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Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 4/9/2009 10:43 PM   
Esprit Dean


 

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From: PALM BAY, FL, USA
Status: offline 		This is an extensive Build thread, flight log, and video of the Sapac EDF T-45 & L-39 Composite with the new Storm 70 unit from Hoffman Mangetics. Can't wait to see how it will perform, they say over 4.3lbs of thrust. Im thinking the L-39 will do 145MPH plus. Please standby, I will being posting asap.

All of the following equipment being used has been provided by EspritModel.com

Thank you Guys!

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 4/10/2009 5:34 AM   
Nathan



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Status: offline 		I for one am looking forward to seeing you progress on this build. After speaking with both these companies at the Toledo show I really think your combination with the SAPAC airplane and Storm 70 is sure to be very turbine like in quality and flight performance.

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 4/15/2009 10:42 PM   
Esprit Dean


 

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Heres some pictures we took of the new fan unit that Esprit just got in, Please look at the bottom picture.

Of course I'm going to use a 5S setup so I went with the Castle Creations 125 so what I'm going to have to do is cut the wire down on the ESC one inch and the cut the wire down on motor by about one inch.

You have to be really carefull to keep the wires all the same length because it can alter the timing if you change it around too much.

After we get it done were going to have some awesome High-Def video on this plane before we go to Joe Nall, were also going to clock this thing
so we can get an exact speed out of it with this speed.

-Shall the building begin!!!!!!

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 4/30/2009 1:14 AM   
Esprit Dean


 

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Status: offline 		Yeah you guys are right, I'm going to mount the ESC outside of the tailcone so it does not constrict the airflow to the motor.

You know examining the fan unit I came to the conclusion that the tailcone of the Storm fan unit actually creates a vacuum that actually delivers to the front of the fan unit passing through the motor. So the way most motors cool down in the fan units is from spinner to tailcone which is actually the exact opposite compared to the Hoffman Storm which cools from tailcone whole through the motor to the spinner, WHO WOULD OF THOUGHT!!

Cant wait for the Joe Nall people are going to flip when they see this thing fly.

I came back from vacation so we will get some detailed build info very soon.

Dean

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 10/22/2009 4:41 AM   
koolaid535


 

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Status: offline 		has anyone used these retracts on the L-39
http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=8346&Product_Name=Small_Air_Operated_Retracts_kit___2-WayValve__#

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 11/14/2009 5:48 AM   
Ibanez408


 

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 11/30/2009 12:49 PM   
jdhughen


 

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Status: offline 		Hey Dean,

what happened here? did you ever get it flying? got any info for us ?

Joel

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 6/11/2010 4:20 AM   
zlin50ls



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Status: offline 		I'm going to use the same Hoffman 70 Storm for my Sapac L-39 composite jet. After installing the EDF unit, this jet has the potential to be fast and heavy. Much too heavy for my liking, so to reduce wing loading I've decided to build a sport wing. Instead of using the Sapac wing at 32" w/o wing tanks I've increased the wing area consdierably by making a 41" wing. The thicker air foil plus additional surface area will really help. Here are some photos of my progess. I will add more photos when the wing is finished.

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 6/11/2010 4:42 AM   
papajeff



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Status: offline 		Zlin,

Like you, I wonder what happen to Esprit Dean?  It is unlike him to start a project and then
not post anything for over a year.  I sure hope that he responds here to let us know what's up.

Now, you do nice work!  Your new wing is certainly well done and it should work well.  I
built the SAPAC L-39 composit and installed the Storm 70, castle ICE 100 ESC, CCBEC,
Hitec HS5065MG servos, Spektrum AR7000 receiver and will be using the Enerland 43C
4S or 5S packs, but did not get a chance to fly it last season.  I plan to get the Maiden
 flight accomplished in the next few weeks and can post the results here, if you like.

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 6/11/2010 5:30 AM   
zlin50ls



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Status: offline 		Papajeff, Yes I'd like to know your flying results with your jet. I could've gone with a stock edf unit and only used 3s lipos, and that would've reduced weight, but I was intrigued by the Storm 70 EDF unit. I'm spoiled by flying light weight EP models and appreciate the importance of wing loading. It's amazing to me how much performance difference there is when the models are lighter. This is very true with jets as well, I always read jet build threads stating "keep it light".

