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Old Jun 07, 2009, 12:30 AM
Formerly bUd~Fokker
vvV FANG Vvv's Avatar
Australia, NSW, Eurongilly
Joined Aug 2008
2,039 Posts
Thanks for the kind words folks.

After a bit of thinking on my crash i reckon the one thing that was different on my unsuccessful launches was the fact there was no wind to lift against.

I started thinking about making an alternative launcher to lessen the risk of repeat crashes. I looked into making a bungee rubber launching ramp.
The problem was getting hold of some rubber for the job.

I then found a few pictures of dolly wheel setups and decided to make my own.

This is my first dolly and i am hoping it will work ok with a straight front wheel.
I may end up making it with a steerable front wheel which i would power with a receiver pack and a second receiver bound on the rudder channel.

The few dolly's that i read about apparently worked like a charm, hope this one will do the trick although they were used on edf jets. with this one i am a little worried about the prop catching but there should be enough distance to clear.
The saddle at the back is made from scrap depron and it has two risers either side which line up with the bottom of the fins. Front has some motor packing foam and a small bit of cf tube which will line up with a small hole in the bottom of the plane.
When the nose lifts up the rod will slip out and away i go.... hopefully!

Just waiting for the second coat of fiberglass on the bottom of the funjet to dry and it should be ready to test.
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Old Jun 07, 2009, 12:46 AM
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SeaComms's Avatar
Tewantin, QLD, Australia
Joined Jul 2006
656 Posts
Trouble launching? Whats your power to weight ratio like? The only one I have seen flying was down the local field, and he hand launches at bit over 1/2 throttle and chucks it up at about 30 degrees. it never even dips down, just rockets up from there.

He is running an old Walkera 3000kv inrunner with a 6x4 APCe on 2200ma 3S. I think its a little over propped for a 3000kv motor personaly, but it gets the job done!

Oh, and he has no glass on his, so its probably a little lighter too.
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Old Jun 07, 2009, 03:54 AM
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GryphonRCU's Avatar
United States, CA, SF
Joined Mar 2008
3,820 Posts
bUd~FokkerU2 ,

Here is a different sort of Dolly.

Rubber bands are optional

I found this pic on a different Forum.


Gryphon
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Old Jun 07, 2009, 08:21 AM
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twang's Avatar
Australia, QLD, King Scrub
Joined Jun 2005
1,368 Posts
Bud,

That looks like what I have for my Twister, which works. You may have some trouble with the rear sloping pin as it may get stuck and keep the dolly attached. A straight pin would be better.
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Old Jun 07, 2009, 09:01 AM
Great Britain
MrBen.'s Avatar
Joined Dec 2008
1,600 Posts
Quote:
Originally Posted by numb_thumb
Sweet setup for Funjet I normally recommend:

Arc 28-47-1.5 or similar
80 amp good esc or 100 amp suppo
good bec (castle or park)
6 X 4 sport prop -- balanced
4S 3850 or any battery capable of delivering 75 amps or more continuous

Good luck !!!
I have ordered the Arc 28-47-1.5 & Suppo 100amp esc, and Im going to be running it on 4's. My questions are :
  1. can anyone suggest a decent battery to use?
  2. Do I need a heatsink on the motor?
  3. And what are the best/recommended settings for the esc?
  4. What kinda wattage will this pull with a 6x4 prop?
These will be going into a new FJ airframe. Im going to get a CC bec too.
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Last edited by MrBen.; Jun 07, 2009 at 10:25 AM.
Old Jun 07, 2009, 10:11 AM
Usual suspect.
St. Louis MO
Joined Feb 2007
929 Posts
Will that Suppo 100a work on 3s??
Here, on lightflight.com they have it listed as 2-7s.
The instruction manual pdf (bottom of page) shows its programmable for Nicd and 4-7s.

Is that a typo on lighflight.com, or can you get away with 3s?


I'm starting up my FJ on 3s, then going to 4s... would like to use the same gear start-to-finish.
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Old Jun 07, 2009, 10:22 AM
Great Britain
MrBen.'s Avatar
Joined Dec 2008
1,600 Posts
Well the pdf instructions on the foot of the page you linked to shows its programmable from 2 to 7 cell lipos
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Last edited by MrBen.; Jun 07, 2009 at 10:32 AM.
Old Jun 07, 2009, 10:50 AM
Usual suspect.
St. Louis MO
Joined Feb 2007
929 Posts
Right... but at the top it doesnt mention the 100a version, that link stops with the 80a.

