HobbyLab SR-71

HobbyLab SR-71

Post by Evan Ro » Sun, 19 Jul 1998 04:00:00



Does anyone know if this can be flown with either:

        A) A pair of 24mm reloadables

                or

        B) A single larger (29mm?) motor

-----
Evan Ross               NAR #
e v a n AT e r o s s DOT c o m
-----
This was posted from a temporary address, it will be changed once the spammers
lock on to it. Sorry, but it's a (spam) jungle out here.

 
 
 

HobbyLab SR-71

Post by The Silent Observe » Sun, 19 Jul 1998 04:00:00


Quote:

> Does anyone know if this can be flown with either:

>         A) A pair of 24mm reloadables

>                 or

>         B) A single larger (29mm?) motor

I'd have to recommend against the two-motor configuration in any SR-71
-- at least if you're planning to mount the motors in the scale jet
engine nacelles.  Putting the thrust lines that far off the center line
is a Very Bad Thing; the slightest dely in ignition of one motor will
lead to a unbalanced thrust throughout the flight (most reloads have a
slightly regressive thrust curve, so the motor that ignited first will
have less thrust than the late one), probably resulting in a power
prang.  That problem is made worse by the fact that the Hobby Lobby
glider doesn't have rudder control, so you have no way to compensate
during boost for the unbalanced thrust, even if your reflexes and flying
skills are up to the challenge (and they probably aren't, unless you've
got dozens of hours of stick time, at a minimum).

The single 29mm motor might be made to work, providing you rebalanced
the glider (to keep the same glide and boost CG locations with the
heavier motor), and stick to low-thrust motors like the F12 and E16.

To be honest, from what I've read (I've never seen one fly), the Hobby
Lobby SR-71 appears to be a grossly overpriced and underengineered
travesty.  You'd be much better off (IMO) using standard model airplane
techniques to build a frame-and-skin model of the same subject; you'd
get a final result that wouldn't be much (if any) heavier, but would be
a great deal more durable and likely less prone to creating its own
disasters.  You might even find it flew well enough to operate as a
rocket glider, instead of ejecting an internal pod as the Hobby Lobby
version does.

--
 WARNING!!  This area has been designated an official DOPE FREE ZONE!!

      If you're going to be a dope, please do it somewhere else!

Donald Qualls, aka The Silent Observer           NAR # 70141-SR Insured
Rocket Pages             http://members.aol.com/silntobsvr/launches.htm

Opinions expressed are my own -- take them for what they're worth
and don't expect them to be perfect.

 
 
 

HobbyLab SR-71

Post by Evan Ro » Sun, 19 Jul 1998 04:00:00



Quote:

>> Does anyone know if this can be flown with either:

>>         A) A pair of 24mm reloadables

>>                 or

>>         B) A single larger (29mm?) motor

>I'd have to recommend against the two-motor configuration in any SR-71
>-- at least if you're planning to mount the motors in the scale jet
>engine nacelles
>[snip]
>That problem is made worse by the fact that the Hobby Lobby
>glider doesn't have rudder control
>[snip]
>stick to low-thrust motors like the F12 and E16.

>To be honest, from what I've read (I've never seen one fly), the Hobby
>Lobby SR-71 appears to be a grossly overpriced and underengineered
>travesty

Thanks for your input, but I'm not looking for supposition or guesses. I was
hoping to get information from someone who has actually seen and preferably
flown one of these.

Also, it's not Hobby Lobby, it's HobbyLab, and the picture
(http://www.sr-71.com/) clearly shows a center mounted engine configuration

-----
Evan Ross               NAR #73462
e v a n AT e r o s s DOT c o m
-----
This was posted from a temporary address, it will be changed once the spammers
lock on to it. Sorry, but it's a (spam) jungle out here.

 
 
 

HobbyLab SR-71

Post by Chri » Sun, 19 Jul 1998 04:00:00


well I have this RC SR-71 from hobby lobby

$200 for an RC Blackbird is better than the next step $2000 ducted fan model
:-)

I will report any info I gather on it first flight which should be next
sunday (would fly tommorrow but I am going 4Wheeling :-)

Chris
http://www.nerys.com/rocketry/

Quote:




>>> Does anyone know if this can be flown with either:

>>>         A) A pair of 24mm reloadables

>>>                 or

>>>         B) A single larger (29mm?) motor

>>I'd have to recommend against the two-motor configuration in any SR-71
>>-- at least if you're planning to mount the motors in the scale jet
>>engine nacelles
>>[snip]
>>That problem is made worse by the fact that the Hobby Lobby
>>glider doesn't have rudder control
>>[snip]
>>stick to low-thrust motors like the F12 and E16.