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 6/11/2010 6:51 AM   
papajeff



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Status: offline 		Zlin,

I tend to agree with you about building light or attempting to assemble an ARF model to come
in at the suggested flying weight.  We have found, with some of our EDF build projects, that
a slight increase in weight, usually by increasing the cell count for the battery pack or upgrading
to a more powerful motor, is offset by the increased power.  This, of course, depends on the
body style of the particular model that one is working with.  I am pleased that we will both have
the opportunity of finally getting to see what the Hoffman Storm EDF unit can do in the SAPAC
L-39.

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 6/12/2010 3:04 AM   
Extreme_RC



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Status: offline 		Personally I think the Sapac composites fly best on the stock setup, good balance of power and amp draw. I built and flew the very first T45 version years ago and it was a super sweet flier even on old tech 20c 4000mah cells that would barely push 800w. It was 1650 grams ready to fly no gear.

My current Hawk is full house with factory retracts and those gorgeous oleo struts (which so far have stood up to a couple of very hot landings as I get used to it in our tight field) still with the stock fan and MB1 motor, running on 4000mah 4s1p 25c packs, 950 watts and 1900+ grams AUW. gets off our cricket strip with a little bump at the end to assist (carrier takeoff )

I use flaps to take off, no issue, landing with full flaps is nice now I got the distances worked out, you can come in with power on and flair nose up for an alfa landing.


Here is the original T45 video from 2008, I have new vid to edit of the new Blue Hawk, will try and get that done this weekend.
http://www.youtube.com/watch?v=LcoGIaEjn3Q

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 6/12/2010 6:02 AM   
papajeff



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Status: offline 		Extreme,

The Blue Hawk is a beauty and I look forward to your video.  Did you do a build thread on it?

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 8/12/2010 4:31 PM   
papajeff



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Finally, after many delays including the fact that Hoffman Magnetics has departed the RC arena, the SAPAC
L-39 composit, powered by the Storm 70, has flown!  And extremely well at that.   



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< Message edited by papajeff -- 8/13/2010 12:22 AM >

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 8/13/2010 3:03 AM   
jayhrc


 

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Status: offline 		Been flying my L-39 with the Hoffman Wild Beast/wemotec pro/CC125/XPS 4s 4000/1900 watts/4+ lbs of thrust. Plane is a bullet. Problem with the Strorm you need 5s to get the same thrust as the Wild Beast on 4s. Amps are higher but lighter weight. Great combination. Currently using this setup in the new F-86 from Horizon. Much faster because of swept wing.

Regards

Jay H

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 8/13/2010 6:04 AM   
papajeff



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Status: offline 		Jay, I am pleased to hear that you have had success flying your L-39 with Hoffman power.  My set up
uses the Storm 70 unit, but it is the one that calls for a 4S pack.  With a Spektrum AR7000 Rx, Castle
ICE 100, Castle CBEC, and an Enerland 43C / 4S 4400mAh pack  the watt meter results are;  98A and 
1800W at just about 4 pounds flying weight which is close to 450w/lbs.  Now that we know the L-39 can 
perform with this set up, it's time to install a set of the new Lander electric retracts. 


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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 8/17/2010 6:34 AM   
papajeff



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Status: offline 		While checking the entire L-39 after the successful Maiden flight, I remembered that the Castle ICE 100
has the data logging function and I reviewed the data to find that the ESC was getting extremely hot as I
had not provided any airflow to keep it cool.  So, I decided now was the perfect time to re-position the ESC
for proper cooling airflow.  All I did was to take the thin EDF hatch cover, reinforce the opening with narrow
strips of 1/8" hardwood, line the hatch cover with 1/8" hardwood, make a cutout for the ESC, tape it to the
hatch cover and attach it to the fuselage with three screws.  This should work just fine.

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 8/18/2010 2:47 AM   
mreinhart


 

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Status: offline 		Well, I just purchased Zlin's L-39 w/ the hoffman..it has the80amp ESC so I amgoing to go 4s for a while.. may upgrade to a 5s down the road,but it soundslike it will fly,and fly well, on 4s. Papajeff, are you on 4 or 5s? How many watts/amps on a 4s?

