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Old Apr 09, 2015, 11:12 PM
keithmoor is offline
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StratAir Raketenwurm F5F

Finally did it ---ordered a Raketenwurm F5F from Stratair ---will arrive within the next few weeks and I will post pictures.

Specs:-

Wingspan 2300mm
Length 1100mm
Weight 550g
Total Wing Area 36.0dm
Spinner 36mm

Will be running a Neu 1115/2.5d 6.7 2100kv ( just because I have on hand) on 8s 2200mah in a 4s x 2 configuration.

Alternatively I have an ARC 28/58/1 with KPG 5.2 in my Model of many names ---Wilco /Hawk/Inertia that will run on 7s--- but prefer to keep it in that.

CC 100 Edge

Servos --Hyperion DS09 AMD all round

Enerloop AAA 800mah 4 cell Receiver Battery

RFM 16 x 16 slim prop or a 16 x 13 plus 5 degree twist

Numbers ---93Amps 2545 Watts 10584 Thrust 7400 Revs 117 MPH Pitch Speed

Estimated AUW between 1500g and 1600g so whilst not overly power-full should boogie along OK.

This should perform better than a Fully loaded 3 M weighing in @3100 g plus on 5ooo watts.

Estimated level flight over 100mph with a great glide.

Any thoughts or assistance appreciated guys

Regards Keith
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Old Apr 10, 2015, 03:00 AM
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Please do not use Eneloop's. Just don't worth it.
Rather go with 400mAh LiPo + BEC (i.e. Castle 10A BEC).
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Old Apr 10, 2015, 08:11 AM
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Quote:
Originally Posted by JAyThaRevo View Post
Please do not use Eneloop's. Just don't worth it.
Rather go with 400mAh LiPo + BEC (i.e. Castle 10A BEC).
Did you have a failure---I thought Eneloops would be safer than an extra Bec ?

I had a CC Bec fail on another Glider and blow my MKS Flap servos

Regards Keith
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Old Apr 10, 2015, 09:17 AM
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Quote:
Originally Posted by keithmoor View Post
Did you have a failure---I thought Eneloops would be safer than an extra Bec ?

I had a CC Bec fail on another Glider and blow my MKS Flap servos

Regards Keith
Not want think that CC bec fail.....
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Old Apr 10, 2015, 09:35 AM
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Congratulations, it's a beauty!!! My grains of salt:

1115 will give you warm-liner performance in an f5f ship. With a wing that big, I would stay clear of over-square props. An excellent F5F prop is the pils 17.5x17.5, because you need a good amount of thrust to drag that big wing up into the stratosphere. I would suggest something along the order of a 1509 or 1409. Also, F5F tend to have large surfaces, you may want to consider upgrading to ds095 to avoid wing flutter....

Quote:
Originally Posted by keithmoor View Post
Finally did it ---ordered a Raketenwurm F5F from Stratair ---will arrive within the next few weeks and I will post pictures.

Specs:-

Wingspan 2300mm
Length 1100mm
Weight 550g
Total Wing Area 36.0dm
Spinner 36mm

Will be running a Neu 1115/2.5d 6.7 2100kv ( just because I have on hand) on 8s 2200mah in a 4s x 2 configuration.

Alternatively I have an ARC 28/58/1 with KPG 5.2 in my Model of many names ---Wilco /Hawk/Inertia that will run on 7s--- but prefer to keep it in that.

CC 100 Edge

Servos --Hyperion DS09 AMD all round

Enerloop AAA 800mah 4 cell Receiver Battery

RFM 16 x 16 slim prop or a 16 x 13 plus 5 degree twist

Numbers ---93Amps 2545 Watts 10584 Thrust 7400 Revs 117 MPH Pitch Speed

Estimated AUW between 1500g and 1600g so whilst not overly power-full should boogie along OK.

This should perform better than a Fully loaded 3 M weighing in @3100 g plus on 5ooo watts.

Estimated level flight over 100mph with a great glide.

Any thoughts or assistance appreciated guys

Regards Keith
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Old Apr 10, 2015, 09:36 AM
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Eneloops can work very well.
I've been using them in my competition F5B models and others for years without issue.