>>To be honest, from what I've read (I've never seen one fly), the Hobby
>>Lobby SR-71 appears to be a grossly overpriced and underengineered
>>travesty

>Thanks for your input, but I'm not looking for supposition or guesses. I
was
>hoping to get information from someone who has actually seen and preferably
>flown one of these.

>Also, it's not Hobby Lobby, it's HobbyLab, and the picture
>(http://www.sr-71.com/) clearly shows a center mounted engine configuration

>-----
>Evan Ross NAR #73462
>e v a n AT e r o s s DOT c o m
>-----
>This was posted from a temporary address, it will be changed once the
spammers
>lock on to it. Sorry, but it's a (spam) jungle out here.

 
 
 

HobbyLab SR-71

Post by Anthony M. Coope » Mon, 20 Jul 1998 04:00:00


If you would like to see one fly check out the second SR-71 video on
http://www.2xtreme.net/AMCooper/rockets/movies/movies.html The current Hobby Labs does not eject the
pod.
Quote:


> > Does anyone know if this can be flown with either:

> >         A) A pair of 24mm reloadables

> >                 or

> >         B) A single larger (29mm?) motor

> I'd have to recommend against the two-motor configuration in any SR-71
> -- at least if you're planning to mount the motors in the scale jet
> engine nacelles.  Putting the thrust lines that far off the center line
> is a Very Bad Thing; the slightest dely in ignition of one motor will
> lead to a unbalanced thrust throughout the flight (most reloads have a
> slightly regressive thrust curve, so the motor that ignited first will
> have less thrust than the late one), probably resulting in a power
> prang.  That problem is made worse by the fact that the Hobby Lobby
> glider doesn't have rudder control, so you have no way to compensate
> during boost for the unbalanced thrust, even if your reflexes and flying
> skills are up to the challenge (and they probably aren't, unless you've
> got dozens of hours of stick time, at a minimum).

> The single 29mm motor might be made to work, providing you rebalanced
> the glider (to keep the same glide and boost CG locations with the
> heavier motor), and stick to low-thrust motors like the F12 and E16.

> To be honest, from what I've read (I've never seen one fly), the Hobby
> Lobby SR-71 appears to be a grossly overpriced and underengineered
> travesty.  You'd be much better off (IMO) using standard model airplane
> techniques to build a frame-and-skin model of the same subject; you'd
> get a final result that wouldn't be much (if any) heavier, but would be
> a great deal more durable and likely less prone to creating its own
> disasters.  You might even find it flew well enough to operate as a
> rocket glider, instead of ejecting an internal pod as the Hobby Lobby
> version does.

> --
>  WARNING!!  This area has been designated an official DOPE FREE ZONE!!

>       If you're going to be a dope, please do it somewhere else!

> Donald Qualls, aka The Silent Observer           NAR # 70141-SR Insured
> Rocket Pages             http://members.aol.com/silntobsvr/launches.htm

> Opinions expressed are my own -- take them for what they're worth
> and don't expect them to be perfect.

 
 
 

HobbyLab SR-71

Post by Anthony M. Coope » Mon, 20 Jul 1998 04:00:00


Also available at http://www.sellontv.com/sr-71.html
Quote:



> >> Does anyone know if this can be flown with either:

> >>         A) A pair of 24mm reloadables

> >>                 or

> >>         B) A single larger (29mm?) motor

> >I'd have to recommend against the two-motor configuration in any SR-71
> >-- at least if you're planning to mount the motors in the scale jet
> >engine nacelles
> >[snip]
> >That problem is made worse by the fact that the Hobby Lobby
> >glider doesn't have rudder control
> >[snip]
> >stick to low-thrust motors like the F12 and E16.

> >To be honest, from what I've read (I've never seen one fly), the Hobby
> >Lobby SR-71 appears to be a grossly overpriced and underengineered
> >travesty

> Thanks for your input, but I'm not looking for supposition or guesses. I was
> hoping to get information from someone who has actually seen and preferably
> flown one of these.

> Also, it's not Hobby Lobby, it's HobbyLab, and the picture
> (http://www.sr-71.com/) clearly shows a center mounted engine configuration

> -----
> Evan Ross               NAR #73462
> e v a n AT e r o s s DOT c o m
> -----
> This was posted from a temporary address, it will be changed once the spammers
> lock on to it. Sorry, but it's a (spam) jungle out here.

 
 
 

HobbyLab SR-71

Post by Chri » Tue, 21 Jul 1998 04:00:00


Heh that auora is a SR-75 penetrator Model from Testors !