This is the link to the pdf for the BPHobbies version, specific to the 100a.

So.. I dunno...?
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Old Jun 07, 2009, 11:42 AM
Great Britain
MrBen.'s Avatar
Joined Dec 2008
1,600 Posts
I suggest you contact dave @ lightflight. Im sure he will be able to confirm either way.
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Old Jun 07, 2009, 06:27 PM
Registered User
Bay Area, CA
Joined Sep 2007
1,162 Posts
Quote:
Originally Posted by est1976
I have ordered the Arc 28-47-1.5 & Suppo 100amp esc, and Im going to be running it on 4's. My questions are :
  1. can anyone suggest a decent battery to use?
  2. Do I need a heatsink on the motor?
  3. And what are the best/recommended settings for the esc?
  4. What kinda wattage will this pull with a 6x4 prop?
These will be going into a new FJ airframe. Im going to get a CC bec too.
1. thunderpower 4S 3850 or equivalent
2. absolutely. Buy GWS heatsinks and cut the fins off for a nice fit in funjet.
3. Just leave it to the defaults for 4S setup. Later you can increase the timining mode (if available) to advanced. Remember you use a good BEC (castle or parkbec works well)
4. 70 +-5 amps.
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Old Jun 07, 2009, 06:47 PM
Formerly bUd~Fokker
vvV FANG Vvv's Avatar
Australia, NSW, Eurongilly
Joined Aug 2008
2,039 Posts
Quote:
Originally Posted by SeaComms
Trouble launching? Whats your power to weight ratio like? The only one I have seen flying was down the local field, and he hand launches at bit over 1/2 throttle and chucks it up at about 30 degrees. it never even dips down, just rockets up from there.

He is running an old Walkera 3000kv inrunner with a 6x4 APCe on 2200ma 3S. I think its a little over propped for a 3000kv motor personaly, but it gets the job done!

Oh, and he has no glass on his, so its probably a little lighter too.
Power to weight ration is good, I am using a 3200kv motor on 3S and a 4.7x4.2 prop, and the problem is the small props dont give that much thrust... great for high speed.... not so good for thrust! Craches happened using a 4.75x4,75 props.


Weight is just a little more than stock due to several coats of paint and some extra epoxy and cf tubes here and there.

Putts out around 430 watts on 3s. On 4S i might not have the same problem.

***
Gryphon, that's one crazy looking rig!! I do like how it has lots of clearance for the prop which is needed.

**

Twang I think I built mine after reading the same thread you did. I found the pic of yours and it does look great... do you have a Funjet too and have you ever used a dolly setup for it?
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Old Jun 07, 2009, 09:27 PM
Registered User
GryphonRCU's Avatar
United States, CA, SF
Joined Mar 2008
3,820 Posts
Well guys,

The day has arrived. The Stryker taking the speed record over a Funjet......in a level flight at that.

I know that will be short lived because with same power the Funjet can fly 20% faster or so.

It just takes good power using a sufficient prop size.

So to the Funjet kings: WAKE UP.

Expect 160 MPH in a Stryker soon.

Full details and proof in coming days.

Before anyone gets irritated; FACT: "Funjet is superior design for high speed"
There I said it first.

Now who is going to make high power using adequate prop size to transfer all of it in level flight????? With less power a Funjet can fly faster.


Yellow Sierra,
If you want my 28mm motor for a 2200-2400W Funjet pass, let me know.


Gryphon
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Old Jun 07, 2009, 10:54 PM
Great Britain
MrBen.'s Avatar
Joined Dec 2008
1,600 Posts
Quote:
Originally Posted by numb_thumb
2. absolutely. Buy GWS heatsinks and cut the fins off for a nice fit in funjet.
this one? http://www.brchobbies.co.uk/?page=sh...ditem&item=653
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Old Jun 08, 2009, 06:59 AM
Registered User
panzerd18's Avatar
Melbourne, Australia
Joined Dec 2005
827 Posts
I have the same power system as the guy in the youtube clip below.

I will run a 4.75x4.75 pylon prop.

Funjet HXT 2845 (380L) 2700kv 4s1p 2200mAh APC5.0x5.0 (5 min 28 sec)
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Old Jun 08, 2009, 11:31 AM
Registered User
Bay Area, CA
Joined Sep 2007
1,162 Posts
Quote:
Originally Posted by est1976
Not exactly...More like the one attached...

Any sink with smaller tooth like the one shown will fit into the funjet nicely....just remember to cut the two fins off using a dremel.
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