Lenny
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Old Apr 10, 2015, 02:10 PM
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Awesome Keith, look forward to following your progress. +1 on the 095, esp for flap. Re motor, r you looking to build as light as possible, will be interesting to see which motor balances best. Might be plane is built for quite specific motor weight, i know i had to add nose weight on bf1 when flying light. Eneloops for me, aa 2000.
For those competition flyers, is f5f a popular class? Or is it all f5b at events?
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Old Apr 10, 2015, 03:39 PM
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Well, first you will not save any weight by going the Eneloops way and secondly you will not have a constant voltage on your output, which might not be such a problem for fun flying.

@must:
Over here in Austria F5F is more popular than F5B
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Old Apr 11, 2015, 01:21 AM
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Quote:
Originally Posted by Lenny970 View Post
Eneloops can work very well.
I've been using them in my competition F5B models and others for years without issue.

Lenny
Will probably stay with AAA 800mah ( I have 4 packs all new) and monitor them as I go along ---if in doubt I chuck them out.


Magrinsi
The CC Bec pushed 9.5 volts through the MKS Flap servos --- shown on telemetry--at the time I was using a 4s lipo --- these days if I run a Bec I run separate 2s lipo of 400/1300 mah

La528it

Will start with Neu 1115 and upgrade if necessary-----maybe I shouldn't say if --this SPEED is an addiction

Will look at MKS 6125 mini on Flaps after testing.

Regards Keith
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Old Apr 15, 2015, 10:05 PM
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I am jealous, I have a IIb and love it. Flying on old f5f voltage at 3s, even though this is an f5b airframe. Always gets attention at the field; even the jet guys stop and watch.

Is that airframe up to those power levels you are talking about? F is a 12 volt class and you are edging towards 30 volts and maybe even 3-4kW. f5f airframes were not designed for that. Anyone know if f5f even still exists? Never hear of it anymore here in the states...seems to have gone away, and along with it, its entry level hi perf origins.
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Old Apr 16, 2015, 01:51 AM
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Excuse me, did you say entry level These days it's effectively f5b with a larger span, at least that's why I keep flying them


Quote:
Originally Posted by kitfoxdrvr View Post
I am jealous, I have a IIb and love it. Flying on old f5f voltage at 3s, even though this is an f5b airframe. Always gets attention at the field; even the jet guys stop and watch.

Is that airframe up to those power levels you are talking about? F is a 12 volt class and you are edging towards 30 volts and maybe even 3-4kW. f5f airframes were not designed for that. Anyone know if f5f even still exists? Never hear of it anymore here in the states...seems to have gone away, and along with it, its entry level hi perf origins.
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Old Apr 16, 2015, 05:49 PM
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Originally Posted by la528it View Post
Excuse me, did you say entry level These days it's effectively f5b with a larger span, at least that's why I keep flying them
Agreed F5B with a larger span---better for thermels AND still plenty of Speed

Regards Keith
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Old Apr 16, 2015, 07:55 PM
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Originally Posted by la528it View Post
Excuse me, did you say entry level These days it's effectively f5b with a larger span, at least that's why I keep flying them
Originally it was envisioned as a primer for f5b, with lower power setups and largerairframes = less expensive and easier to fly. Not so much any more, and with no transition plan to lithium cells that I am aware of, not an FAI event any more either. True super-sport aircraft, just the way I like it!

Can't wait to see how the Rocket flies!
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Old Apr 17, 2015, 05:40 AM
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F5F has been transitioned to Lithium. According to FAI rules F5F is limited to 4S.
Minimum surface area 36dm2 (F5B: 26.66dm2).

F5F is still flown actively in many countries in Europe und FAI rules.

Although sometimes seen as an intermediate class, it's pretty similar in complexity as F5B. Top-performance depends an very exact flying, speed-management needs to be even more precise than F5B. Motors are similar to B, airframes have a similar cost, it's not surprising there have been discussions about the future of F5F.

Gerben
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Old Apr 17, 2015, 10:29 AM
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I looked it up and you are correct, listed as a Provisional Class. I loved the description in the Table of Contents: "...for Juniors and Seniors". Not sure what that means. 4 cells and 1300 Watt-mins compared to 10 cells and 1750 Watt-mins for -B.

I am not aware of any competition here, though. Of course, even F5B has died out in many areas here.

Gerben, do you know how many laps the good pilots are getting in -F? I think Wolf said he was getting better than 40 laps on 10 ni cells back in those days.
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