Lumenier RB2205C-12 2400KV SKITZO Ceramic Bearing Motor
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Old Mar 25, 2012, 02:49 PM
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max a Parkjet can suffer is about 140gr in LiPo

You can go even higher in weight . I am using successfully this pack :

http://www.hobbyking.com/hobbycity/s...dProduct=18208

Actually, the plane flys even better with this heavier battery than with a 100 g pack at least when it's windy .

Honestly, I can fly whatever from a 100g 3S Rhino pack to this 1300-4S -155g pack and the plane is always as easy to launch and feels very light no matter the battery weight.

I believe that this plane could carry even more weight if we can find room for it.

I registered today 166 km/h and 177 km/h in a dive with my 70g-2700-motor with a Rhino-3S-1050-30C pack on a 4,75x4,75 prop .

Unfortunately, the canopy popped off when I changed battery for a 4 cells pack and the pitot tube was damaged for the second time . Again I couldn't register the speed but man, that was really fast .

Finally I tried my best pack, the nano-tech-4S-1300-45C and it became quite "brutal" and a bit scary !! What a blast !!!!

Hopefully I"ll manage to repair that speed recorder and I"ll finally get a speed reading on 4 cells .
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Old Mar 25, 2012, 03:34 PM
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222 km/hr Parkjet flyer
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Note I did say - 140gr depending on motor etc.

I have a really heavy 450 helicopter motor in mine ... so that causes real bad tail weight. I cannot balance it with the 920 4S as the pack is too long and I cannot get it fwd enough. My 1800 3S is ok thouigh as it's shorter, heavier and I can get weight more fwd.

Once I fit the 5000kv or the 3800kv I have ordered - they are much lighter motors and I will then have greater variation in packs and of course then I can look at more than 140gr.

177 kph .... not bad ... we just need to pitch you up on prop .. maybe a few extra rpm and you'll be screaming past me !

I sincerely believe less than 5" pitch will hold you guys back. Once I get a reliable launch ramp in place - i shall be going up again in pitch ........ probably cutting back a 7 x 6 prop to 4.5 x 6 or similar ... have to test and see what amps draw vs thrust is ... maybe less diameter ..

Glad you hit insane speed though jpette ............. I know I had to let my heart settle after !! it is INTENSE !
Old Mar 25, 2012, 03:45 PM
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222 km/hr Parkjet flyer
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As already said - this is my intended once I re-motor the PKJ :

http://www.hobbyking.com/hobbycity/s...dproduct=21341

1500mAh 4S 25C ............. its more compact than the nano-tech and to be honest - I have a couple friends who have given up on nano's after both of them found not long after starting to use them power ouput was no better than a standard LiPo, in fact some of them were worse. 25C is more than enough I reckon..... 25C x 1.5A = 37.5A .... burst at 35C x 1.5A = 52.5A .... I can live with that ............
Old Mar 25, 2012, 03:53 PM
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rc foamfighters style hk parkjet


here is the slow progress on my rc foamfighters style hk parkjet, sooo stiff already, next is the fiberglass weave
Old Mar 25, 2012, 07:04 PM
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Anyone considered strakes on this plane?
Might not be feasible, just a thought.
Old Mar 25, 2012, 11:55 PM
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Finished mine today. AUW is 11.7 ounces with a 3S1320 lipo. 230 watts per pound should make it fly rather well. Running a 3200 KV Wicked JR motor.
Old Mar 26, 2012, 01:13 AM
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Glow 😡 no no no
Quote:
Originally Posted by The Don View Post
Finished mine today. AUW is 11.7 ounces with a 3S1320 lipo. 230 watts per pound should make it fly rather well. Running a 3200 KV Wicked JR motor.
Looks very nice Don.
Old Mar 26, 2012, 08:35 AM
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don, paint looks slick!!! what kind of paint is that?
Old Mar 26, 2012, 08:35 AM
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They all look fabulous till the first few launches !!

My next ones will not have paint jobs at all .... too much hassle to touch up. I shall use shrink covering film - only trouble then is that any stress cracks etc. will be hard to see.

I reckon my next will be so outlandish in colour scheme, no-one will want to launch it !!
Old Mar 26, 2012, 11:55 AM
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168 km/h today on 3 cells

186 km/h on 4 cells .

It was so windy today that I couldn't make any nice straight pass and didn't dare to let it go far enough to max out the speed .

This is my new favorite plane . What a blast to fly .

Don

You could try with one of your wicked 2700 on 4 cells or the 3000 on 3 cells .
They should be perfect motors for this beast
Old Mar 26, 2012, 12:52 PM
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Originally Posted by morris.hans View Post
don, paint looks slick!!! what kind of paint is that?
The blue is Testors Model Master "Blue Angel Blue" and the yellow is just a can of enamel from the local hardware store I had.

Don
Old Mar 26, 2012, 01:39 PM
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very nice, im going with colored packaging tape: easy to apply, easy to fix, light, bright, shrinks in heat, cheap
Old Mar 26, 2012, 04:38 PM
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Quote:
Originally Posted by Jpette View Post
Don
You could try with one of your wicked 2700 on 4 cells or the 3000 on 3 cells .
They should be perfect motors for this beast
Yes it would be a rocket. I think the next one will have that setup as the airframes are sure cheap enough!

Don
Old Mar 27, 2012, 02:01 AM
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222 km/hr Parkjet flyer
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Quote:
Originally Posted by Jpette View Post
168 km/h today on 3 cells

186 km/h on 4 cells .

It was so windy today that I couldn't make any nice straight pass and didn't dare to let it go far enough to max out the speed .

This is my new favorite plane . What a blast to fly .

Don

You could try with one of your wicked 2700 on 4 cells or the 3000 on 3 cells .
They should be perfect motors for this beast

C'mon guys .......... UP that pitch !! You know you want to !! Nice 4.5 x 5 .. get her motoring !! But there yer go ... 186kph ... getting there ... SLOWLY !!
Old Mar 27, 2012, 02:44 AM
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It's true that I am going up in speed slowly .
That's my character to enjoy as long as possible any speed increase before I move on.
I am still experimenting on my CG that was too much forward at the top end of the fingers hole.

I managed to fix my pitot tube but still had problems with it and when it finally started to work , I had only two batteries left .

When I am sure about the actual speed by repeated measures, then I'll prop up for a 4,75x5,5 to get a little bit more pitch .

If that's not enough , there is still the 5,25 x 6,25 to try but that could be pushing a bit on the motor .

186 km/h was with a 15 mph tail wind so I believe that the ground speed was far above 200 km/h and it felt insanely fast for such a small airframe .

The plane was holding fine at thoses speed without any reinforcement but I could see my wing shaking !! It would be wise of me to add some spar in it before it desintegrates in flight .


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