Thanks,
Matt

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 8/18/2010 4:54 AM   
papajeff



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Status: offline 		Matt,

I'm using the new Enerland 4S 43C pack and if you take a look back at post # 16 you will see all
the numbers.  But remember, my Storm 70 is the HW version that recommends using only 4S, so
I had no choice.


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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 8/18/2010 5:09 AM   
mreinhart


 

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Status: offline 		I'm generally happy if i can get 350 watts/lb, so that should be doable on the setup I have..honestly I dontknow if it is the HW or not, all I know is its the storm 70.. it should be arriving friday according to UPS..so I guess I willfind out then unlessZlin chimes in here...

You going to E-jets? im planning to have mine rdy by then.. installing HET retracts w/ scale struts, and a set of navlights in it.. gunna go all out on this one, and use it as a prep for myself on finishing out a scale plane, since I just bought a turbine, and will be building aplane for it over the winter
Kinda using this as a "turbine light"setup.. with the high wingloadng and everything, should be a good prep for it.
I got my waiver on a richmodel Keecat, that was pushing about 120mph, and have a phase 3 f-16 that does about 130ish.. so the combination of this bird, and the high speed exp with the others, (and this one, dunno what kind of speeds i will see w/ it yet) should prepare me pretty well for a turbine

I have been flying rc for about 27 yrs now, have flown everything from pattern to 3d, jets are my latest and greatest obsession hehe
M

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 8/18/2010 5:33 AM   
jdhughen


 

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Status: offline 		mreinhart,

I believe there were 2 versions of the Storm made. The Storm 70 and the Storm 70HW. the "HW" was a 3-4 cell model and the regular Storm 70 was a 4-5 cell model. Both had static thrust numbers of 4+ lbs when using the higher cell count for ea. Hoffman suggest using a 125 ESC when using the higher cell count with each model, but using the higher cell count for each model is the only way to get to the 1800w 4.3 lbs spec with either model. there's a thread on RC groups that gives a lot of the specs on each model.

http://www.rcgroups.com/forums/showthread.php?t=1031307&pp=100#post12292221

Pete "Hole Digger" (on that thread) somehow ended up with most of the remaining Hoffman stock when they shutdown and seemed to be the resident "authority" on the storm. I got one of the HW models from him last Dec. Mine came in a sealed Hoffman box marked 70HW but once out of the box I can't find any markings on the unit itself as "HW" (or any model # markings of any kind) so I wouldn't know how to tell which model one had. To get the numbers Papajeff is posting with 4s I would assume that he has a HW version? Papajeff ?? If the plane you bought has been running 4s with a 80a esc I would suspect it's a regular storm 70 cause running a HW on a 80a ESC something would give. Do you know which you have ?? if it is a regular Storm 70 I wouldn't expect to see big numbers until you go to 5s. Pete "Hole Digger" might be able to tell you how to tell which model Storm you have.

Joel

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 8/18/2010 5:46 AM   
mreinhart


 

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Status: offline 		Ive talked with him a little.. Just popped him a PM.. thanks for the advice

M

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 8/18/2010 10:25 AM   
Extreme_RC



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Status: offline 		Here is some video of the Hawk.



< Message edited by Extreme_RC -- 8/18/2010 11:26 AM >

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 8/19/2010 12:19 AM   
papajeff



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What Hawk????  That's not a Hawk.......that's a ROCKET!!!!!   Nice flying!

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RE: Sapac L-39 & T-45 Composite + Hoffman 70 Storm - 8/19/2010 12:42 AM   
papajeff



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Status: offline 		Pete,

For sure, I have the HW version of the Storm 70 and I am certain as the Spec sheet was included
in their special black plastic container.  The Item # is; STM70HW and the speed range is 54,000
rpm on 3-4 cell lipo with the "Wild Beast" motor at 4880kv with 0.007 ohms.  The regular Storm #
is; STM70 and the speed range is (the same) 54,000 rpm on 3-5 cell lipo with the "Beast" motor
at 4130kv with 0.0085 ohms. 

I also did not see anything on the EDF housing that signified which version it is, yet with both
having the potential to produce 4.3 pounds of thrust, the only difference, to me, is that the HW
can do it on a 4S pack and the regular unit needs a 5S pack.  I hope that this helps. 

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