COOL

is it RC ?

Chris
http://www.nerys.com/rocketry/

Quote:

>If you would like to see one fly check out the second SR-71 video on
>http://www.2xtreme.net/AMCooper/rockets/movies/movies.html The current

Hobby Labs does not eject the
Quote:
>pod.



>> > Does anyone know if this can be flown with either:

>> >         A) A pair of 24mm reloadables

>> >                 or

>> >         B) A single larger (29mm?) motor

>> I'd have to recommend against the two-motor configuration in any SR-71
>> -- at least if you're planning to mount the motors in the scale jet
>> engine nacelles.  Putting the thrust lines that far off the center line
>> is a Very Bad Thing; the slightest dely in ignition of one motor will
>> lead to a unbalanced thrust throughout the flight (most reloads have a
>> slightly regressive thrust curve, so the motor that ignited first will
>> have less thrust than the late one), probably resulting in a power
>> prang.  That problem is made worse by the fact that the Hobby Lobby
>> glider doesn't have rudder control, so you have no way to compensate
>> during boost for the unbalanced thrust, even if your reflexes and flying
>> skills are up to the challenge (and they probably aren't, unless you've
>> got dozens of hours of stick time, at a minimum).

>> The single 29mm motor might be made to work, providing you rebalanced
>> the glider (to keep the same glide and boost CG locations with the
>> heavier motor), and stick to low-thrust motors like the F12 and E16.

>> To be honest, from what I've read (I've never seen one fly), the Hobby
>> Lobby SR-71 appears to be a grossly overpriced and underengineered
>> travesty.  You'd be much better off (IMO) using standard model airplane
>> techniques to build a frame-and-skin model of the same subject; you'd
>> get a final result that wouldn't be much (if any) heavier, but would be
>> a great deal more durable and likely less prone to creating its own
>> disasters.  You might even find it flew well enough to operate as a
>> rocket glider, instead of ejecting an internal pod as the Hobby Lobby
>> version does.

>> --
>>  WARNING!!  This area has been designated an official DOPE FREE ZONE!!

>>       If you're going to be a dope, please do it somewhere else!

>> Donald Qualls, aka The Silent Observer           NAR # 70141-SR Insured
>> Rocket Pages             http://members.aol.com/silntobsvr/launches.htm

>> Opinions expressed are my own -- take them for what they're worth
>> and don't expect them to be perfect.

 
 
 

HobbyLab SR-71

Post by Chri » Wed, 22 Jul 1998 04:00:00


It doesnt eject a pod ???

What plane are you talking about ??

Chris
http://www.nerys.com/rocketry/

Quote:


>> Does anyone know if this can be flown with either:

>>         A) A pair of 24mm reloadables

>>                 or

>>         B) A single larger (29mm?) motor

>I'd have to recommend against the two-motor configuration in any SR-71
>-- at least if you're planning to mount the motors in the scale jet
>engine nacelles.  Putting the thrust lines that far off the center line
>is a Very Bad Thing; the slightest dely in ignition of one motor will
>lead to a unbalanced thrust throughout the flight (most reloads have a
>slightly regressive thrust curve, so the motor that ignited first will
>have less thrust than the late one), probably resulting in a power
>prang.  That problem is made worse by the fact that the Hobby Lobby
>glider doesn't have rudder control, so you have no way to compensate
>during boost for the unbalanced thrust, even if your reflexes and flying
>skills are up to the challenge (and they probably aren't, unless you've
>got dozens of hours of stick time, at a minimum).

>The single 29mm motor might be made to work, providing you rebalanced
>the glider (to keep the same glide and boost CG locations with the
>heavier motor), and stick to low-thrust motors like the F12 and E16.

>To be honest, from what I've read (I've never seen one fly), the Hobby
>Lobby SR-71 appears to be a grossly overpriced and underengineered
>travesty.  You'd be much better off (IMO) using standard model airplane
>techniques to build a frame-and-skin model of the same subject; you'd
>get a final result that wouldn't be much (if any) heavier, but would be
>a great deal more durable and likely less prone to creating its own
>disasters.  You might even find it flew well enough to operate as a
>rocket glider, instead of ejecting an internal pod as the Hobby Lobby
>version does.

>--
> WARNING!!  This area has been designated an official DOPE FREE ZONE!!

>      If you're going to be a dope, please do it somewhere else!

>Donald Qualls, aka The Silent Observer           NAR # 70141-SR Insured
>Rocket Pages             http://members.aol.com/silntobsvr/launches.htm

>Opinions expressed are my own -- take them for what they're worth
>and don't expect them to be perfect.