs, so it's rather lightweight for its size - but nevertheless still reasonably fast and jet-like.

Here are the original instructions. An inspiration on the surface prep was the Dutch Master JePe Fast Foam site: http://jepe.org/

The main motivation for the project was to have a nice lightweight F-86 Sabre in the 90mm fan range, suitable for some
moderate aerobatics.

F-86 Video (Jan 2010):

F-86 Sabre EDF (JePe Fast Foam) FlyFly (2 min 50 sec)


Edit Sep 7: Added Guy H's pictures (Canon 7D) .

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Posted by Herb | Jun 11, 2009 @ 12:22 AM | 43,150 Views
A few pics of my finished F-16, DS-51 fan, 12S and Plettenberg HP 220/50/A3 S P4 (50mm rotor), more details here:

http://www.rcgroups.com/forums/showt...&page=5&pp=100

Flight video :

F-16 Thunderbirds (Tamjets) Schübeler Fan 12S (HD) (4 min 33 sec)


Retract operation video:

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Posted by Herb | Nov 19, 2008 @ 08:05 PM | 43,852 Views
Pictures of the prototype Jepe Mini-Viper (aka Pyranha) ; Jepe sent me a prototype.

Very fast but also quite small...

Powered by a MiniFan 480 + Mega 16/20, more details here

http://www.jepe.org/FAQ/faq.htm
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Posted by Herb | Jan 28, 2008 @ 01:08 PM | 48,756 Views
Aeronaut Rafale twin 90mm, my second one. Twin 90mm WeMoTec Midi fans with Kontronic Fun 500-19 motors and twin Kontronic Jazz 80 controllers.

Weight rtf ca. 3.39kg (7.46lbs), power 2000-2600 Watts depending on Lipo setup.

http://www.aero-naut.net

http://www.kontronikusa.com

More details on the Aeronaut Rafale here and here, and here:

http://www.rc-network.de/forum/showthread.php?t=9823

Recent video (Jan 2010):

Aeronaut Rafale twin 90mm EDF 2010 (2 min 22 sec)


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Posted by Herb | Oct 26, 2007 @ 03:31 PM | 46,990 Views
Messerschmitt Me P.1101 based on the glass kit by Steve Neill. Powered by a Plettenberg motor in a WeMoTec HW-609 75mm fan.

A few more details here and here.

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Posted by Herb | Oct 21, 2007 @ 03:42 PM | 46,505 Views
Electric conversion of a Stein Model (SteinModel) Focke-Wulf Ta-152, Mega 30/3 brushless dd on 3S and GP lightweight mechanical retracts. Faaast.

More details here: here and here.

Focke-Wulf Ta-152 video

Manufacturer's web site: www.steinmodel.cz

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Posted by Herb | Oct 21, 2007 @ 03:21 PM | 44,183 Views
Scratch-built MiG-29 Fulcrum for twin Plettenberg motors and twin WeMoTec Minifans, from Offshore plans and original 3-d views.

A few more details here and here.

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Posted by Herb | Oct 21, 2007 @ 03:06 PM | 42,186 Views
Beautifully molded FG fuse MiG-15 bis with balsa sheeted wings, very fast (> 130 mph) and rock stable edf jet. Hacker B50 brushless motor in the WeMoTec HW-609 fan. At some point we were flying a whole squadron of them. More details here here and here.

K&A website: www.kamodels.com

2004 Video:

MiG-15 high performance EDF 75mm (1 min 2 sec)


Newport MiG Patrol video (2003) :

(Gregg F [all red], Doug A [polish camo] and myself [silver with red tail])



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